Appendix 1 – Water Resource Zone Summaries

Home , Afon Leri, Arenig Fawr, Beacons Reservoir, Cantref Reservoir, Efailnewydd, Llyn Cefni

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Contents

Appendix 1 – Water Resource Zone Summaries ...... 1 Contents ...... 2 Figures ...... 9 Location Plans ...... 10 Tables ...... 11 North Eryri/ Ynys Mon - 8001 ...... 1 North Eryri/ Ynys Mon Water Resources ...... 2 Current Resource Status ...... 2 Drought Actions – Sequence of Events ...... 4 Drought Management Options - Supply Side ...... 6 8001.D1 - Transfer water from Crug abstraction point to Cwellyn WTW ...... Error! Bookmark not defined. 8001.D2 - Removal of Llyn Cwellyn 10 Ml/d abstraction limit...... 6 8001.D3 - Reduction of Alaw Compensation water to 1.7 Ml/d ...... 8 8001.D4 - Reduction of Ffynnon Llugwy Compensation water ...... 10 8001.D5 - Reduction of Cefni Reservoir Compensation water ...... 12 8001.D6 - Transfer of water from Marchlyn Mawr (the Dinorwig System) to Marchlyn Bach ...... 14 8001.D7 - Pumped abstraction from Llyn Cwellyn below the gravity intake level (requires installation of temporary pumps and infrastructure) 15 Clwyd Coastal - 8012 ...... 21 Clwyd Coastal Water Resources ...... 22 Current Resource Status ...... 22 Drought Actions – Sequence of Events ...... 24 Drought Management Options - Supply Side ...... 26 8012.D1 - Transfer water from Llyn Bran to Afon Aled ...... 26 8012.D2 - Reduction of the compensation release from Aled Isaf and modification of the Hands Off Flow value at Bryn Aled ...... 28 8012.D3 - Pump water from Llyn Aled ‘dead’ storage ...... 30 8012.D4 - Relaxation of the annual licences on Afon Aled and the Plas Uchaf and Dolwen reservoirs ...... 32 8012.D5 - Relaxation of the Llannerch boreholes annual licence ...... 33 8012.D6 - Pumped (winter) refill from Aled Isaf to Llyn Aled ...... 35 Alwen Dee - 8014 ...... 38 Alwen/ Dee Water Resources...... 39 Current Resource Status ...... 39

Dee General Directions ...... 39 Drought Actions – Sequence of Events ...... 41 Drought Management Options – Supply Side ...... 44 8014.D1 - Cutback in Compensation release from Alwen Reservoir ...... 44 8014.D2 - Utilisation of Llwyn Isaf with temporary WTW ...... 45 8014.D3 - Bretton Pumpback ...... 46 8014.D4 - Reinstate Llyn Bran with temporary WTW ...... 47 8014.D5 - Utilisation of Cilcain Reservoirs ...... 49 Bala - 8020 ...... 52 Bala Water Resources ...... 53 Current Resource Status ...... 53 Drought Actions – Sequence of Events ...... 54 Drought Management Options – Supply Side ...... 57 8020.D1 - Llyn Arenig Fawr: Relaxation of daily licence conditions and mobilisation of temporary water treatment plant ...... 57 8020.D2 - Transfer of water from Llyn Conwy system (Dyffryn Conwy WRZ)...... 60 Tywyn Aberdyfi – 8021 ...... 62 Tywyn – Aberdyfi Water Resources ...... 63 Current Resource Status ...... 63 Drought Actions – Sequence of Events ...... 64 Drought Management Options...... 66 8021.D1 - New abstraction (tankering) from Afon Dysynni at Pont y Garth (to Pen y Bont WTW)...... 66 8021.D2 - Relaxation of annual licences on the Afon Fathew and the Nant Braich Y Rhiw ...... 68 Blaenau Ffestiniog - 8026...... 69 Blaenau Ffestiniog Water Resources ...... 70 Current Resource Status ...... 70 Drought Actions – Sequence of Events ...... 71 Drought Management Options - Supply Side ...... 73 8026.D1 - Pumped abstraction of Dead Storage from Llyn Morwynion, and increase annual abstraction licence to fully utilise Emergency Storage volume ...... 73 Barmouth - 8033 ...... 77 Barmouth Water Resources ...... 78 Current Resource Status ...... 78 Drought Actions – Sequence of Events ...... 79 Drought Management Options – Supply Side ...... 81 8033.D1 - Pumped abstraction of Dead Storage from Llyn Bodlyn ...... 81

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8033.D2 - Reduce compensation water releases from Llyn Bodlyn ...... 83 Lleyn Harlech - 8034 ...... 86 Lleyn/ Harlech Water Resources ...... 87 Current Resource Status ...... 87 Drought Actions – Sequence of Events ...... 88 Drought Management Options - Supply Side ...... 90 8034.D1 - Reduce compensation flow releases from Llyn Cwmystradllyn ...... 90 8034.D2 - Reduce regulation releases from Llyn Cwmstradllyn...... 92 8034.D3 - Extension of the siphon arrangement to exploit the Dead Storage in Llyn Tecwyn ...... 94 Dyffryn Conwy - 8035 ...... 97 Dyffryn Conwy Water Resources ...... 98 Current Resource Status ...... 98 Drought Actions - Sequence of Events ...... 99 Drought Management Options - Supply Side ...... 101 8035.D1 - Increase the annual abstraction licence quantity from Llyn Cowlyd ...... 101 South Meirionnydd - 8036 ...... 105 South Meirionnydd Water Resources ...... 106 Current Resource Status ...... 106 Drought Actions – Sequence of Events ...... 108 Drought Management Options - Supply Side ...... 110 8036.D1 - Increase abstraction from Llyn Cynwch to Penycefn WTW to support tankering to outlying source areas ...... 110 Ross on Wye - 8101 ...... 114 Ross-on-Wye Water Resources ...... 115 Current Resource Status ...... 115 Drought Actions – Sequence of Events ...... 117 Drought Management Options – Supply Side ...... 119 8101.D1 - Exchange of spare Wye Regulation water to Severn Trent’s Lydbrook abstraction point ...... 119 8101.D2 - Reinstate Alton Court ...... 121 Elan Builth - 8102 ...... 123 Elan/ Builth Water Resources ...... 124 Current Resource Status ...... 124 Elan Reservoirs Operation ...... 125 Drought Actions – Sequence of events ...... 127 Drought Management Options - Supply Side ...... 129

8102.D1 - Increase the authorized abstraction at Builth Wells by 1.0 Ml/d and provide additional temporary treatment capacity ...... 129 Hereford CU Area – 8103 ...... 132 Hereford Conjunctive Use Water Resources ...... 133 Current Resource Status ...... 133 Drought Actions – Sequence of Events ...... 135 Drought Management Options - Supply Side ...... 137 8103.D1 - Increase the abstraction at Broomy Hill by 3 Ml/d ...... 137 8103.D2 - Increase the abstraction at Leintwardine by 0.1 Ml/d ...... 139 Llyswen - 8105 ...... 142 Llyswen Water Resources ...... 143 Current Resource Status ...... 143 Drought Actions – Sequence of Events ...... 145 Supply side options ...... 148 8105.D1 - Increase the abstraction at Llyswen ...... 148 Monmouth - 8106 ...... 150 Monmouth Water Resources ...... 151 Current Resource Status ...... 151 Drought Actions – Sequence of Events ...... 153 Pilleth - 8107 ...... 155 Pilleth Water Resources ...... 156 Current Resource Status ...... 156 Drought Actions – Sequence of Events ...... 158 Drought Management Options – Supply Side ...... 160 8107.D1 - Increase the authorised Pilleth abstraction ...... 160 Brecon Portis - 8108 ...... 162 Brecon/ Portis Water Resources ...... 163 Current Resource Status ...... 163 Drought Actions – Sequence of Events ...... 165 Drought Management Options – Supply Side ...... 168 8108.D1 - Further reduce Usk Compensation discharge, removal of the residual flow requirement for Trinant abstraction, removal of the residual flow requirement for Nant Henwaun abstraction ...... 168 Vowchurch - 8110 ...... 170 Vowchurch Water Resources ...... 171 Current Resource Status ...... 171 Drought Actions – Sequence of Events ...... 173

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Drought Management Options –Supply Side ...... 175 8110.D1 - Removal of flow condition on the Rive Dore ...... 175 Whitbourne - 8111 ...... 177 Whitbourne Water Resources...... 178 Current Resource Status ...... 178 Drought Actions – Sequence of Events ...... 179 Drought Management Options - Supply Side ...... 181 8111.D1 - Removal of flow condition on the River Teme ...... 181 South East Wales Conjenctive Use System (SEWCUS) - 8121 ...... 183 SEWCUS Water Resources ...... 184 Current Resource Status ...... 184 Drought Actions – Sequence of events ...... 186 SEWCUS – Cynon – 8113 ...... 189 Cynon Water Resources ...... 190 Current Resource Status ...... 190 Drought Actions – Sequence of Events ...... 192 Drought Management Options –Supply Side ...... 194 8113.D1 - Removal of flow condition on the River Dare at Bwllfa Dare ...... 194 SEWCUS - Llwynon / Sluvad / Court Farm – 8109 ...... 196 Llwynon/ Sluvad/ Court Farm Water Resources ...... 197 Current Resource Status ...... 197 Drought Actions – Sequence of Events ...... 199 Supply side options ...... 201 8109.D1 - Reduce compensation water releases from Llwynon Reservoir ...... 201 8109.D2 - Unsupported abstractions from the River Usk at Prioress Mill ...... 203 8109.D3 - Unsupported abstractions from the Riverv Wye at Monmouth ...... 205 8109.D4 - Emergency abstraction from the Afon Lwyd at New Inn ...... 207 8109.D5 - Re-commissioning of Ynys y Fro WTW using Pant Yr Eos and Ynys y Fro Reservoirs ...... 210 8109.D6 - Use Grwyne Reservour, as a regulating reservoir, to support abstractions at Prioress Mill or Llantrisant ...... 212 8109.D7 - Utilise Grwyne Reservoir for direct supply ...... 214 8109.D8 - Reduce the compensation water releases from the Elan Reservoirs ...... 215 SEWCUS – Pontsticill High Level - 8119 ...... 217 Pontsticill High Level Water Resources ...... 218 Current Resource Status ...... 218

Drought Actions – Sequence of Events ...... 219 Drought Management Options - Supply Side ...... 222 8119.D1 - Compensation Water Reduction of 50% at Pontsticill Reservoir ...... 222 8119.D2 - Compensation Water Reduction of 50% at Lower Carno Reservoir ...... 224 SEWCUS - Ponsticill Low Level - 8120 ...... 226 Pontsticill Low Level Water Resources ...... 227 Current Resource Status ...... 227 Drought Actions – Sequence of Events ...... 228 SEWCUS – Rhondda - 8112 ...... 230 Rhondda Water Resources ...... 231 Current Resource Status ...... 231 Drought Actions – Sequence of Events ...... 233 Drought Management Options - Supply Side ...... 235 8112.D1 - Emergency Abstraction from the River Rhondda at Treherbert ...... 235 SEWCUS – Talybont - 8116...... 238 Talybont Water Resources ...... 239 Current Resource Status ...... 239 Drought Actions – Sequence of Events ...... 240 Drought Management Options - Supply Side ...... 242 8116.D1 - Further reduction in Talybont Compensation Water release and reduction in Nant Clydach residual flow ...... 242 8116.D2 - Reduction in the Cwmtillery Reservoir Compensation Water Release ...... 245 8116.D3 - Utilise the Dead Storage in Talybont Reservoir ...... 247 Tywi Conjunctive Use System - 8201 ...... 249 Tywi Conjunctive Use Water Resources ...... 250 Current Resource Status ...... 250 Drought Actions – Sequence of Events ...... 253 Drought Management Options – Supply Side ...... 255 8201.D1 - Reduce Crai compensation flow by 50% ...... 255 8201.D2 - Reduce Ystradfellte compensation flow by 50% ...... 257 8201.D3 - Remove the maintained flow requirement below the Nantgaredig intake on the River Tywi ...... 259 8201.D4 - Reduce Brianne compensation flow by 50% ...... 261 8201.D5 - Utilise the Upper and Lower Liedi reservoirs for potable supplies ...... 263 8201.D6 - Reinstate Schwyll source and treatment works ...... 264 Mid and South Ceredigion - 8202 ...... 268

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Mid & South Ceredigion Water Resources ...... 269 Current Resource Status ...... 269 Drought Actions – Sequence of Events ...... 270 Drought Management Options – Supply Side ...... 273 8202.D1 - Increase the Llechryd abstraction from 19 Ml/d to 21 Ml/d and obtain variation of annual licence amounts ...... 273 8202.D2 - Increase the Teifi Pools annual abstraction licence to fully utilise the Emergency Storage volume ... 275 North Ceredigion - 8203 ...... 278 North Ceredigion Water Resources ...... 279 Current Resource Status ...... 279 Drought Actions – Sequence of Events ...... 280 Drought Management Options - Supply Side ...... 282 8203.D1 - Increase the annual abstraction quantity from Llyn Llygad Rheidol...... 282 8203.D2 – Pumped Abstraction from Nantymoch (an HEP reservoir) into the raw water main between Llyn Llygad Rheidol Reservoir and Bontgoch WTW ...... 285 8203.D3 - Reduce the compensation release from Llwn Craig Y Pistyll by 50% ...... 287 Pembrokeshire - 8206 ...... 289 Pembrokeshire Water Resources ...... 290 Current Resource Status ...... 290 Drought Actions – Sequence of Events ...... 292 Drought Management Options - Supply Side ...... 294 8206.D1 - Reduce the required prescribed flow below the Crowhill Abstraction ...... 294 8206.D2 - Reduce the Compensation release from Preseli Reservoir by 50% ...... 296 8206.D3 - Increase the direct abstraction from Llys y Fran Reservoir and remove the Section 158 restrictions, if applicable ...... 298 8206.D4 - Reduce the prescribed flow required at the Pont Hywel abstraction ...... 300 8206.D5 - Abstraction from the Afon Taf ...... 301 8206.D6 - Reduction in the statutory compensation release from Llys y Fran Reservoir to the Afon Syfynwy of 7.64 Ml/d from 13.64 Ml/d to 6 Ml/d ...... 303

Figures

Figure 1 - Llyn Cwellyn Reservoir Storage ...... 17 Figure 2 - Ffynnon Llugwy Drought Action Zones ...... 18 Figure 3 - Llyn Alaw Drought Action Zones ...... 19 Figure 4 - Llyn Cefni Drought Action Zones ...... 20 Figure 5 - Llyn Aled and Aled Isaf Combined Drought Action Zones ...... 37 Figure 6 - Llyn Alwen Drought Action Zones ...... 51 Figure 7- Llyn Arenig Fawr Drought Action Zones ...... 61 Figure 8 - Tywyn Aberdyfi Drought Action Zones ...... 63 Figure 9- Llyn Morwynion Drought Action Zones ...... 76 Figure 10 - Llyn Bodlyn Drought Action Zones ...... 85 Figure 11 - Combined Llyn Cwmstradllyn and Llyn Tecwyn Uchaf Drought Action Zones ...... 96 Figure 12 - Llyn Cowlyd Drought Action Zones ...... 103 Figure 13 - Llyn Conwy Drought Action Zones ...... 104 Figure 14 - Llyn Cynwch Drought Action Zones ...... 113 Figure 15- Ross on Wye Drought Action Zones ...... 116 Figure 16 - Elan Builth Drought Action Zones ...... 126 Figure 17 - Elan Reservoirs Operating Rule Curves ...... 131 Figure 18 - Hereford CUS Drought Action Zones ...... 134 Figure 19 - Hereford CUS Drought Actions Sequence of Events ...... 136 Figure 20 - Llyswen Drought Action Zones ...... 144 Figure 21 - Monmouth Drought Action Zones ...... 152 Figure 22 - Pilleth Drought Action Zones ...... 157 Figure 23 - Pilleth Drought Action Sequence of Events ...... 159 Figure 24 - Vowchurch Drought Action Zones...... 172 Figure 25 – SEWCUS ‘Big 5’ Drought Action Zones ...... 188 Figure 26 - Ystradfellte Reservoir Drought Action Zones ...... 266 Figure 27 – Llyn Brianne Drought Action Zones ...... 267 Figure 28 - Teifi Pools Drought Action Zones ...... 277 Figure 29 – Craig y Pistyll and Llygad Rheidol Combined Drought Action Zones ...... 288 Figure 30 - Llys y Fran Drought Action Zones ...... 306 Figure 31 - Preselli Reservoir Drought Action Zones ...... 307

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Location Plans

Location Plan 1 - North Eryri/ Ynys Mon Water Resource Zone ...... 1 Location Plan 2 - Clwyd Coastal Water Resource Zone ...... 21 Location Plan 3 - Alwen Dee Water Resource Zone ...... 38 Location Plan 4 - Bala Water Resource Zone ...... 52 Location Plan 5 - Tywyn/ Aberdyfi Water Resource Zone ...... 62 Location Plan 6 - Blaenau Ffestiniog Water Resource Zone ...... 69 Location Plan 7 - Barmouth Water Resource Zone ...... 77 Location Plan 8 - Lleyn/ Harlech Water Resource Zone ...... 86 Location Plan 9 - Dyffryn Conwy Water Resource Zone ...... 97 Location Plan 10- South Meirionnydd Water Resource Zone ...... 105 Location Plan 11- Ross-on-Wye Water Resource Zone ...... 114 Location Plan 12- Elan / Builth Water Resource Zone ...... 123 Location Plan 13 - Hereford Conjunctive Use Water Resource Zone ...... 132 Location Plan 14 - Llyswen Water Resource Zone ...... 142 Location Plan 15 - Monmouth Water Resource Zone ...... 150 Location Plan 16 - Pilleth Water Resource Zone...... 155 Location Plan 18 - Brecon Portis Water Resource Zone ...... 162 Location Plan 19 - Vowchurch Water Resource Zone ...... 170 Location Plan 20 - Whitbourne Water Resource Zone ...... 177 Location Plan 21 - SEWCUS Water Resource Zone...... 183 Location Plan 22 - Cynon Area ...... 189 Location Plan 23 - Llwynon / Sluvad / Court Farm area ...... 196 Location Plan 24 - Ponsticill High Level Water Reseource Zone ...... 217 Location Plan 25 - Pontsticill Low Level Water Resource Zone ...... 226 Location Plan 26 - Rhondda Water Resources Zone ...... 230 Location Plan 27 - Talybont Water Resource Zone...... 238 Location Plan 28- Tywi CUS Water Resource Zone ...... 249 Location Plan 29 - Mid and South Ceredigion Water Resource Zone ...... 268 Location Plan 30 - North Ceredigion Water Resource Zone ...... 278 Location Plan 31 - Pembrokeshire Water Resources Zone ...... 289

Tables

Table 1 - North Eryri/ Ynys Mon abstraction licences ...... 2 Table 2 – North Eryri Ynys Mon Drought Actions Sequence of Events ...... 5 Table 3 - Clwyd Coastal abstraction licences ...... 22 Table 4 - Drought Actions for Clwyd Coastal WRZ ...... 25 Table 5 - Alwen/ Dee abstraction licences ...... 39 Table 6 - Alwen Dee Drought Actions Sequence of Events ...... 43 Table 7 - Bala abstraction licences ...... 53 Table 8 - Bala Drought Actions Sequence of Events ...... 56 Table 9- Tywyn/ Aberdyfi abstraction licences ...... 63 Table 10 - Blaenau Ffestiniog abstraction licences ...... 70 Table 11 - Blaenau Ffestiniog Drought Actionas Sequence of Events ...... 72 Table 12 - Barmouth abstraction licences ...... 78 Table 13 - Barmouth Drought Actions Sequence of Events ...... 80 Table 14 - Lleyn/ Harlech abstraction licences ...... 87 Table 15 - Lleyn-Harlech Drought Action Sequence of Events ...... 89 Table 16 - Dyffryn Conwy abstraction licences ...... 98 Table 17 - Dyffryn Conwy Drought Actions Sequence of Events ...... 100 Table 18- South Meirionnydd abstraction licences ...... 106 Table 19 - South Meirionnydd Drought Actions Sequence of Events ...... 109 Table 20- Ross-on-Wye abstraction licences ...... 115 Table 21 - Drought Actions for Ross-on-Wye WRZ ...... 118 Table 22 - Elan/ Builth abstraction licences ...... 124 Table 23 - Elan Built Drought Action Sequence of Events ...... 128 Table 24 - Hereford Conjunctive Use abstraction licences ...... 133 Table 25 - Llyswen abstraction licences ...... 143 Table 26 - Llywen Drought Action Sequence of Events ...... 147 Table 27- Monmouth Abstraction Licences ...... 151 Table 28 - Monmouth Drought Action Sequence of Events ...... 154 Table 29 - Pilleth Abstraction Licences ...... 156 Table 30 - Brecon Portis Abstraction Licences ...... 163 Table 31 - Brecon Portis Drought Action Zones ...... 164 Table 32 - Brecon Portis Drought Actions Sequence of Events ...... 167 Table 33 - Vowchurch abstraction licences ...... 171 Table 34 - Drought Actions for Vowchurch WRZ...... 174 Table 35 - Whitbourne Abstraction Licences ...... 178 Table 36 - Whitbourne Drought Actions Sequence of Events ...... 180 Table 37 - SEWCUS Abstraction licences ...... 184 Table 38 - SEWCUS Drought Actions Sequence of Events ...... 187 Table 39 - Cynon Abstraction Licences ...... 190 Table 40 - Cynon Drought Actions Sequence of Events ...... 193 Table 41 - Llwynon / Sluvad / Court Farm Abstraction Licences ...... 197 Table 42 - Llwynon/ Sluvad/ Court Farm - Drought Action Sequence of Events ...... 200 Table 43 - Pontsticill High Level Abstraction Licences ...... 218 Table 44 - Pontsticill High Level Area Drought Actions Sequence of Events ...... 221 Table 45 - Pontsticill Low Level Abstraction Licences ...... 227

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Table 46 - Pontsticill Low Level Drought Actions Sequence of Events ...... 229 Table 47- Rhondda Abstraction Licences ...... 231 Table 48 - Rhondda Drought Actions Sequence of Events ...... 234 Table 49 - Talybont Abstraction Licences ...... 239 Table 50 - Talybont Drought Action Sequence of Events ...... 241 Table 51 - Tywi CUS Abstraction Licences ...... 250 Table 52 - Tywi CUS Drought Actions Sequence of Events ...... 254 Table 53 - Mid and South Ceredigion Abstraction Licences ...... 269 Table 54 - Mid and South Ceredigion Drought Actions Sequence of Events ...... 272 Table 55 - North Ceredigion Abstraction Licences ...... 279 Table 56 - North Ceredigion Drought Actions Sequence of Events...... 281 Table 57 - Pembrokeshire Abstraction Licences ...... 290 Table 58 - Pembrokeshire Drought Action Sequence of Events ...... 293 P a g e | 1

North Eryri/ Ynys Mon - 8001

Location Plan 1 - North Eryri/ Ynys Mon Water Resource Zone

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North Eryri/ Ynys Mon Water Resources

No. Location Licence No. Type 1 Llyn Cwellyn 23/65/15/0024 Impounding Reservoir 2 Llyn Marchlyn Bach 23/65/16/0064 Impounding Reservoir 3 Ffynnon Llugwy 23/66/08/0010 Impounding Reservoir 4 Alaw Reservoir 23/102/06/0006 Impounding Reservoir 5 Cefni Reservoir 23/102/02/0007 Impounding Reservoir 6 Afon Rhythallt 23/65/16/0009 River Abstraction – Gravity 7 Pistyll Dwr Oer 23/65/16/0063 Spring Table 1 - North Eryri/ Ynys Mon abstraction licences

The location of the WRZ is shown on the Welsh Water Area map and the locations of the resources are shown in Location Plan 1. DCL’s have been defined for Llyn Cwellyn, Ffynnon Llugwy, Llyn Alaw and Llyn Cefni Reservoirs, as shown in Figure 1, Figure 2, Figure 3 and Figure 4 and drought actions are given in Table 2. Current Resource Status The area covered by this WRZ includes the mainland area adjacent to the Menai Straits (North Eryri) and Ynys Mon. The resources are operated conjunctively with the ability to feed water from the mainland to parts of the island from the gravity resources of Cwellyn, Ffynnon Llugwy and Llyn Marchlyn Bach when storage allows. As storage declines, the area of Ynys Mon supported from the mainland is reduced and the area supported by Alaw and Cefni increases. This method makes use of the sustainable gravity sources when they are available and reduces the amount of pumping required across the island. The operation of Llyn Cwellyn is constrained by the following existing licence conditions: the quantities that can be abstracted at different times of the year are dependent on different storage levels the amount of compensation water varies through the year and with different storage levels the amount of water reserved for freshet releases varies through the year and with different storage levels. Furthermore, the abstraction licence conditions constrain the use of Llyn Cwellyn to the uppermost 1600 Ml of the lake storage. The total capacity of the lake is approximately 16,000 Ml. The river channel of the Afon Gwyrfai, downstream of Llyn Cwellyn, and Llyn Cwellyn itself are both designated SACs. The rivers flowing out of Cefni Reservoir and Ffynnon Llugwy flow through areas designated as a SSSI. The Afon Gwyrfai and Llyn Cwellyn have been subject to the Review of Consents process undertaken by the Natural Resources Wales to meet their obligations under the EU Habitats Directive. The assessment considered the river flow requirements needed to support the designated species and the potential P a g e | 3

impact from our operations. The NRW have concluded ‘no adverse affect’ from our current operations though both parties are currently agreeing a possible alteration required to the fish pass at the Llyn Cwellyn outflow. During 2012/2013 the average demand in this WRZ was 37.04 Ml/d and the peak week demand was 41.37 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction to remain within licensed amount, Use the water that you need but please don’t waste it levels. within its operational rules and within the quality General Water Efficiency Campaigns via: constraints Ongoing leakage maintenance and water efficiency work - Radio streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ and ‘Enhanced - Water Efficiency Web Page Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison with operational Use what you need but please don’t waste water. Drought water conservation measures through the established colleagues and NRW in line with Management We increasingly need your help to conserve water media campaigns as per the communication plan which and Communications Plan. supplies. will include requests for voluntary restraint. Review and implement where feasible tankering We are also doing our bit by ensuring we fix leaks quickly Progress ‘Media Campaigns with Water Efficiency Device to support lower resource and/ or from to prevent waste Offering’ option neighbouring zone Continuation of Normal Activities plus Enhanced targeted Undertake ‘Enhanced Leakage Management’ option Preparation for supply–side options 8001.D6 & Water Efficiency Messaging via: 8001.D7 Supply / demand situation continually monitored - Local Radio throughout the drought situation and the effectiveness of demand-side measures. - Target social media Continuation of preceding options. - Prepare and Publish DCWW Drought Web Page Preplanning for the implementation of TUBs and NEUBs. TUB consultation via Printed media Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources We’ve introduced a temporary hosepipe ban as a last demand-side measures to be included in media resort to help conserve water supplies Welsh Water Executive to consider all supply side campaign and as aligned with the communication plan.) options 8001.D2 – D7 Ask you to respect this to ensure supplies to people in Introduction of TUBs (Saving of 0 – 5% demand, 0 – 1.85 the area are conserved Implement environmental monitoring in line with Ml/d). EMP Thank you in advance for your cooperation Continuation of preceding options. Review current operational activities to preserve Implement TUBS Preplanning for the implementation of NEUBs. resource Continuation of Previous Techniques plus Enhanced Continue to review and implement where feasible messaging via: tankering to support lower resource and/ or from P a g e | 5

neighbouring zone - Local Radio Prepare Drought Order/ Permit applications - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Drought Continuation of preceding options. Drought Order/ Permit solutions would be sought Continuation of Previous Activities with the enhanced for supply side options 8001.D2 - D7 message Increasing public awareness and content of new demand-side measures to be included in media We appreciate your help so far in observing the campaign and as aligned with the communication plan.) temporary use restrictions Introduction of NEUBs (Saving of 0 – 5% demand, 0 – Water levels are at very low levels so we ask you think 0.60 Ml/d). carefully about the waster you use Implementation of Emergency Drought Orders as Last Urge you not to waste any water Resort (Saving likely 0-10%, 0 – 3.70 Ml/d) Implementation of NEUB Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 2 – North Eryri Ynys Mon Drought Actions Sequence of Events

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Drought Management Options - Supply Side

8001.D2 - Removal of Llyn Cwellyn 10 Ml/d abstraction limit Option Name Removal of Llyn Cwellyn 10 Ml/d abstraction limit

Trigger(s) Developing drought- Preparation of option (or preceding actions) Drought- Welsh Water Executive to consider supply side Option and prepare Drought Orde application Severe Drought- Drought Order solutions would be sought for supply side option

Yield of action 2 Ml/d Ml/day unless stated otherwise

Location To large parts of North Eryri, and potentially to part of Ynys Mon Area affected or whole supply zone Implementation timetable We assume a decision from WG within 28 days of submitting the Preparation time, time of year Drought Order application. effective, duration The practical implementation of the option could be effected within 1 week. The option is most likely to be implemented during the late summer and autumn period

Drought orders are valid for up to 6 months. OptionImplementation Assessment Permissions required and Drought Order-WG constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved

Reduced storage in Llyn Cwellyn, which is designated as an SAC. Risk to the Environment (High/Medium/Low or unknown) Medium

Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for this impacts drought order in 2007. The EMP does not constitute an

Include details for features of Environmental Assessment Report (EAR) which would describe moderate and major sensitivity the potential impacts of drought order implementation on and minor sensitivity features from sensitive features. However, the EMP does present a hydrological designated sites assessment which lists the likely impacts of drought order implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought order

EnvironmentalAssessment implementation includes Llyn Cwellyn (minor hydrological impact) and three reaches of the Afon Gwyrfai, a total of 14.6km (hydrological impacts have been assessed as minor adverse in the summer and autumn period due to reduced frequency and duration of natural lake outflow). Resulting impacts of the changes to the level and flow regime on P a g e | 7

ecological features including macroinvertebrates (including white-clawed crayfish, if present), macrophytes (including Ranunculus in the Afon Gwyrfai and Litorella in Llyn Cwellyn) and fish (including Arctic charr, brown trout, eel and lamprey species (if present)) are anticipated to be significant. Llyn Cwellyn is designated as an SAC, and designation extends along the length of the Afon Gwyrfai. This is known as the Afon Gwyrfai a Llyn Cwellyn SAC and it is also designated as the Llyn Cwellyn and Afon Gwyrfai SSSI. Significant impacts of drought order implementation are anticipated on this designated site. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought permit was agreed by DCWW and NRW monitoring requirements (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: lake levels, river flows, biochemical water quality and phytoplankton, fish, macrophytes (including Ranunculus and Littorella) and macroinvertebrates (including white-clawed crayfish, if present). Mitigation measures The EMP identified the following mitigation measures: Llyn Cwellyn: Aeration of the reservoir if temperatures and oxygen levels become prohibitive for survival of the species, removal of Arctic charr , bullhead and white-clawed crayfish (if present) for temporary holding and if necessary fish rescue in consultation with NRW and restocking of coarse fish species. Afon Gwyrfai: Physical modification to existing structures that could present as barriers to fish migration, the phased introduction of reductions in the compensation release to avoid stranding of juveniles, freshet releases, capture and relocation of fish upstream of migratory barriers, installation of flow deflectors to ensure gravel remains silt free, creation of alternative refuges in deeper water, and if identified as required, fish rescue in consultation with NRW and/or restocking using off spring of broodstock from the catchment. Impact on other activities It is anticipated that there will be no significant impacts of e.g. fisheries, industry etc drought order implementation on landscape and visual amenity, recreation, or archaeology and cultural heritage. Impacts on angling, for both the reservoir and the river, are anticipated to be significant.

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8001.D3 - Reduction of Alaw Compensation water to 1.7 Ml/d Option Name Reduction of Alaw Compensation water to 1.7 Ml/d

Yield of action 1.5 Ml/d Ml/day unless stated otherwise Location North Anglesey Area affected or whole supply zone

Implementation timetable We assume a decision from NRW within 14 days of submitting Preparation time, time of year the Drought Permit application. effective, duration The practical implementation of the option could be effected within 1 week. This drought option could be implemented at any time during the year to maintain reservoir storage, and to improve reservoir winter refill.

OptionImplementation Assessment The drought permit would be in place for up to 6 months. Permissions required and Drought Permit-NRW constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved

Reduced flow in Afon Alaw. Risk to the Environment Medium (High/Medium/Low or unknown)

Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for this impacts drought permit in 2007. The EMP does not constitute an Include details for features of Environmental Assessment Report (EAR) which would describe

EnvironmentalAssessment Reservoir to the tidal limit at Llanfachraeth. Hydrological impacts have been assessed as major adverse in the summer and autumn, and moderate adverse during the winter. Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including white-clawed crayfish, if present), macrophytes and fish (including brown trout, eel and lamprey species (if present)) are P a g e | 9

anticipated to be significant. Alaw Reservoir has been designated as a SSSI, it has considerable ornithological interest especially for overwintering wildfowl. However, no significant impacts are anticipated on the SSSI as the drought permit will conserve the longevity of reservoir storage or aiding refill, therefore, resulting in beneficial impacts on the reservoir. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought permit was agreed by DCWW and NRW monitoring requirements (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: river flows, physico-chemical water quality, fish, macrophytes and macroinvertebrates (including white-clawed crayfish, if present). Mitigation measures The EMP identified the following mitigation measures: Physical modification to existing structures that could present as barriers to fish migration, the phased introduction of reductions in the compensation release to avoid stranding of juveniles capture and relocation of fish upstream of migratory barriers, installation of flow deflectors to ensure gravel remains silt free, creation of alternative refuges in deeper water, and if identified as required, fish rescue in consultation with NRW and/or restocking using off spring of broodstock from the catchment, Impact on other activities It is anticipated that there will be significant impacts of drought e.g. fisheries, industry etc permit implementation on angling. No significant impacts on landscape and visual amenity, recreation, or archaeology and cultural heritage are anticipated.

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8001.D4 - Reduction of Ffynnon Llugwy Compensation water Option Name Reduction of Ffynnon Llugwy Compensation water

Trigger(s) Developing drought- Preparation of option (or preceding actions) Drought- Welsh Water Executive to consider supply side Option and prepare Drought Permit applications Severe Drought- Drought Permit solutions would be sought for supply side option Yield of action 2 Ml/d

Ml/day unless stated otherwise Location Greater Bangor area and potentially part of Ynys Mon Area affected or whole supply zone

Implementation timetable We assume a decision from NRW within 14 days of submitting Preparation time, time of year the Drought Permit application. effective, duration The practical implementation of the option could be effected within 1 week. This drought option could be implemented at any time of the year but is most likely in the summer and autumn period, and may extend into winter. The drought permit would be in place for up to 6 months

OptionImplementation Assessment Permissions required and Drought Permit- NRW constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Reduced flow in the headwaters of the Afon Llugwy, a tributary of the River Conwy, or negotiate with RWE Npower the amount of water they abstract and eventually pass to Cowlyd Reservoir in the Dyffryn Conwy WRZ (see Environmental Monitoring Plan N6) Risk to the Environment Medium (High/Medium/Low or unknown) Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for this impacts drought permit in 2007. The EMP does not constitute an

Include details for features of Environmental Assessment Report (EAR) which would describe moderate and major sensitivity the potential impacts of drought permit implementation on and minor sensitivity features from sensitive features. However, the EMP does present a designated sites hydrological assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought permit

EnvironmentalAssessment implementation includes 1.5km of the Afon Llugwy from Ffynnon Llugwy Reservoir to the Llyn Cowlyd mill leat. Hydrological impacts have been assessed as major adverse in the summer and autumn, and moderate adverse in winter and spring. Resulting impacts of the changes to the flow regime on ecological features including significant effects are anticipated P a g e | 11

for macroinvertebrates (including freshwater pearl mussel and white clawed crayfish (if present)), macrophytes and fish are anticipated to be significant. Ffynnon Llugwy Reservoir is located within Snowdonia National Park, parts of which are designated as the Eryri SAC and SSSI for its features of geological, geomorphological and biological interest. No significant impacts are anticipated on the SAC and SSSI as the drought permit will conserve the longevity of reservoir storage and/or aid reservoir recharge. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought permit was agreed by DCWW and NRW monitoring requirements (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: reservoir level and outflow, physico-chemical water quality, phytoplankton, fish, macrophytes and macroinvertebrates (including white-clawed crayfish, if present). Mitigation measures The EMP identified the following mitigation measures: Creation of alternative refuges in deeper water, the phased introduction of reductions in the compensation release to avoid stranding of juvenile white-clawed crayfish (if present) and if identified as required, fish rescue in consultation with NRW and/or restocking using off spring of broodstock from the catchment. Impact on other activities No significant effects to landscape and visual amenity, e.g. fisheries, industry etc recreation and archaeology and cultural heritage are anticipated.

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8001.D5 - Reduction of Cefni Reservoir Compensation water Option Name Reduction of Cefni Reservoir Compensation water

Implementation timetable We assume a decision from NRW within 14 days of submitting Preparation time, time of year the Drought Permit application. effective, duration The practical implementation of the option could be effected within 1 week. This drought option is most likely to be implemented in the summer and autumn period. The drought permit would be in place for up to 6 months

Permissions required and Drought Permit- NRW OptionImplementation Assessment constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option As part of the Environmental Monitoring Plan (N5) Welsh Water will assess the potential impact on the Afon Cefni for effluent dilution from Llangefni WTW which discharges into the Afon Cefni approximately 4 km downstream of the compensation flow discharge point. Risk to the Environment Medium (High/Medium/Low or unknown) Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for this impacts drought permit in 2007. The EMP does not constitute an

Include details for features of Environmental Assessment Report (EAR) which would describe

moderate and major sensitivity the potential impacts of drought permit implementation on and minor sensitivity features from sensitive features. However, the EMP does present a designated sites hydrological assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought permit implementation includes two reaches of the Afon Cefni from EnvironmentalAssessment Cefni Reservoir to Llangefni industrial Estate (3.5km, major hydrological impact) and from Llangefni industrial Estate to the tidal limit (2.5km, moderate hydrological impact). Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including freshwater pearl mussel if present), macrophytes and fish P a g e | 13

(including brown/sea trout, eel, lamprey species and Atlantic salmon) are anticipated to be significant. Cefni Reservoir is recognised as an important habitat for waterfowl and wading birds and is a key wetland site in the Anglesey Wetland Strategy. No significant impacts are anticipated for Cefni Reservoir as the drought permit will conserve the longevity of reservoir storage. Approximately 500m of the Afon Cefni upstream of the tidal limit falls within the extensive flood plain area designated as Malltraeth Marsh SSSI. Features of the designation include wet meadows, flora of ditches and watercourses, migrating and wintering waders and wildfowl, dragonfly species and notable water beetles. In light of the water dependant nature of some of the designated features of the SSSI, impacts on this site are anticipated to be significant. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought permit was agreed by DCWW and NRW monitoring requirements (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: river flows, physico-chemical water quality, fish, macrophytes (including Ranunculion fluitantis and Callitricho- Batrachion vegetation) and macroinvertebrates (including white- clawed crayfish and freshwater pearl mussel, if either or both of these species are present). Mitigation measures The EMP identified the following mitigation measures: Higher flows or freshets during periods of macrophyte flowering and setting seed and fish migration periods, standardise the flow regime to alleviate diurnal fluctuations in flow, physical modification to existing structures identified as barriers to fish migration, capture and relocation of fish upstream of barriers, flow deflectors may be used to ensure gravel remains silt free, creation of alternative refuges in deeper water, and if identified as required, fish rescue in consultation with NRW and/or restocking using off spring of broodstock from the catchment. If identified as present within the hydrological zone of influence of the drought order, freshwater pearl mussels could be removed to hatchery temporarily. Impact on other activities No significant impacts on landscape and visual amenity, e.g. fisheries, industry etc recreation and archaeology and cultural heritage are anticipated. There is the potential for significant impacts on angling.

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8001.D6 - Transfer of water from Marchlyn Mawr (the Dinorwig System) to Marchlyn Bach Option Name Transfer of water from Marchlyn Mawr (the Dinorwig System) to Marchlyn Bach Trigger(s) Developing drought- Preparation of option (or preceding actions) Drought- Welsh Water Executive to consider supply side Option and prepare Drought Permit applications Severe Drought- Drought Permit solutions would be sought for supply side option

Yield of action Between 0 and 3 Ml/d depending on eventual capacity of Ml/day unless stated otherwise refurbished Marchlyn Bach raw water main. Location Benefit to greater Bangor area and potentially part of Area affected or whole supply zone Ynys Mon

Implementation timetable 4 weeks; dependent on achieving agreement, mobilising, Preparation time, time of year effective, and completion of the engineering task. duration We assume a decision from NRW within 14 days of submitting the Drought Permit application.

Permissions required and constraints Access rights to land for the temporary pipeline route. Including details of liaison carried out with

OptionImplementation Assessment bodies responsible for giving any permits or Drought Permit-NRW approvals Risks associated with option The application, as applied for, is not approved DWI issue- the source is not a DCWW asset and would require DWI approval. Samples will need to be taken over a period to confirm water quality. Timescales – there is a risk this option could take longer than 4 weeks to implement due to the engineering implications. Risk to the Environment Unknown, possibly high as pipeline route is through (High/Medium/Low or unknown) Snowdonia SAC. Works required for pipeline construction and decommissioning are assumed to be carried out to Best Practice construction guidelines, therefore, no significant

impacts of construction activities are anticipated. Summary of likely environmental impacts Works required for pipeline construction and Include details for features of moderate and decommissioning are assumed to be carried out to Best major sensitivity and minor sensitivity Practice construction guidelines, therefore, no significant features from designated sites impacts of construction activities are anticipated. Baseline information used

Summary of additional baseline monitoring

requirements EnvironmentalAssessment Mitigation measures

Impact on other activities e.g. fisheries, industry etc

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8001.D7 - Pumped abstraction from Llyn Cwellyn below the gravity intake level (requires installation of temporary pumps and infrastructure) Option Name Pumped abstraction from Llyn Cwellyn below the gravity intake level (requires installation of temporary pumps and infrastructure) Trigger(s) Developing drought- Preparation of option (or preceding actions) Drought- Welsh Water Executive to consider supply side Option and prepare Drought Order applications Severe Drought- Drought Order solutions would be sought for

supply side option Yield of action 10 Ml/d Ml/day unless stated otherwise

Location North Eryri and potentially parts of Ynys Mon Area affected or whole supply zone

Implementation timetable We assume a decision from WG within 28 days of submitting the Preparation time, time of year Drought Order application. effective, duration The practical implementation of the option could be effected within 4 weeks. The option is most likely to be implemented during the late summer and autumn period

OptionImplementation Assessment Drought orders are valid for up to 6 months. Permissions required and Drought Order- WG constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved

Risk to the Environment Medium (High/Medium/Low or unknown)

Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for this impacts drought order in 2007. The EMP does not constitute an Include details for features of Environmental Assessment Report (EAR) which would describe the

moderate and major sensitivity and potential impacts of drought order implementation on sensitive minor sensitivity features from features. The EMP considers the drawdown of the lake to 2.6m, designated sites however, the impacts of pumping to abstract below 2m were not included in the assessment. However, the EMP does present a hydrological assessment which lists the likely impacts of drought order implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors.

EnvironmentalAssessment The zone of hydrological influence of drought order implementation includes Llyn Cwellyn (minor hydrological impact) and three reaches of the Afon Gwyrfai, a total of 14.6km (hydrological impacts have been assessed as minor adverse in the summer and autumn period due to reduced frequency and duration of natural lake outflow). Resulting impacts of the changes to the level and flow regime and

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the impacts associated with the required pumping to abstract on ecological features including macroinvertebrates (including white- clawed crayfish, if present), macrophytes (including Ranunculus in the Afon Gwyrfai and Litorella in Llyn Cwellyn) and fish (including Arctic charr, brown trout, eel and lamprey species (if present)) are anticipated to be significant. Impacts associated with the installation and operation of temporary infrastructure for pumping are anticipated to not be significant. Llyn Cwellyn is designated as an SAC, and designation extends along the length of the Afon Gwyrfai. This is known as the Afon Gwyrfai a Llyn Cwellyn SAC and it is also designated as the Llyn Cwellyn and Afon Gwyrfai SSSI. Significant impacts of drought order implementation are anticipated on this designated site. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought permit was agreed by DCWW and NRW monitoring requirements (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: lake levels, river flows, biochemical water quality and phytoplankton, fish, macrophytes (including Ranunculus and Littorella) and macroinvertebrates (including white-clawed crayfish, if present). Mitigation measures The EMP identified the following mitigation measures: Llyn Cwellyn: Aeration of the reservoir if temperatures and oxygen levels become prohibitive for survival of the species, removal of Arctic charr , bullhead and white-clawed crayfish (if present) for temporary holding and if necessary fish rescue in consultation with NRW and restocking of fish species. In addition to the recommendations made in the EMP, mitigation measures for pumping should include fish screening and detailed sensitive consideration of pump location/positioning (off the lake bed and avoiding sensitive habitats where possible) and construction/decomissioning in line with Best Practice construction guidelines. Afon Gwyrfai: Physical modification to existing structures that could present as barriers to fish migration, the phased introduction of reductions in the compensation release to avoid stranding of juveniles, freshet releases, capture and relocation of fish upstream of migratory barriers, installation of flow deflectors to ensure gravel remains silt free, creation of alternative refuges in deeper water, and if identified as required, fish rescue in consultation with NRW and/or restocking using off spring of broodstock from the catchment. Impact on other activities It is anticipated that there will be no significant impacts of drought e.g. fisheries, industry etc order implementation on landscape and visual amenity, recreation, or archaeology and cultural heritage. Impacts on angling, for both the reservoir and the river, are anticipated to be significant. P a g e | 17

Llyn Cwellyn Drought Action Zones 100

90 NORMALOPERATION

80 DEVELOPING DROUGHT 70

60 DROUGHT

50 SEVERE DROUGHT

40 Reservoir StorageReservoir (%)

EMERGENCY STORAGE 30

DEAD STORAGE 10

01/01 15/01 29/01 19/02 05/03 09/04 23/04 14/05 28/05 02/07 16/07 06/08 20/08 03/09 24/09 08/10 12/11 26/11 17/12 31/12 08/01 22/01 05/02 12/02 26/02 12/03 19/03 26/03 02/04 16/04 30/04 07/05 21/05 04/06 11/06 18/06 25/06 09/07 23/07 30/07 13/08 27/08 10/09 17/09 01/10 15/10 22/10 29/10 05/11 19/11 03/12 10/12 24/12

Figure 1 - Llyn Cwellyn Reservoir Storage

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Llyn Ffynnon Llugwy Drought Action Zones 100

NORMAL OPERATION 80

DEVELOPING DROUGHT 70

60 DROUGHT

40 ReservoirStorage (%) SEVERE DROUGHT

EMERGENCY STORAGE 10

01/01 22/01 05/02 26/02 12/03 26/03 16/04 30/04 04/06 18/06 09/07 23/07 06/08 27/08 10/09 01/10 15/10 29/10 19/11 03/12 08/01 15/01 29/01 12/02 19/02 05/03 19/03 02/04 09/04 23/04 07/05 14/05 21/05 28/05 11/06 25/06 02/07 16/07 30/07 13/08 20/08 03/09 17/09 24/09 08/10 22/10 05/11 12/11 26/11 10/12 17/12 24/12 31/12

Figure 2 - Ffynnon Llugwy Drought Action Zones P a g e | 19

Figure 3 - Llyn Alaw Drought Action Zones

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Llyn Cefni Drought Action Zones 100

NORMALOPERATION 90

80 DEVELOPING DROUGHT

70 DROUGHT 60

40 SEVERE DROUGHT ReservoirStorage (%)

EMERGENCY STORAGE 10

Figure 4 - Llyn Cefni Drought Action Zones P a g e | 21

Clwyd Coastal - 8012

Location Plan 2 - Clwyd Coastal Water Resource Zone

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Clwyd Coastal Water Resources

No. Location Licence No. Type

1 Llyn Aled N/A Impounding Reservoir

2 Aled Isaf Reservoir N/A Impounding Reservoir

3 Plas Uchaf Reservoir 24/66/06/0007 Impounding Reservoir

4 Dolwen Reservoir 24/66/06/0007 Impounding Reservoir

5 Bryn Aled 24/66/05/0007 River Abstraction – pumped regulation scheme

6 Llannerch 24/66/03/0048 Boreholes

7 Ffynnon Asaph 24/66/07/0034 Spring

8 Llyn Bran 24/67/04/0021 Impounding Reservoir

9 Llanynys 24/66/02/0012 Borehole

10 Pont Glanywern 24/66/03/0049 Borehole

11 Ruthin 24/66/01/0040 Borehole Table 3 - Clwyd Coastal abstraction licences

The location of the WRZ is shown on the Welsh Water Area map and the location of the resources are shown in Location Plan 2. DCL’s have been defined for the combined reservoir storage in Llyn Aled and Aled Isaf as shown in Figure 5 and drought actions are given in Table 4. Current Resource Status The WRZ is managed, and best explained, by the two WTW’s at Glascoed and Trecastell. Trecastell WTW is supplied solely from a spring source at Ffynnon Asaph. Welsh Water is licensed to abstract at a maximum daily rate of 4.55 Ml (1636.56 Ml/yr). The spring at Ffynon Asaph is occasionally affected by turbidity during which time the Prestatyn area of this WRZ is supplied from Glascoed WTW. All other sources feed into Glascoed WTW which then serves the majority of the WRZ. These sources are: a river abstraction from the Afon Aled at the Bryn Aled Pumping Station which is supported by river regulation releases from the Aled Isaf and Llyn Aled Reservoirs (live storages of 1136Ml and 1726 Ml respectively). Abstracted water from the Afon Aled is held in the Plas Uchaf Reservoir (which also receives water from Dolwen Reservoir) which effectively provides bankside storage. This arrangement is the subject of a Section 20 Operating Agreement between Welsh Water and NRW. In operational terms the Aled river regulation system needs to sustain an average of 12 to 15 Ml/d under dry weather conditions. Llannerch boreholes. The abstraction from the Llannerch boreholes is supported from the artesian boreholes at Llanynys, Pont Glanywern and Ruthin, and the pumped borehole supplies from Llwyn Isaf, Plas yr Esgob and Efailnewydd boreholes via the River Clwyd.

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Llanynys, Pont Glanywern, and Llwyn Isaf boreholes have been subject to the Review of Consents process undertaken by Natural Resources Wales to meet their obligations under the EU Habitats Directive. The assessment considered the effects of our abstractions upon the Llwyn SAC. Agreed licence changes have been made to lessen the impact of our operations upon the Llwyn SAC. During 2012/2013 the average demand in this WRZ was 19.80 Ml/d and the peak week demand was 22.81 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications Key Message Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction to remain within licensed Use the water that you need but please don’t waste levels. amount, within its operational rules and it within the quality constraints. Ongoing leakage maintenance and water efficiency General Water Efficiency Campaigns via: work streams. - Radio Preplanning for the implementation of ‘Media - Education Centres Campaign with Water Efficiency Device Offering’ and ‘Enhanced Leakage Management’ option. - Water Efficiency Web Page Developing Raise and increase awareness of the importance of Commence increased liaison with Use what you need but please don’t waste water Drought water conservation measures through the established operational colleagues and NRW in line We increasingly need your help to conserve water media campaigns as per the communication plan with Management and Communications supplies which will include requests for voluntary restraint. Plan. We are also doing our bit by ensuring we fix leaks Progress ‘Media Campaigns with Water Efficiency Review and implement where feasible quickly to prevent waste Device Offering’ option tankering to support lower resource and/ or from neighbouring zone. Continuation of Normal Activities plus Undertake ‘Enhanced Leakage Management’ option Consider transfer from Alwen Dee WRZ Enhanced targeted Water Efficiency Messaging via: Supply / demand situation continually monitored throughout the drought situation and the - Commencement of local engagement and effectiveness of demand-side measures. educational road shows Continuation of preceding options. - Letter drop Preplanning for the implementation of TUBs and - Engagement with stakeholders through face to face NEUBs. briefings, direct mail or social media activity Prepare and Publish DCWW Drought Web Page TUB consultation via printed media Drought Increasing public awareness and content of new Within WRZ support for vulnerable We’ve introduced a temporary hosepipe ban as a demand-side measures to be included in media sources. last resort to help conserve water supplies campaign and as aligned with the communication Implement environmental monitoring in Ask you to respect this to ensure supplies to people plan.) line with Monitoring Plan. in the area are conserved Introduction of TUBs (Saving of 0 – 5% demand). Continue to review and implement where Thank you in advance for your cooperation Continuation of preceding options. feasible tankering to support lower Implement TUBS resource and/ or from neighbouring zone. Preplanning for the implementation of NEUBs.

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Prepare drought Permit applications for Continuation of Previous Techniques plus Enhanced Options 8012.D1 - D6. messaging via: - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service - Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new Welsh Water Executive to consider Continuation of Previous Activities with the Drought demand-side measures to be included in media application for Drought Permit(s) for enhanced message campaign and as aligned with the communication supply side options 8012.D1 -D6. We appreciate your help so far in observing the plan.) temporary use restrictions Introduction of NEUBs (Saving of 0 – 5% demand). Water levels are at very low levels so we ask you Continuation of preceding options. think carefully about the waster you use Implementation of Emergency Drought Orders as Last Urge you not to waste any water Resort (Saving likely 0-10%, 0 – 0.1.98 Ml/d) Implementation of NEUB: Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers - Local Media - Letter Drop and or Text Service - Engagement with Chamber of Commerce and Trade Bodies - Preparation for Emergency Drought Orders - Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 4 - Drought Actions for Clwyd Coastal WRZ

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Drought Management Options - Supply Side

8012.D1 - Transfer water from Llyn Bran to Afon Aled Option Name Transfer water from Llyn Bran to Afon Aled

Trigger(s) Drought- Prepare drought permit application (or preceding actions) Severe Drought- Welsh Water Executive to consider application for Drought Permit(s) Yield of action 1.45 Ml/d Ml/day unless stated otherwise Location The additional water transferred to the Afon Aled (at a point Area affected or whole supply zone downstream of the Aled Isaf regulation release) will be discharged into Nant y Lladron and would enable Welsh Water to reduce the regulation release from Aled Isaf, in support of the Bryn Aled abstraction, by 1.45 Ml/d.

This will preserve storage in the Aled Reservoirs for longer and enable Welsh Water to sustain the ongoing support for the Bryn Aled abstraction for a longer period. The effect will be for increased flows through the Nant y Lladron stream - a tributary of the Afon Aled. Assessment and ongoing monitoring of the ecological impacts are covered in the Environmental Monitoring Plan (N1). Implementation timetable We assume a decision from NRW within 14 days of Preparation time, time of year submitting the Drought Permit application. effective, duration The practical implementation of the option could be effected within 4 weeks; dependent on achieving agreement, mobilising, and completion of the engineering task. This will

include a tapping point installation on the raw water pipe OptionImplementation Assessment from the reservoir which crosses Nant y Lladron. A Magflow meter, along with logger/telemetry will also be required. The option is most likely to be implemented during the summer and autumn period, although it could be implemented at any time during the year. The drought permit would be in place for up to 6 months. Permissions required and constraints Drought Permit and Flood Defense Consent- NRW Including details of liaison carried out The Bryn Aled abstraction licence will need to be amended to with bodies responsible for giving any allow for an increase in the annual licence quantity (see permits or approvals Option 4)

Risks associated with option The application, as applied for, is not approved. Timescales – there is a risk this option could take longer than 4 weeks to implement due to the engineering implications Risk to the Environment Unknown, anticipated to be medium (High/Medium/Low or unknown) Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for impacts this drought permit in 2007. The EMP does not constitute an

Include details for features of Environmental Assessment Report (EAR) which would Assessment

Environmental moderate and major sensitivity and describe the potential impacts of drought permit minor sensitivity features from implementation on sensitive features. However, the EMP

P a g e | 27

designated sites does present a hydrological assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought permit implementation includes Llyn Bran (lake drawdown, magnitude of hydrological impact unknown), Nant-y-Lladron (flow increase, major hydrological impact) and Afon Deunant (flow increase, moderate hydrological impact). Additional flows in the watercourses at a time of natural drought could result in some beneficial impacts on some ecological receptors. Conversely, habitats that are used to low flows or periodic drying could be impacted, or there could be impacts due to washout of species.No designated sites have been identified that have the potential to be impacted during drought permit implementation. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought permit, was agreed by DCWW and monitoring requirements NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: reservoir level, river flows, physico- chemical water quality and phytoplankton, river habitat survey, fish (including salmonids and lamprey species), macrophytes and macroinvertebrates (including white- clawed crayfish). Mitigation measures Mitigation measures were identified in the EMP. These include: The increase in compensation release should be phased in gradually, measures to reduce entrainment e.g. screening, protection of nursery habitats (back eddies and marginal habitats) using bunds or deflectors aeration of the reservoir if temperatures and oxygen levels become prohibitive for survival of fish, if necessary, fish rescue in consultation with NRW (in the reservoir), and/or restocking of coarse fish and crayfish rescue (if identified as present). Impact on other activities There is the potential for impacts on landscape and visual e.g. fisheries, industry etc amenity and recreation as a result of reservoir drawdown. There are also potential impacts on archaeology and cultural heritage associated with higher flows in the watercourses. However, the significance of these impacts is currently unknown.

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8012.D2 - Reduction of the compensation release from Aled Isaf and modification of the Hands Off Flow value at Bryn Aled Reduction of the compensation release from Aled Isaf and Option Name modification of the Hands Off Flow value at Bryn Aled Drought- Prepare drought permit applications Trigger(s) Severe Drought- Welsh Water Executive to consider application for Drought Permit(s) (or preceding actions) 1.0 Ml/d Yield of action

Ml/day unless stated otherwise Welsh Water would be releasing water from the Aled Location Reservoirs to support the Bryn Aled abstraction. The gain in supply will be made by slowing the drawdown of the Aled Area affected or whole supply zone Reservoirs, enabling the regulation release to be sustained for longer to the whole WRZ. We assume a decision from NRW within 14 days of submitting Implementation timetable the Drought Permit application. The practical implementation of the option could be effected Preparation time, time of year within 1 week. effective, duration The option is most likely to be implemented during the summer and autumn period, although it could be

OptionImplementation Assessment implemented at any time during the year. The drought permit would be in place for up to 6 months. Drought Permit- NRW Permissions required and constraints

Including details of liaison carried out with bodies responsible for giving any permits or approvals The application, as applied for, is not approved. Risks associated with option

Risk to the Environment Low (High/Medium/Low or unknown)

An Environmental Monitoring Plan (EMP) was prepared for

Summary of likely environmental this drought permit in 2007. The EMP does not constitute an impacts Environmental Assessment Report (EAR) which would describe the potential impacts of drought permit Include details for features of implementation on sensitive features. However, the EMP moderate and major sensitivity and does present a hydrological assessment which lists the likely minor sensitivity features from impacts of drought permit implementation on the flow/level designated sites regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes

EnvironmentalAssessment on sensitive ecological receptors. The zone of hydrological influence during drought permit implementation includes the Afon Aled from the outflow of Aled Isaf Reservoir to the Bryn Aled intake (negligible hydrological impact) and from the Bryn Aled intake to the

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confluence with the Afon Elwy (minor hydrological impact). Resulting impacts of negligible to minor changes to the flow regime on ecological features including macrophytes, macroinvertebrates and fish are considered unlikely to be significant. Llyn Aled and Aled Isaf Reservoirs are located within the water associated SSSI, Mynydd Hiraethog. However, the drought permit will conserve the longevity of reservoir storage, therefore, no impacts on this designated site are anticipated. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought permit was agreed by DCWW and Summary of additional baseline NRW (then Environment Agency Wales and CCW). The EMP monitoring requirements recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: river flows, physico-chemical water quality and phytoplankton, fish, macrophytes and macroinvertebrates (including white-clawed crayfish, if present). Mitigation measures were identified in the EMP. These Mitigation measures include: If necessary, fish rescues in consultation with NRW, restocking using offspring of broodstock from the catchment, flow deflectors may be used to ensure gravel remains silt free, creation of alternative refuges in deeper water, gradually phase in alterations to compensation flow to avoid species occupying shallow water becoming stranded and restocking of coarse fish. It is anticipated that there will be no significant effects to Impact on other activities landscape and visual amenity, recreation (excluding angling) and archaeology and cultural heritage. e.g. fisheries, industry etc

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8012.D3 - Pump water from Llyn Aled ‘dead’ storage Option Name Pump water from Llyn Aled ‘dead’ storage

Trigger(s) Drought- Prepare drought permit applications (or preceding actions) Severe Drought- Welsh Water Executive to consider application for Drought Permit(s) Yield of action 1.0 Ml/d Ml/day unless stated otherwise

Location This volume would sustain a 9 Ml/d Afon Aled river support

Area affected or whole supply zone plus the reduced compensation release from Aled Isaf Reservoir of 1.27 Ml/d for about 40 days using temporary pumps, generators, and pipes in the direct locality of the dam. The Dead Storage volume is considered to be up to 550 Ml. To utilise this storage Welsh Water would have to pump the water into the lowest intake to discharge it into the Afon Aled. Implementation timetable We assume a decision from NRW within 14 days of submitting Preparation time, time of year the Drought Permit application. effective, duration The practical implementation of the option could be effected within 4 weeks.

OptionImplementation Assessment The option is most likely to be implemented during the autumn period, although it could be implemented at any time during the year. The drought permit would be in place for up to 6 months. Permissions required and constraints Drought Permit- NRW Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved.

Risk to the Environment (High/Medium/Low or unknown) Medium - High

Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for

impacts this drought permit in 2007. The EMP does not constitute an

Include details for features of Environmental Assessment Report (EAR) which would moderate and major sensitivity and describe the potential impacts of drought permit minor sensitivity features from implementation on sensitive features. However, the EMP designated sites does present a hydrological assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. EnvironmentalAssessment The zone of hydrological influence of drought permit implementation includes Aled Isaf Reservoir (minor hydrological impact) and Llyn Aled Reservoir (major hydrological impact). The maintenance of the reservoirs at low levels and in

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extreme circumstances the emptying of the reservoirs has the potential to have a high magnitude of impact on sensitive features. Significant impacts are anticipated on macroinvertebrates (including white-clawed crayfish if present), macrophytes and fish species. Llyn Aled and Aled Isaf Reservoirs are located within the water associated SSSI, Mynydd Hiraethog. Impacts on the SSSI are anticipated to be significant. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP recommended baseline monitoring, and monitoring monitoring requirements that should be undertaken during and after implementation of a drought permit for: reservoir levels and outflows, physico-chemical water quality and phytoplankton, fish, macrophytes, white-clawed crayfish (if present) and fixed point photography for landscape and visual amenity impacts. Mitigation measures The EMP identified the following mitigation measures: Aeration of the reservoir if temperatures and oxygen levels become prohibitive for survival of fish, if necessary, fish rescue in consultation with NRW (in the reservoir), and/or restocking of coarse fish and crayfish rescue (if identified as present). Impact on other activities It is anticipated that there will be significant effects to e.g. fisheries, industry etc landscape and visual amenity and recreation (including angling and sailing) as a result of the reservoir drawdown. Potential impacts on archaeology and cultural heritage are unknown.

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8012.D4 - Relaxation of the annual licences on Afon Aled and the Plas Uchaf and Dolwen reservoirs Option Name Relaxation of the annual licences on Afon Aled and the Plas Uchaf and Dolwen reservoirs Trigger(s) Drought- Prepare drought permit applications (or preceding actions) Severe Drought- Welsh Water Executive to consider application for Drought Permit(s)

Yield of action 5.0 Ml/d Ml/day unless stated otherwise

Location The annual licences for the Bryn Aled abstraction and the Area affected or whole supply zone consequent abstraction of water from the Plas Uchaf and Dolwen reservoirs constrain the WRZ. The Drought Permit application would allow the water, made available through Options 1 and 3, to be abstracted at Bryn Aled and from the Plas Uchaf and Dolwen reservoirs. Implementation timetable We assume a decision from NRW within 14days of submitting Preparation time, time of year the Drought Permit application. effective, duration The practical implementation of the option could be effected within 1 week. OptionImplementation Assessment Permissions required and constraints Drought Permit- NRW Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option

Risk to the Environment (High/Medium/Low or unknown) Unknown

Summary of likely environmental No designated sites identified. impacts Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites Baseline information used

Summary of additional baseline monitoring requirements

EnvironmentalAssessment Mitigation measures

Impact on other activities e.g. fisheries, industry etc

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8012.D5 - Relaxation of the Llannerch boreholes annual licence Option Name Relaxation of the Llannerch boreholes annual licence

Location This option would allow the abstractions at Bryn Aled/ Plas Area affected or whole supply zone Uchaf & Dolwen reservoirs to be reduced, thereby assisting the refill of Llyn Aled and Aled Isaf reservoir. Implementation timetable We assume a decision from NRW within 14 days of Preparation time, time of year submitting the Drought Permit application. effective, duration The practical implementation of the option could be effected within 1 week. Drought permit implementation would be during the autumn and winter period, as there is no ability to exceed the annual licence condition before early-September and it resets on 1 January. Drought permits are valid for up to 6 months. Permissions required and constraints Drought Permit- NRW Including details of liaison carried out The abstraction from the Llannerch boreholes is constrained with bodies responsible for giving any by the annual licence. permits or approvals

Risks associated with option The application, as applied for, is not approved. OptionImplementation Assessment Risk to the Environment (High/Medium/Low or unknown) Low Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for impacts this drought permit in 2009. The EMP does not constitute an Include details for features of Environmental Assessment Report (EAR) which would moderate and major sensitivity and describe the potential impacts of drought permit

minor sensitivity features from implementation on sensitive features. However, the EMP designated sites does present a hydrological assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought permit implementation includes three reaches of the Afon Clwyd

EnvironmentalAssessment from Pont y Cambwll to the Clwyd Elwy confluence (a total of 10.1km, minor hydrological impact). Three additional watercourses may be hydrologically influenced during drought permit implementation, the Nant Padrig, Afon Bach and an unnamed brook (a total of 1.6km), however, the magnitude of hydrological impact on these watercourses is currently unknown and additional baseline data would be required to complete this assessment.

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Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates, macrophytes and fish (including brown/sea trout, eel, lamprey species and Atlantic salmon) are not anticipated to be significant. No designated sites have been identified that have the potential to be impacted during drought permit implementation. Baseline information used An EMP was prepared for this drought option in 2009 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought permit was agreed by DCWW and monitoring requirements NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: river flows, groundwater level, biochemical water quality, fish, macrophytes and macroinvertebrates. Mitigation measures The EMP identified the following mitigation measures. Physical modification to existing structures identified as barriers to fish migration, capture and relocation of fish upstream of barriers, flow deflectors may be used to ensure gravel remains silt free, creation of alternative refuges in deeper water, and if identified as required, fish rescue in consultation with NRW and/or restocking using off spring of broodstock from the catchment. Impact on other activities No significant impacts on landscape and visual amenity, e.g. fisheries, industry etc recreation (including angling) and archaeology and cultural heritage are anticipated.

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8012.D6 - Pumped (winter) refill from Aled Isaf to Llyn Aled Option Name Pumped (winter) refill from Aled Isaf to Llyn Aled

Location Llyn Aled has a very small catchment area and so would have Area affected or whole supply zone difficulties refilling following implementation of Option 8012.D3, therefore Option 8012.D6 would need to be planned in tandem.

Implementation timetable We assume a decision from NRW within 14 days of Preparation time, time of year submitting the Drought Permit application. effective, duration The practical implementation of the option could be effected within 6 weeks in order to install pumps and approx 1km temp pipeline up towards Llyn Aled (discharging into Llyn Aled catchwater allowing gravity flow). The option is most likely to be implemented during the winter period, although it could be implemented at any time

OptionImplementation Assessment during the year. The drought permit would be in place for up to 6 months. Permissions required and constraints Drought Permit and Flood Defense Consent- NRW Including details of liaison carried out This option is linked to option 8012.D3 and so we would with bodies responsible for giving any apply for the pumped refill either at the same time, or as permits or approvals soon as we would have been granted the 8012.D3 Drought Permit. Risks associated with option The application, as applied for, is not approved. Timescales – there is a risk this option could take longer than 6 weeks to implement due to the engineering implications Risk to the Environment (High/Medium/Low or unknown) Medium – High Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for impacts this drought permit in 2007. The EMP does not constitute an

EnvironmentalAssessment The zone of hydrological influence of drought permit implementation includes Aled Isaf Reservoir and Llyn Aled Reservoir. The option would aid refill of Llyn Aled Reservoir to the detriment of Aled Isaf Reservoir. No significant hydrological impacts on downstream watercourses are anticipated.

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The maintenance of Aled Isaf Reservoir at low levels has the potential to have significant impacts on sensitive features although beneficial impacts on features in Llyn Aled. Significant impacts are anticipated on macroinvertebrates (including white-clawed crayfish if present), macrophytes and fish species. Llyn Aled and Aled Isaf Reservoirs are located within the water associated SSSI, Mynydd Hiraethog. Impacts on the SSSI are anticipated to be significant. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP recommended baseline monitoring, and monitoring monitoring requirements that should be undertaken during and after implementation of a drought permit for: reservoir levels and outflows, physico-chemical water quality and phytoplankton, fish, macrophytes, white-clawed crayfish (if present) and fixed point photography for landscape and visual amenity impacts. Mitigation measures The EMP identified the following mitigation measures: Aeration of the reservoir if temperatures and oxygen levels become prohibitive for survival of fish, if necessary, fish rescue in consultation with NRW (in the reservoir), and/or restocking of coarse fish and crayfish rescue (if identified as present). Impact on other activities It is anticipated that there will be significant effects to e.g. fisheries, industry etc landscape and visual amenity and recreation (including angling and sailing) as a result of the reservoir drawdown, however, impacts are likely to be beneficial on Llyn Aled. Potential impacts on archaeology and cultural heritage are unknown.

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Llyn Aled and Aled Isaf Drought Action Zones 100

90 NORMALOPERATION

80 DEVELOPING DROUGHT

60 DROUGHT

40 ReservoirStorage (%) SEVERE DROUGHT

10 EMERGENCY STORAGE

Figure 5 - Llyn Aled and Aled Isaf Combined Drought Action Zones

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Alwen Dee - 8014

Location Plan 3 - Alwen Dee Water Resource Zone

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Alwen/ Dee Water Resources No. Location Licence No. Type 1 Alwen 24/67/04/0016 Impounding Reservoir 2 Cilcain 24/67/08/0056 Impounding Reservoir 24/67/09/0148 & 3 River Dee (Poulton) Regulated River Pumped Abstraction 24/67/09/165 4 Bretton (& Pulford & Gorstella) 24/67/10/0087 Boreholes 5 Plas yr Esgob 24/66/01/0038 Borehole 6 Efailnewydd 24/66/01/0041 Borehole 7 Llwyn Isaf 24/66/03/0028 Borehole Bulk Supply from United Utilities and so 8 Ashgrove WTW N/A does not have a DCWW abstraction licence Table 5 - Alwen/ Dee abstraction licences

The location of the WRZ is shown on the Welsh Water Area map and the location of the resources is shown in Location Plan 3. DCL’s have been defined for Alwen Reservoir, as shown in Figure 6 and drought actions are given in Table 6. It should be noted that Welsh Water operates Ashgrove WTW, near Chester. The WTW obtains its raw water via a bulk supply from the United Utilities abstraction on the Dee at Heronbridge pumping station. Ashgrove WTW does not produce water of a potable standard but is used to supply Albion Water (a licensed water undertaker) who in turn supply Shotton Paper. The drought actions discussed below assume that Ashgrove WTW will continue to supply Albion Water without restriction (though subject to the conditions in the formal agreement between the two companies) throughout such drought events. This point has been discussed and agreed with United Utilities and confirmed to Albion Water. Current Resource Status Welsh Water’s routine operation in this WRZ is to supply demand from a combination of Bretton WTW (supplied from the River Dee abstraction at Poulton and subject to the various Dee drought stages discussed below) and from Alwen WTW supplied from Alwen Reservoir. The live storage of Alwen Reservoir is 13619 Ml with a normal compensation release of 13.6 Ml/d during the summer and 6.8 Ml/d during the winter. Welsh Water is licensed to abstract 55 Ml/d (18300 Ml/yr). During 2012/2013 the average demand in this WRZ was 42.45 Ml/d and the peak week demand was 48.76 Ml/d. Dee General Directions The River Dee is a regulated source and is managed in accordance to the Dee General Directions which are the responsibility of NRW, supported by the three major water companies in the area (Welsh Water, Dee Valley, and United Utilities) and Canals and Rivers Trust (CRT). The purpose of the Directions is (amongst other things) to manage the river regulation releases from Llyn Celyn and Llyn Brenig in the headwaters of the Dee for abstraction by three water companies and the CRT(to the Llangollen Canal) in the lower part of the catchment. Integral to this process is the operation of the Dee Consultative Committee (DCC), which comprises representatives of the three water companies, CRT and NRW. The DCC has adopted a mutually acceptable operating regime that incorporates appropriate drought management actions to reflect the overall storage position of Llyn Celyn and Llyn Brenig.

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Under the DCC there are three drought stages that require each of the companies to take action: Dee Stage 1 requires Welsh Water to maintain its abstraction at 1 Ml/d below Welsh Water’s ‘Safe Yield’ daily amount of 30.25 Ml/d. Dee Stage 2 requires Welsh Water to maintain its abstraction at 2 Ml/d below Welsh Water’s ‘Safe Yield’ daily amount of 30.25 Ml/d. Dee Stage 3 would probably require all water companies to introduce a hosepipe ban in the respective WRZ. Llwyn Isaf borehole has been subject to the Review of Consents process undertaken by Natural Resources Wales to meet their obligations under the EU Habitats Directive. The assessment considered the effects of our abstractions upon the Llwyn SAC. Agreed licence changes have been made to lessen the impact of our operations upon the Llwyn SAC. It should also be noted that modelling of the Dee operations shows that Stage 3 conditions have not happened since 1920; conditions necessary to generate a Stage 3 storage position require a three- season drought (a dry summer followed by a dry winter followed by a subsequent dry summer). Therefore there would be a significant period of advance warning of developing Stage 3 conditions.

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Drought Actions – Sequence of Events

Resource Demand Side Actions Supply Side/ Operational Actions Communications Key Message and Actions position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within operational rules Use the water that you need but please don’t levels. and within quality constraints waste it Ongoing leakage maintenance and water efficiency General Water Efficiency Campaigns via work streams. - Radio Preplanning for the implementation of ‘Media - Education Centres Campaign with Water Efficiency Device Offering’ and ‘Enhanced Leakage Management’ option. - Water Efficiency Web Page Developing Raise and increase awareness of the importance of Commence increased liaison with operational colleagues Use what you need but please don’t waste water. Drought water conservation measures through the established and NRW in line with Management and Communications

media campaigns as per the communication plan Plan. We increasingly need your help to conserve water which will include requests for voluntary restraint. Conserve Alwen stocks by optimising abstraction from supplies. Progress ‘Media Campaigns with Water Efficiency Poulton (Bretton WTW) subject to agreed limit specified in Device Offering’ option Dee General Directions We are also doing our bit by ensuring we fix leaks Undertake ‘Enhanced Leakage Management’ option Consideration to be given at this stage to cutback of Alwen quickly to prevent waste reservoir compensation release as per supply-side 8014.D1 if Supply / demand situation continually monitored Continuation of Normal Activities plus Enhanced conditions allow. throughout the drought situation and the targeted Water Efficiency via: effectiveness of demand-side measures. Introduction of Dee Stage 1 Conditions (triggered by DCL’s - Messaging on the Dee system storage) means part of Welsh Water area Continuation of preceding options. supplied from Bretton would then be supplied from Alwen - Local Radio Preplanning for the implementation of TUBs and Reservoir. Commence increased liaison in line with - Target social media NEUBs. Communications Plan. Review and apply where feasible tankering to support low Prepare and Publish DCWW Drought Web Page resources and/ or from adjacent WRZ. TUB consultation via Printed media Prepare for implementation of Options 8014.D2 - D5.

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Drought Increasing public awareness and content of new Conserve Alwen stocks by optimising abstraction from We’ve introduced a temporary hosepipe ban as a demand-side measures to be included in media Poulton (Bretton WTW) subject to agreed limit specified in last resort to help conserve water supplies campaign and as aligned with the communication Dee General Directions plan.) Further consideration to be given at this stage to cutback of Ask you to respect this to ensure supplies to Introduction of TUBs (Saving of 0 – 5% demand, 0-2.12 Alwen reservoir compensation release as per supply-side people in the area are conserved Mld). Option 1 if conditions allow. Continuation of preceding options. Introduction of the Dee Stage 2 Conditions (triggered by Thank you in advance for your cooperation DCL’s on the Dee system storage) the boreholes at Bretton Preplanning for the implementation of NEUBs. Implement TUBS would be brought into operation to make good the further reduction in licensed quantity at the Poulton abstraction. Continuation of Previous Techniques plus Enhanced messaging via: Implementation as required of options 8012.D2 - D5 - Local Radio Review current operational activities to preserve resource. Continue to review and apply where feasible tankering to - Targeted social Media support low resources and/ or from adjacent WRZ. - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service - Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. Continue with implementation as required of 8012.D2 - 5. Continuation of Previous Activities with the Drought enhanced message Increasing public awareness and content of new demand-side measures to be included in media We appreciate your help so far in observing the campaign and as aligned with the communication temporary use restrictions plan.)

Introduction of NEUBs (Saving of 0 – 5% demand, 0- Water levels are at very low levels so we ask you 0.77 Ml/d). think carefully about the waster you use

Implementation of Emergency Drought Orders as Last Resort (Saving likely 0-10%, 0-4.24 Mld) Urge you not to waste any water Implementation of NEUB: Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers.

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Local Media Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio

Table 6 - Alwen Dee Drought Actions Sequence of Events

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Drought Management Options – Supply Side

8014.D1 - Cutback in Compensation release from Alwen Reservoir

Option Name Cutback in Compensation release from Alwen Reservoir

Location Whole zone Area affected or whole supply zone

Assessment Implementation timetable The practical implementation of the option could be Preparation time, time of year effective, effected within 1 week duration Covered by Dee Operating Manual, no further permissions required. The Dee Operating Manual specifies varying compensation releases from Alwen Reservoir and Llyn Permissions required and constraints Brenig depending on the time of the year, the storage in

OptionImplementation Including details of liaison carried out with both of the reservoirs, the regulation releases from Llyn bodies responsible for giving any permits Brenig and the total Safe Yield of the entire Dee System. or approvals The total compensation from Alwen and Brenig, during the summer, will be 25 Ml/d. The total compensation from Alwen and Brenig, will be 25 Ml/d during the summer, and 13.6 Ml/d during the winter.

Risks associated with option

Risk to the Environment Low; the option is specifically included within the Dee (High/Medium/Low or unknown) Operating Manual. Summary of likely environmental impacts

Include details for features of moderate

and major sensitivity and minor sensitivity features from designated sites

Baseline information used

The option is specifically included within the Dee Summary of additional baseline Operating Manual. As such, a site specific Environmental monitoring requirements Monitoring Plan is not required.

EnvironmentalAssessment Mitigation measures Mitigation measures are not required

Impact on other activities None identified e.g. fisheries, industry etc

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8014.D2 - Utilisation of Llwyn Isaf with temporary WTW

Option Name Utilisation of Llwyn Isaf with temporary WTW

Developing Drought- Prepare for Implementation Trigger(s) Drought- Implementation (or preceding actions) Severe drought- Continue with operation of supply side options

Yield of action 2 Ml/d Ml/day unless stated otherwise Llwyn Isaf is a borehole retained for augmenting the Location River Clwyd and to support refill of Alwen reservoir Area affected or whole supply zone during the winter by supplying potable water to its local area. Implementation timetable The practical implementation a water treatment Preparation time, time of year effective, operation would be within 3 months. duration Existing licence – no permissions required Permissions required and constraints

Including details of liaison carried out with There may be some scope to further utilise this for

OptionImplementation Assessment bodies responsible for giving any permits or direct supply, requiring new raw water mains, treated approvals water mains and a temporary WTW. DWI issue- Source is offline and would require DWI approval to bring back online. Samples will need to be taken over a period to confirm water quality. Risks associated with option Timescales – there is a risk this option could take longer than 3 months to implement due to the engineering implications Risk to the Environment Low; the option would utilise an existing licence. (High/Medium/Low or unknown) Summary of likely environmental impacts

Include details for features of moderate

and major sensitivity and minor sensitivity features from designated sites

Baseline information used

The option would utilise an existing licence, as such, a Summary of additional baseline site specific Environmental Monitoring Plan is not monitoring requirements required.

EnvironmentalAssessment Mitigation measures Mitigation measures are not required

Impact on other activities None identified e.g. fisheries, industry etc

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8014.D3 - Bretton Pumpback

Option Name Bretton Pumpback

Developing Drought- Prepare for Implementation Trigger(s) Drought- Implementation (or preceding actions) Severe drought- Continue with operation of supply side options Yield of action Option will not result in a gain in Yield Ml/day unless stated otherwise Option would relieve the demand on the Alwen Location reservoir and aid recovery of the reservoir storage Area affected or whole supply zone system over the winter months Implementation timetable The option could be implemented effectively Preparation time, time of year effective, immediately to 1 week. duration Permissions required and constraints Including details of liaison carried out with Existing licence – no permissions required. bodies responsible for giving any permits or approvals Bretton WTW is supplied from the Welsh Water abstractions on the River Dee at Poulton and from the

Bretton Boreholes (3 no.), nearby. During the winter months these abstractions are not fully utilised and the abstraction licences have spare resource. Following a dry summer, Alwen reservoir storage may be seriously depleted. If this is the case, then this option Risks associated with option would utilise the spare resource on the abstractions that supply Bretton WTW and pump the water into the network area that is normally supplied by Alwen WTW (and Alwen reservoir). This approach would relieve the demand on the Alwen reservoir and aid recovery of the reservoir storage over the winter months, and in this respect this option will

not result in a gain in Yield as such. OptionImplementation Assessment Risk to the Environment Low: the option would utilise an existing licence within (High/Medium/Low or unknown) licensed quantities. Summary of likely environmental impacts Include details for features of moderate

and major sensitivity and minor sensitivity features from designated sites

Baseline information used

The option would utilise an existing licence within Summary of additional baseline licensed quantities, as such, a site specific monitoring requirements Environmental Monitoring Plan is not required.

Mitigation measures Mitigation measures are not required

Impact on other activities None identified

e.g. fisheries, industry etc EnvironmentalAssessment

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8014.D4 - Reinstate Llyn Bran with temporary WTW

Option Name Reinstate Llyn Bran with temporary WTW

Developing Drought- Prepare for Implementation Trigger(s) Drought- Implementation Severe drought- Continue with operation of supply (or preceding actions) side options 1.45 Ml/d Yield of action

Ml/day unless stated otherwise This option would reinstate the reservoir by providing Location a temporary WTW that would supply the existing distribution system in the Denbigh area Area affected or whole supply zone The practical implementation of the option could be Implementation timetable effected within 3 months (but see option constraints and risks below). Preparation time, time of year effective, duration Existing licence – Planning permission may be required Permissions required and constraints but no other permissions are required.

Including details of liaison carried out with Llyn Bran is a small reservoir adjacent to Llyn Brenig. bodies responsible for giving any permits This option would reinstate the reservoir by providing or approvals a temporary WTW that would supply the existing distribution system in the Denbigh area. New raw OptionImplementation Assessment water mains, treated water mains and a new power supply to a temporary pumping station would also be required. A containerised WTW would need to be purchased and on standby to enable this option to be implemented within the timeframes associated with drought response. DWI issue: This is an abandoned source therefore we Risks associated with option would require DWI approval to proceed following sampling period. There may also be insufficient power supply in the area for the temporary works. Timeframe: Depending on the drought situation it may not be possible to implement this option in the timeframes associated with the required drought response. Low; the option would utilise an existing licence.

Risk to the Environment

(High/Medium/Low or unknown)

Summary of likely environmental impacts

Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites

Baseline information used EnvironmentalAssessment The option would utilise an existing licence, as such, a Summary of additional baseline site specific Environmental Monitoring Plan is not monitoring requirements required.

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Mitigation measures are not required Mitigation measures

None identified Impact on other activities

e.g. fisheries, industry etc

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8014.D5 - Utilisation of Cilcain Reservoirs

Option Name Utilisation of Cilcain Reservoirs

Developing Drought- Prepare for Implementation Trigger(s) Drought- Implementation (or preceding actions) Severe drought- Continue with operation of supply side options

Yield of action 0.5 Ml/d Ml/day unless stated otherwise Welsh Water retains mothballed reservoirs at Cilcain Location but the WTW has been decommissioned. In the event Area affected or whole supply zone of Stage 2 Conditions a review would take place on how these reservoirs could be made operational. Approximately 6 weeks; dependent on achieving Implementation timetable agreement, mobilising and completion of the Preparation time, time of year effective, engineering task. duration The WTW would require up to 3 months to reinstate. Existing licence – This is an abandoned source Permissions required and constraints therefore we would require DWI approval to proceed Including details of liaison carried out with following sampling period. No FDC required. WTW bodies responsible for giving any permits building still exists, but its suitability for housing a or approvals temporary works is uncertain, therefore assume planning requirement. A containerised WTW would

need to be purchased and on standby to enable this OptionImplementation Assessment option to be implemented within the timeframes associated with drought response.

No further permissions required Risk of objection from anglers in the area. Risks associated with option

Based on previous operation during a drought, it is very unlikely that there will be much resource availability from this source. The compensation requirement alone has in previous droughts been supported from alternative sources. Timeframe: Depending on the drought situation it may not be possible to implement this option in the timeframes associated with the required drought

response.

Risk to the Environment

Low; the option would utilise an existing licence.

ment

Assess mental (High/Medium/LowEnviron or unknown)

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Summary of likely environmental impacts

Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites

Baseline information used

The option would utilise an existing licence, as such, a Summary of additional baseline site specific Environmental Monitoring Plan is not monitoring requirements required.

Mitigation measures Mitigation measures are not required

Impact on other activities Potential for impacts on angling due to drawdowns to both reservoirs e.g. fisheries, industry etc

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Figure 6 - Llyn Alwen Drought Action Zones

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Bala - 8020

Location Plan 4 - Bala Water Resource Zone

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Bala Water Resources No. Location Licence No. Type 1 Llyn Arenig Fawr 24/67/02/0006 Impounding Reservoir Table 7 - Bala abstraction licences

The location of the WRZ is shown on the Welsh Water Area map and the locations of the resources are shown in Location Plan 4. Drought Control Lines have been defined for Llyn Arenig Fawr Reservoir, as shown in Figure 7 and drought actions are given in Table 8.

Current Resource Status In terms of population, this is the smallest of Welsh Water’s WRZs, with some 3,500 customers, although it is subject to growth through tourism particularly during the summer months. The WRZ is served from a single impounding reservoir, Llyn Arenig Fawr. The live storage of the reservoir is 1629 Ml. There is no compensation water requirement and Welsh Water is licensed to abstract 2.27 Ml/d (829.6 Ml/yr). Therefore, Welsh Water has effectively two years worth of authorised abstraction held in storage for this WRZ. In the event of a drought the greater risk is the volume of abstraction exceeding the licensed daily amount rather than the resource failing. During 2012/2013 the average demand in this WRZ was 1.41 Ml/d and the peak week demand was 1.54 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/Operational Actions Communications Key Messages and actions Position

Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, within Use the water that you need but please don’t waste it demand levels. operational rules and within quality General Water Efficiency Campaigns via constraints Ongoing leakage maintenance and water efficiency Radio work streams. Education Centres Preplanning for the implementation ‘Media Campaign with Water Efficiency Device Offering’ Water Efficiency Web Page and ‘Enhanced Leakage Management’ option.

Developing Raise and increase awareness of the importance of Commence increased liaison with operational Use what you need but please don’t waste water. Drought water conservation measures through the colleagues and NRW in line with established media campaigns as per the Management and Communications Plan. We increasingly need your help to conserve water communication plan which will include requests for Review and implement where feasible supplies. voluntary restraint. tankering from neighbouring zone. Progress ‘Media Campaigns with Water Efficiency Preparation for transfer from Dyffryn Conwy We are also doing our bit by ensuring we fix leaks Device Offering’ option WRZ (8020.D2), and for introduction of quickly to prevent waste Undertake ‘Enhanced Leakage Management’ supply side option 8020.D1. Continuation of Normal Activities plus: option Depending on weather and demand, prepare - Enhanced targeted Water Efficiency Messaging Supply / demand situation continually monitored implementation of TUBs throughout the drought situation and the - Commencement of local engagement and educational

effectiveness of demand-side measures. road shows

Continuation of preceding options. - Letter drop

Preplanning for the implementation of TUBs and - Engagement with stakeholders through face to face NEUBs. briefings, direct mail or social media activity Prepare and Publish DCWW Drought Web Page

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TUB consultation via printed media

Drought Increasing public awareness and content of new Implement environmental monitoring in line We’ve had to introduce a temporary hosepipe as a last demand-side measures to be included in media with Monitoring Plan. resort to help conserve water supplies for customers campaign and as aligned with the communication Review current operational activities to Ask you to respect this to ensure supplies to people in plan.) preserve resource. the area are conserved Introduction of TUBs (Saving of 0 – 5% demand 0 – Continue to review and implement where Thank you in advance for your cooperation 0.07 Ml/d). feasible tankering from neighbouring zone. Implement TUBS Continuation of preceding options. Prepare Drought Permit applications. Continuation of Previous Techniques plus Enhanced Preplanning for the implementation of NEUBs. Rezone from Llyn Conwy (Dyffryn Conwy messaging vie: system) (8020.D2) - Local Radio The trigger to implement Drought Permit is - Targeted social Media when demand exceeds the trigger level of historic max demand for the zone - Plus Call Centre Pre recorded Messages

- Targeted messaging through texting service

- Media interviews with Senior Managers produced via TV and Radio

Preparation for NEUB Via Chamber of Commerce and Trade Bodies

Severe Continuation of preceding options. Introduction of supply-side option 8020.D1 Continuation of Previous Activities with the enhanced Drought message Increasing public awareness and content of new demand-side measures to be included in media We appreciate your help so far in observing the campaign and as aligned with the communication temporary use restrictions plan.)

Introduction of NEUBs (Saving of 0 – 5% NHH Water levels are at very low levels so we ask you think demand, 0 – 0.02 Ml/d). carefully about the waster you use

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Implementation of Emergency Drought Orders as last resort (Saving likely 0-10%, 0 – 0.14 Ml/d) Urge you not to waste any water

Implementation of NEUB:

Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers.

- Local Media

- Letter Drop and or Text Service

- Engagement with Chamber of Commerce and Trade Bodies

Preparation for Emergency Drought Orders

Media Campaign

Media Interviews with Senior Managers produced via TV and Radio Table 8 - Bala Drought Actions Sequence of Events

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Drought Management Options – Supply Side

8020.D1 - Llyn Arenig Fawr: Relaxation of daily licence conditions and mobilisation of temporary water treatment plant Llyn Arenig Fawr: Relaxation of daily licence conditions and Option Name mobilisation of temporary water treatment plant Drought: Prepare Drought Permit applications Trigger(s) Severe drought: Introduction of supply side option (or preceding actions) 0.3 Ml/d Yield of action

Ml/day unless stated otherwise Whole supply zone Location

Area affected or whole supply zone We assume a decision from Natural Resources Wales within 14 Implementation timetable days of submitting the drought permit application. Preparation time, time of year The practical implementation of the option could be effected effective, duration within 3 months. The option is most likely to be implemented during the summer. The drought permit would be in place for up to 6 months. Drought Permit - NRW Permissions required and constraints

OptionImplementation Assessment Planning consent required for temporary works Including details of liaison carried out with bodies responsible for giving any permits or approvals Non granting of the Drought Permit by NRW. Risks associated with option The daily licence quantity of 2.27 Ml/d would be increased to approx 2.6 Ml/d. This would require a temporary treatment plant to be made available. Timescales – there is a risk this option could take longer than 3 months to implement due to the engineering implications

Risk to the Environment Low (High/Medium/Low or unknown) An Environmental Monitoring Plan (EMP) was prepared for this Summary of likely environmental drought permit in 2009. The EMP does not constitute an impacts Environmental Assessment Report (EAR) which would describe Include details for features of the potential impacts of drought permit implementation on moderate and major sensitivity and sensitive features. However, the EMP does present a hydrological minor sensitivity features from

EnvironmentalAssessment designated sites assessment which lists the likely impacts of drought permit

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implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The drought permit will marginally increase the rate of drawdown of Llyn Arenig Fawr, however only live storage will be utlilised and this is within the licence conditions, and no impacts on this waterbody have been identified. The hydrological impacts are associated with the delay to spilling of the reservoir to the downstream watercourses. The zone of hydrological influence of drought permit implementation includes two reaches, the Llyn Arenig Fawr outflow channel (0.45km, minor hydrological impact) and the Nant Aberderfel, from the Llyn Arenig Fawr outflow channel to Llyn Celyn (2.27km, minor hydrological impact). Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates macrophytes, fish (including brown trout, eel and brook lamprey and gwyniad in Llyn Arenig Fawr) are not anticipated to be significant. The EMP identified that, in the absence of survey data, freshwater pearl mussel may be present within zone of hydrological influence of the drought permit. However, it is noted that there is no statutory compensation release to the watercourse from the reservoir and during dry periods, flow in the watercourses is negligible or very low. Therefore, it is considered unlikely that freshwater pearl mussels would have survived in this watercourse, and no impacts on this species are anticipated.

Llyn Arenig Fawr is located within the Migneint-Arenig-Dduallt SAC, SPA and SSSI. The sites are designated primarily for blanket bog and dry heaths. Llyn Arenig Fawr is an oligotrophic lake and hence part of the ‘oligotrophic to mesotrophic standing waters’ feature or the SAC designation. Abstraction from this reservoir is recognised as part of the SAC designation and there is a negligible hydrological impact anticipated for Llyn Arenig Fawr. No significant effects of drought permit implementation are anticipated on the SAC, SPA and SSSI. An EMP was prepared for this drought option in 2009 and utilised Baseline information used available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought permit was agreed by DCWW and NRW Summary of additional baseline (then Environment Agency Wales and CCW). The EMP monitoring requirements recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought

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permit for: Llyn Arenig Fawr: reservoir level, biochemical water quality, fish (including lamprey) and macrophytes (Including Littorelletea uniflorae). Llyn Arenig Fawr outflow channel & Nant Aberderfel: Biochemical water quality, fish (including lamprey), macroinvertebrates and macrophytes species. However, the EMP was prepared on a precautionary basis, and following preparation of an EAR, all of the monitoring specified in the EMP may not be required. The EMP identified the following mitigation measures for the Llyn Mitigation measures Arenig Fawr outflow channel and Nant Aberderfel: Flow deflectors may be used to ensure gravel remains silt free, if identified as required, fish rescue in consultation with NRW and/or restocking using off spring of broodstock from the catchment and (if present) removal of freshwater pearl mussels to a hatchery. The EMP identified the following mitigation measures for Llyn Arenig Fawr: aeration of the reservoir if temperatures and oxygen levels become prohibitive for survival of the species and if required, the removal of Gwyniad to suitable holding facilities could be considered in consultation with NRW. No significant impacts on landscape and visual amenity, Impact on other activities recreation (including angling) and archaeology and cultural e.g. fisheries, industry etc heritage are anticipated.

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8020.D2 - Transfer of water from Llyn Conwy system (Dyffryn Conwy WRZ) Option Name Transfer of water from Llyn Conwy system (Dyffryn Conwy WRZ) Trigger(s) Developing Drought: Engineering preparation of replacement (or preceding actions) 1km of 2”UPVC main with 110mm. Drought: Rezone from Llyn Conwy (Dyffryn Conwy system) Yield of action 0.2 Ml/d Ml/day unless stated otherwise

Location Dyffryn Conwy WRZ Area affected or whole supply zone Implementation timetable The practical implementation of the option could be effected Preparation time, time of year effective, within 4 weeks. duration Permissions required and constraints None Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option There will be a need to replace 1Km of 2”UPVC main with 110mm that will enable the transfer from Dyffryn Conwy WRZ Timescales – there is a risk this option could take longer than 4

weeks to implement due to possible engineering implications OptionImplementation Assessment Risk to the Environment (High/Medium/Low or unknown) Unknown

Summary of likely environmental impacts Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites

Baseline information used

Summary of additional baseline monitoring requirements Mitigation measures

Impact on other activities

e.g. fisheries, industry etc EnvironmentalAssessment

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Llyn Arenig Fawr Drought Action Zones

100

NORMALOPERATION 90

80 DEVELOPING DROUGHT

70 DROUGHT 60

40 Reservoir StorageReservoir (%) SEVERE DROUGHT 30

10 EMERGENCY STORAGE

Figure 7- Llyn Arenig Fawr Drought Action Zones

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Tywyn Aberdyfi – 8021

Location Plan 5 - Tywyn/ Aberdyfi Water Resource Zone

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Tywyn – Aberdyfi Water Resources No. Location Licence No. Type 1 Afon Fathew 23/64/13/0031 River Abstraction – Pumped 2 Nant Braich Y Rhiw 23/64/13/0032 River Abstraction - Gravity Table 9- Tywyn/ Aberdyfi abstraction licences

The location of the WRZ is shown on the Welsh Water Area map and the locations of the resources are shown in Location Plan 5. Drought actions for the WRZ are given in Table 10. Current Resource Status The two sources supplying this WRZ deliver raw water to Penybont WTW, which then serves the whole of the Tywyn/ Aberdyfi WRZ. The Nant Braich y Rhiw source is subject to a Hands-Off-Flow condition that comes into operation during most summer periods. The abstraction from the Afon Fathew is licensed to abstract a quantity equivalent to the treatment works capacity of 2.6 Ml/d and this volume of water is known to be available under drought conditions. During 2012/2013 the average demand in this WRZ was 1.34 Ml/d and the peak week demand was 1.93 Ml/d.

Tywyn Aberdyfi Drought Action Zones

3.00

2.50

2.00

1.50 Mld

1.00

Normal operation 0.50

0.00

Developing drought zone Drought to severe drought zone

Figure 8 - Tywyn Aberdyfi Drought Action Zones

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- Local Radio Supply / demand situation continually monitored throughout the drought situation and the - Target social media effectiveness of demand-side measures. - Prepare and Publish DCWW Drought Web Page Continuation of preceding options. TUB consultation via Printed media Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Implement environmental monitoring in line with We’ve introduced a temporary hosepipe ban as a demand-side measures to be included in media Monitoring Plan. last resort to help conserve water supplies campaign and as aligned with the communication Review current operational activities to preserve Ask you to respect this to ensure supplies to plan.) resource. people in the area are conserved Introduction of TUBs (Saving of 0 – 5% demand, 0 – Prepare Drought Permit applications for options Thank you in advance for your cooperation 0.07 Ml/d). 8021.D1 & D2. Implement TUBS Continuation of preceding options. Consideration will be given to supporting this WRZ Continuation of Previous Techniques plus Preplanning for the implementation of NEUBs. by tankering from the adjoining South Meirionnydd

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WRZ. Enhanced messaging via: - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. Introduction of supply side 8021.D1 Continuation of Previous Activities with the Drought enhanced message Increasing public awareness and content of new Monitor abstractions and introduce supply-side demand-side measures to be included in media option 8021.D2 if necessary. We appreciate your help so far in observing the campaign and as aligned with the communication temporary use restrictions plan.) Water levels are at very low levels so we ask you Introduction of NEUBs (Saving of 0 – 5% demand, 0 think carefully about the waster you use – 0.02 Ml/d). Urge you not to waste any water Implementation of Emergency Drought Orders as Implementation of NEUB Last Resort (Saving likely 0-10%, 0 – 0.13 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 10 - Tywyn/ Aberdyfi Drought Actions Sequence of Events

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Drought Management Options

8021.D1 - New abstraction (tankering) from Afon Dysynni at Pont y Garth (to Pen y Bont WTW) Option Name New abstraction (tankering) from Afon Dysynni at Pont y Garth (to Pen y Bont WTW)

Trigger(s) Drought- Prepare Drought Permit applications (or preceding actions) Severe Drought- Introduction of option Yield of action 0.3 Ml/d

Ml/day unless stated otherwise

Location Whole Supply Zone Area affected or whole supply zone The new abstraction, from the Afon Dysynni in the Pont y Garth area, will transfer raw water by means of tankers to Penybont WTW. According to the EAW Meirionnydd CAMS, the Afon Dysynni is classified as having ‘Water Available’. A temporary tankering hardstanding would be required at the Dysynni abstraction point, along with an inlet point at Penybont WTW. Implementation timetable We assume a decision from NRW within 14 days of Preparation time, time of year submitting the Drought Permit application. effective, duration The practical implementation of the option could be effected

within 2 weeks. OptionImplementation Assessment Permissions required and constraints Drought Permit-NRW Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved Timescales – there is a risk this option could take longer than 2 weeks to implement due to unforseen engineering implications Risk to the Environment Unknown. This option has been determined during the draft (High/Medium/Low or unknown) drought plan process. The Generic Environmental Plan will be applied to this site, and a site specific Environmental Monitoring Plan will be produced with a Drought Plan review. Summary of likely environmental impacts Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites Baseline information used

EnvironmentalAssessment Summary of additional baseline monitoring requirements Mitigation measures

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Impact on other activities e.g. fisheries, industry etc

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8021.D2 - Relaxation of annual licences on the Afon Fathew and the Nant Braich Y Rhiw Option Name Relaxation of annual licences on the Afon Fathew and the Nant Braich Y Rhiw Trigger(s) Drought- Prepare Drought Permit applications (or preceding actions) Severe Drought- Monitor abstractions and introduce supply- side option 2 if necessary. Yield of action 0 Ml/d Ml/day unless stated otherwise The Drought Permit will allow continued abstraction should demands cause Penybont WTW to operate at higher than normal levels.

Location Whole Supply Zone Area affected or whole supply zone Implementation timetable We assume a decision from NRW within 14 days of Preparation time, time of year submitting the Drought Permit application. effective, duration The practical implementation of the option could be effected within 1 week. Permissions required and constraints Drought Permit-NRW Including details of liaison carried out with bodies responsible for giving any permits or approvals

Risks associated with option The application, as applied for, is not approved OptionImplementation Assessment Risk to the Environment Unknown. This option has been determined during the draft (High/Medium/Low or unknown) drought plan process. The Generic Environmental Plan will be applied to this site, and a site specific Environmental Monitoring Plan will be produced with a Drought Plan review. Summary of likely environmental Unknown impacts Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites

Baseline information used

Summary of additional baseline monitoring requirements

Mitigation measures

Impact on other activities

e.g. fisheries, industry etc EnvironmentalAssessment

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Blaenau Ffestiniog - 8026

Location Plan 6 - Blaenau Ffestiniog Water Resource Zone

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Blaenau Ffestiniog Water Resources

No. Location Licence No. Type 1 Llyn Morwynion 23/65/01/0002 Impounding Reservoir 2 Afon Gam 23/65/01/0034 River Abstraction - Gravity Table 11 - Blaenau Ffestiniog abstraction licences

The location of the WRZ is shown on the Welsh Water Area map and the locations of the resources are shown in Location Plan 6. Drought Control Lines have been defined for Llyn Morwynion Reservoir, as shown in Figure 9 and drought actions are given in Table 12 .

Current Resource Status The WRZ is reliant on Llyn Morwynion with the option to use the river abstraction from the River Gam to augment winter refill. This latter facility has only been available since the abstraction licence was obtained in September 1996. The live storage of Llyn Morwynion is 506 Ml. Welsh Water is licensed to abstract 3.8 Ml/d (1095 Ml/yr), whilst the river abstraction from the Gam is licensed for 4.5 Ml/d (700 Ml/yr). There is no compensation requirement. The current licence authorises the use of the Afon Gam transfer from the 1st October each year should it be required. There are a number of licence conditions attached to the use of this refill during October, which are dependent upon rainfall events in the previous weeks. It is considered that for drought planning scenarios we cannot assume the rainfall conditions will be satisfied in October and we have presumed that the Afon Gam refill will not be available until 1st November. The existing licence for Llyn Morwynion authorises the pumping of the Dead Storage (considered to be 116 Ml). This provision effectively increases the available storage in Morwynion without the need for Drought Permit powers. However, modelling of the system shows that in dry years the annual abstraction licence would be fully utilised before the Emergency Storage, or the Dead Storage, could be used. Therefore, Drought Options have been included to temporarily increase the annual abstraction licence. During 2012/2013 the average demand in this WRZ was 1.65 Ml/d and the peak week demand was 1.97 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications Key Message Position Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, Use the water that you need but please don’t waste it demand levels. within operational rules and within General Water Efficiency Campaigns via: quality constraints Ongoing leakage maintenance and water Radio efficiency work streams. Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ Water Efficiency Web Page and ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance Commence increased liaison with Use what you need but please don’t waste water Drought of water conservation measures through the operational colleagues and NRW in We increasingly need your help to conserve water supplies established media campaigns as per the line with Management and communication plan which will include requests Communications Plan. We are also doing our bit by ensuring we fix leaks quickly to for voluntary restraint. prevent waste Review and implement where Progress ‘Media Campaigns with Water Efficiency feasible tankering from Continuation of Normal Activities plus: Device Offering’ option neighbouring zone. - Enhanced targeted Water Efficiency Messaging Undertake ‘Enhanced Leakage Management’ option - Commencement of local engagement and educational road shows Supply / demand situation continually monitored throughout the drought situation and the - Letter drop effectiveness of demand-side measures. - Engagement with stakeholders through face to face briefings, Continuation of preceding options. direct mail or social media activity Preplanning for the implementation of TUBs and Prepare and Publish DCWW Drought Web Page NEUBs. TUB consultation via printed media Drought Increasing public awareness and content of new Review current operational We’ve introduced a temporary hosepipe ban as a last resort to demand-side measures to be included in media activities to preserve resource. help conserve water supplies campaign and as aligned with the communication Continue to review and implement Ask you to respect this to ensure supplies to people in the area plan.) where feasible tankering from are conserved Introduction of TUBs (Saving of 0 – 5% demand, 0 neighbouring zone. Thank you in advance for your cooperation – 0.08 Ml/d). Prepare Drought Permit Implement TUBS Continuation of preceding options. application.

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Preplanning for the implementation of NEUBs. Prepare implementation of supply- Continuation of Previous Techniques plus Enhanced messaging side 8026.D1. via: - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service - Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. In the event that storage declines Continuation of Previous Activities with the enhanced message Drought into the Severe Drought area of the Increasing public awareness and content of new We appreciate your help so far in observing the temporary use Morwynion Drought Diagram this demand-side measures to be included in media restrictions area would be supported by campaign and as aligned with the communication tankering (1 week implementation Water levels are at very low levels so we ask you think plan.) time). carefully about the waster you use Introduction of NEUBs (Saving of 0 – 5% NHH Drought Permit solutions would be Urge you not to waste any water demand, 0 – 0.01. Ml/d). sought for supply side option Implementation of NEUB: Implementation of Emergency Drought Orders as 8026.D1 Last Resort (Saving likely 0-10%, 0 – 0.16 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service - Engagement with Chamber of Commerce and Trade Bodies - Preparation for Emergency Drought Orders - Media Campaign - Media Interviews with Senior Managers produced via TV and Radio Table 12 - Blaenau Ffestiniog Drought Actionas Sequence of Events

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Drought Management Options - Supply Side

8026.D1 - Pumped abstraction of Dead Storage from Llyn Morwynion, and increase annual abstraction licence to fully utilise Emergency Storage volume Option Name Pumped abstraction of Dead Storage from Llyn Morwynion, and increase annual abstraction licence to fully utilise Emergency Storage volume Trigger(s) Drought- Prepare implementation of supply-side option 8026.D1 (or preceding actions) Severe Drought - Drought Permit solutions would be sought for supply side Option 8026.D1 Yield of action 0.36 Ml/d Ml/day unless stated otherwise

Location Whole supply zone Area affected or whole supply zone Implementation timetable We assume a decision from NRW within 14 days of submitting the Preparation time, time of year Drought Permit application. effective, duration The practical implementation of the option could be effected within 4 weeks depending on the quality of the water from the

Dead Storage zone.

The drought permit can only occur during the autumn and winter period as there is no ability to exceed the annual licence condition before mid-October and it annually resets on 1 January. Drought permits are valid for up to 6 months. Permissions required and Drought Permit- NRW constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved.

OptionImplementation Assessment Modelling of the WRZ has shown that in very dry years the annual abstraction licence (1,095 Ml/yr) would be fully used before the Emergency Storage volume could be utilised. The Emergency Storage volume is estimated at 80.1 Ml. The used portion of the annual licence in dry years is estimated at 66.9 Ml. Therefore, to fully utilise the Emergency Storage an increase in annual licence of approximately 14 Ml would be required. Whilst the existing abstraction licence authorises the pumping of the Dead Storage volume the annual abstraction licence would be fully utilised before the storage could be used, as mentioned above. The Dead Storage is estimated at 116 Ml; therefore, the annual abstraction licence would need to be increased by this volume (in addition to the 14 Ml required for the Emergency Storage). This would be a total increase in annual abstraction licence of approximately 130 Ml. This would provide approximately 44 days additional supply.

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Risk to the Environment (High/Medium/Low or Low unknown) Summary of likely An Environmental Monitoring Plan (EMP) was prepared for this environmental impacts drought permit in 2009. The EMP does not constitute an Include details for features of Environmental Assessment Report (EAR) which would describe the moderate and major sensitivity potential impacts of drought permit implementation on sensitive and minor sensitivity features features. However, the EMP does present a hydrological from designated sites assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The drought permit will increase the rate of drawdown of Llyn Morwynion, however it is recognised that Llyn Morwynion can be emptied under normal operating conditions. The hydrological impacts are associated with the delay to spilling of the reservoir to the downstream watercourses. The zone of hydrological influence of drought permit implementation includes two reaches, the Nant Llyn-Morwynion (3.2km, minor hydrological impact due to a delay in spill from the reservoir) and the Afon Teigl (2.4km, minor hydrological impact due to reduced contributions from the Nant Llyn-Morwynion). Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates, macrophytes, fish (including brown trout, eel and brook lamprey) are not anticipated to be significant. Llyn Morwynion is part of the Migneint-Arenig-Dduallt SAC, SPA and SSSI. However, current licence conditions allow Llyn Morwynion to be emptied under normal operating conditions, and

EnvironmentalAssessment no significant effects on designated sites are anticipated. Baseline information used An EMP was prepared for this drought option in 2009 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional The EMP for this drought permit was agreed by DCWW and NRW baseline monitoring (then Environment Agency Wales and CCW). The EMP requirements recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: Llyn Morwynion: reservoir level, biochemical water quality, fish (including salmonids, eel and lamprey) and macrophytes (Including Littorelletea uniflorae). Nant Llyn-Morwynion/Afon Teigl: biochemical water quality, fish (including salmonids, eel and lamprey), macroinvertebrates and macrophytes. Mitigation measures The EMP identified the following mitigation measures for the Nant Llyn-Morwynion/Afon Teigl: Physical modification to existing structures that could present as barriers to fish migration, capture and relocation of fish upstream of migratory barriers, flow deflectors may be used to ensure gravel remains silt free, if identified as required and, if required, fish rescue in consultation with NRW and/or restocking using off spring

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of broodstock from the catchment. The EMP identified the following mitigation measures for Llyn Morwynion: Aeration of the reservoir if temperatures and oxygen levels become prohibitive for survival of the species and if required, and, if required, fish rescue in consultation with NRW and/or restocking of coarse fish. Impact on other activities No significant impacts on landscape and visual amenity, recreation e.g. fisheries, industry etc (including angling) and archaeology and cultural heritage are anticipated.

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Llyn Morwynion Drought Action Zones 100

90 NORMALOPERATION DEVELOPING DROUGHT 80

DROUGHT 70

SEVERE DROUGHT

40 ReservoirStorage (%)

10 EMERGENCY STORAGE

Figure 9- Llyn Morwynion Drought Action Zones

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Barmouth - 8033

Location Plan 7 - Barmouth Water Resource Zone

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Barmouth Water Resources

No. Location Licence No. Type

1 Llyn Bodlyn 23/64/15/0009 Impounding reservoir Table 13 - Barmouth abstraction licences

The location of the WRZ is shown on the Welsh Water Area map and the locations of the resources are shown in Location Plan 7. Drought Control Lines have been defined for Llyn Bodlyn Reservoir, as shown in Figure 10 and drought actions are given in Table 14. Current Resource Status This small WRZ is served from a single impounding reservoir at Llyn Bodlyn. The live storage of the reservoir is 439 Ml. Welsh Water is licensed to abstract 3 Ml/d (980 Ml/yr), with a daily compensation release of 2.18 Ml/d. The licence also allows for peak abstractions of up to 3.5 Ml/d during any 14 days of the year. Peak demands during dry periods often reach the daily abstraction licence limit. Although there would be no resource problem during most years, critical droughts could severely deplete storage. During 2012/2013 the average demand in this WRZ was 1.50 Ml/d and the peak week demand was 2.31 Ml/d. Since March 2010 it has been possible to support the Barmouth WRZ from Rhiwgoch WTW in the Lleyn Harlech WRZ. This is following capital investment to resolve supply demand issues in the Barmouth zone.

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Drought Actions – Sequence of Events

Resource Demand Side Actions Supply Side/Operational Actions Communications Key Message Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within operational Use the water that you need but please don’t waste it levels. rules and within quality constraints General Water Efficiency Campaigns via: Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation ‘Media Campaign with Water Efficiency Device Offering’ and ‘Enhanced - Water Efficiency Web Page Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison with operational Use what you need but please don’t waste water. Drought water conservation measures through the established colleagues and NRW in line with Management and We increasingly need your help to conserve water supplies. media campaigns as per the communication plan Communications Plan. which will include requests for voluntary restraint. We are also doing our bit by ensuring we fix leaks quickly to Review and implement where feasible transfer from prevent waste Progress ‘Media Campaigns with Water Efficiency Rhiwgoch WTW in Lleyn Harlech zone. Device Offering’ option Continuation of Normal Activities plus: Prepare implementation of supply side option Undertake ‘Enhanced Leakage Management’ option 8033.D1. - Enhanced targeted Water Efficiency Messaging Supply / demand situation continually monitored - Commencement of local engagement and educational road shows throughout the drought situation and the effectiveness of demand-side measures. - Letter drop Continuation of preceding options. - Engagement with stakeholders through face to face briefings, direct mail or social media activity Preplanning for the implementation of TUBs and NEUBs. Prepare and Publish DCWW Drought Web Page TUB consultation via printed media Drought Increasing public awareness and content of new Implement environmental monitoring in line with We’ve introduced a temporary hosepipe ban as a last resort to help demand-side measures to be included in media Monitoring Plan conserve water supplies campaign and as aligned with the communication Review current operational activities to preserve Ask you to respect this to ensure supplies to people in the area are plan.) resource. conserved Introduction of TUBs (Saving of 0 – 5% demand, 0 – Continue to review and implement where feasible Thank you in advance for your cooperation

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0.07 Ml/d). transfer from Rhiwgoch WTW in Lleyn Harlech zone. Implement TUBS Continuation of preceding options. Prepare Drought Order/ Permit applications for Continuation of Previous Techniques plus Enhanced messaging via: supply-side Options 1 & 2. Preplanning for the implementation of NEUBs. - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service - Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. If demand remains above 2.8 Ml/d and reservoir Continuation of Previous Activities with the enhanced message Drought storage moves into the Severe Drought zone on the Increasing public awareness and content of new We appreciate your help so far in observing the temporary use Bodlyn Drought Diagram with restrictions in force, a demand-side measures to be included in media restrictions further reference will be made to the Welsh Water campaign and as aligned with the communication Executive to consider application for Drought Permit(s) Water levels are at very low levels so we ask you think carefully plan.) for both of the supply side options 8033.D1 and D2. about the waster you use Introduction of NEUBs (Saving of 0 – 5% demand, 0 - Urge you not to waste any water 0.03 Ml/d). Implementation of NEUB: Implementation of Emergency Drought Orders as Last Resort (Saving likely 0-10%, 0 – 0.15 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service - Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 14 - Barmouth Drought Actions Sequence of Events

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Drought Management Options – Supply Side

8033.D1 - Pumped abstraction of Dead Storage from Llyn Bodlyn Option Name Pumped abstraction of Dead Storage from Llyn Bodlyn

Trigger(s) Developing Drought- Prepare implementation (or preceding actions) Drought- Prepare Drought Order/ Permit applications Severe drought- If demand remains above 2.8 Ml/d and reservoir storage moves into the Severe Drought zone on the Bodlyn Drought Diagram with restrictions in force, a further reference will be made to the Welsh Water Executive to consider application for Drought Permit(s) for both of the supply side options 1 and 2. Yield of action 0.5 Ml/d Ml/day unless stated otherwise

Location Whole Zone Area affected or whole supply zone Implementation timetable We assume a decision from NRW within 14 days of Preparation time, time of year effective, submitting the Drought Permit application. duration The practical implementation of the option could be effected within 4 weeks depending on the quality of the water from the Dead Storage zone. The option is most likely to be implemented during the late summer and autumn period, although it could be implemented at any time during the year. Drought orders are valid for up to 6 months. The volume of Dead Storage is estimated to be 284 Ml. The gain of 0.5 Ml/d is derived from an assumption of pumping at 3 Ml/d for supply for 60 days. Together with the Compensation Water quantity of 2.18 Ml/d, this

OptionImplementation Assessment would exhaust the Dead Storage in approximately 60 days. Cutting through the Severe Drought curve on 1st September will leave sufficient live storage to sustain demands to 12th September. 60 days usage of the Dead Storage would cover demands to around 12th November. Hence it is likely that Option 2 will be needed in addition to Option 1.

Permissions required and constraints Drought Permit- NRW Including details of liaison carried out with Should storage continue to be drawn down permissions bodies responsible for giving any permits or and operational preparations should be made to pump approvals the dead storage into the lowest of the reservoir off- takes. Whilst preparation for this option can proceed it is not possible to put it into operation until such time as storage is physically reduced down to the dead storage level. Pumps and pipeline required

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Risks associated with option The application, as applied for, is not approved.

Risk to the Environment (High/Medium/Low or unknown) Medium Summary of likely environmental impacts An Environmental Assessment Report (EAR) has been Include details for features of moderate prepared for this drought option, however it is and major sensitivity and minor sensitivity understood that NRW have outstanding issues with the features from designated sites assessment presented in the EAR. Pumped abstraction of dead storage from Llyn Bodlyn is not anticipated to have impacts on the Afon Ysgethin, providing there are no changes to the compensation flow regime in the river. Llyn Bodlyn supports a significant population of Artic charr and a rare species of aquatic plant, Luronium natans has also recently been recorded. It is considered likely that lake drawdown will result in significant impacts on Arctic charr and Luronium natans, which are species of conservation interest and concern. Baseline information used The Environmental Assessment Report prepared in 2012 utilised available information from surveys and investigations undertaken by DCWW and NRW. In addition, a programme of environmental monitoring was

undertaken in 2012 and included fisheries hydroacoustic survey of Llyn Bodlyn. Summary of additional baseline The Environmental Monitoring Plan (EMP) sets out the monitoring requirements monitoring that would be required if a drought order is implemented, and is presented in the EAR. The EMP recommended baseline monitoring, and monitoring that should be undertaken at Llyn Bodlyn during implementation of a drought order for; reservoir levels, physico-chemical water quality. Following drought

EnvironmentalAssessment order implementation, monitoring of fish and macrophytes was recommended in Llyn Bodlyn. Mitigation measures Mitigation measures were identified in the EAR. These include: A minimum level should be set within the ‘dead storage’ zone to protect fish species and macrophytes, artificial aeration should be deployed within the reservoir and fish rescue should be undertaken, should it be identified as required. Impact on other activities The EAR identified no significant adverse impacts on other e.g. fisheries, industry etc activities including; landscape and visual amenity, recreation (including angling) and archaeology and cultural heritage. The effects of the reservoir being drawn down to low levels will have a possible impact on fish/ ecology resident within the reservoir and to a secondary extent on the ecology of the Nant Ysgethin which receives the spill from Bodlyn. The potential impact on the Ysgethin reflects the delay to reservoir refill and spill as storage would start from a lower base position. This aspect is covered in detail in the Environmental Monitoring Plan (N8).

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8033.D2 - Reduce compensation water releases from Llyn Bodlyn Option Name Reduce compensation water releases from Llyn Bodlyn

Location Whole WRZ Area affected or whole supply zone Implementation timetable We assume a decision from WG within 28 days of Preparation time, time of year effective, submitting the Drought Order application. duration The practical implementation of the option could be effected within 1 week. The option is most likely to be implemented during the late summer and autumn period, although it could be implemented at any time during the year. Drought orders are valid for up to 6 months.

Permissions required and constraints Drought Order- WG Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved.

The volume of compensation water to be discharged, as specified by the Barmouth Local Board Act 1891, is 2.18 Ml/d. This is similar to the quantity Welsh Water is licensed to abstract (3 Ml/d). There will be a possible impact on fish/ ecology of the Nant Ysgethin. This aspect is covered in more detail in the

Environmental Monitoring Plan (N8). OptionImplementation Assessment Risk to the Environment Medium (High/Medium/Low or unknown)

Summary of likely environmental impacts An Environmental Assessment Report (EAR) has been

Include details for features of moderate prepared for this drought option, however it is understood and major sensitivity and minor sensitivity that NRW have outstanding issues with the assessment features from designated sites presented in the EAR. The lower reach of the Afon Ysgethin (within of the zone of influence of the drought order), flows through an important conservation area which is designated as both an SAC and SSSI (Coedydd Derw a Safleoedd Ystlumod Merion SAC and Coed Cors y Gedol SSSI). The SAC is designated for old sessile oak woods, Alluvial forest,

Callitricho-Batrachion vegetation. EnvironmentalAssessment

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The EAR concluded no significant impacts of the drought order on all ecological receptors. However, the drought order includes a reduction in compensation flow in the river by 45%, delay to refill and spill of up to 1.5 months, and migratory salmonids (salmon and sea trout) are present in the Afon Ysgethin (although access for upstream migratory fish may be restricted to the lower reaches of the river). Low flows and delay to spill are likely to occur during upstream migratory periods, and therefore, impacts on these receptors are anticipated to be significant. The potential for impacts of drought order implementation on the Coedydd Derw a Safleoedd Ystlumod Merion SAC and Coed Cors y Gedol SSSI was assessed in the EAR, which concluded no likely significant effects on the SAC or SSSI. Baseline information used The Environmental Assessment Report prepared in 2012 utilised available information from surveys and investigations undertaken by DCWW and NRW. In addition, a programme of environmental monitoring was undertaken in 2012. Summary of additional baseline The Environmental Monitoring Plan (EMP) sets out the monitoring requirements monitoring that would be required if a drought order is implemented, and is presented in the EAR. The EMP recommended baseline monitoring, and monitoring that should be undertaken at the Afon Ysgethin during and after implementation of a drought order for; river flows, physico-chemical water quality, fish, macrophyte and macroinvertebrate species. Mitigation measures Mitigation measures were identified in the EAR. These include: Isolated freshet release to address any water quality issues in the Afon Ysgethin and fish rescue should be undertaken, should it be identified as required. Impact on other activities The EAR identified no significant adverse impacts on other e.g. fisheries, industry etc activities including; landscape and visual amenity, recreation (including angling) and archaeology and cultural heritage.

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Llyn Bodlyn Reservoir Drought Action Zones 100

90 NORMALOPERATION

DEVELOPING DROUGHT 80

DROUGHT 70

SEVERE DROUGHT 60

50 EMERGENCY STORAGE

40 Reservoir StorageReservoir (%)

30 DEAD STORAGE

01/01 15/01 05/02 19/02 05/03 26/03 09/04 30/04 14/05 28/05 18/06 02/07 06/08 20/08 10/09 24/09 08/10 29/10 12/11 03/12 17/12 31/12 08/01 22/01 29/01 12/02 26/02 12/03 19/03 02/04 16/04 23/04 07/05 21/05 04/06 11/06 25/06 09/07 16/07 23/07 30/07 13/08 27/08 03/09 17/09 01/10 15/10 22/10 05/11 19/11 26/11 10/12 24/12

Figure 10 - Llyn Bodlyn Drought Action Zones

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Lleyn Harlech - 8034

Location Plan 8 - Lleyn/ Harlech Water Resource Zone

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Lleyn/ Harlech Water Resources No. Location Licence No. Type 1 Llyn Eiddew Mawr 23/64/16/0008 Impounding Reservoir 2 Llyn Tecwyn Uchaf 23/65/03/0001 Impounding Reservoir 3 Llyn Cwmystradllyn 23/65/08/0019 Impounding Reservoir 4 Afon Dwyfor 23/65/08/0016 River Abstraction – Pumped – Regulated River 5 Llyn Cwm Dulyn 23/65/14/0002 Impounding Reservoir Table 15 - Lleyn/ Harlech abstraction licences

The location of the WRZ is shown on the Welsh Water Area map and the locations of the resources are shown in Location Plan 8. Drought Control Lines have been defined for Llyn Cwmystradllyn and Llyn Tecwyn Uchaf Reservoirs, as shown in Figure 11 and drought actions are given in Table 16. Current Resource Status The WRZ can be divided into two systems: the northern ‘Lleyn’ system of Llyn Cwmystradllyn, Llyn Cwm Dulyn and Afon Dwyfor the southerly ‘Cilfor – Harlech’ system of Llyn Eiddew Mawr and Llyn Tecwyn Uchaf The operation of Llyn Cwmystradllyn, in combination with the abstraction from the regulated Afon Dwyfor at Dolbenmaen pumping station, is the subject of a Section 20 Operating Agreement with Natural Resources Wales. Llyn Cwmystradllyn storage capacity is 2910 Ml and has a compensation discharge requirement of 3.01 Ml/d. Abstraction from the reservoir is limited to 12.3 Ml/d. Llyn Cwm Dulyn has a storage capacity of 704 Ml and has a compensation discharge requirement of 2.7 Ml/d. Abstraction from the reservoir is limited to 2.9 Ml/d; limited by the associated WTW. The associated abstraction licence at Dolbenmaen is limited to 8.4 Ml/d. The storage in Llyn Eiddew Mawr is 213 Ml and the abstraction licence authorises a maximum of 2.27 Ml/d. The storage in Llyn Tecwyn Uchaf is 619 Ml and the abstraction licence authorises a take of 3.4 Ml/d. During 2012/2013 the average demand in this WRZ was 12 Ml/d and the peak week demand was 15.42 Ml/d. Since March 2010 it has been possible to support the Barmouth WRZ from Rhiwgoch WTW in the Lleyn Harlech WRZ. This is following capital investment to resolve supply demand issues in the Barmouth zone.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within Use the water that you need but please don’t waste it levels. operational rules and within quality constraints General Water Efficiency Campaigns via: Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ and - Water Efficiency Web Page ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison with operational Use what you need but please don’t waste water. Drought water conservation measures through the established colleagues and NRW in line with Management and We increasingly need your help to conserve water supplies. media campaigns as per the communication plan which Communications Plan. will include requests for voluntary restraint. We are also doing our bit by ensuring we fix leaks quickly to Review and implement where feasible tankering to prevent waste Progress ‘Media Campaigns with Water Efficiency support lower resource and/ or from neighbouring Device Offering’ option zone. Continuation of Normal Activities plus Enhanced targeted Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ option Agreement required from Head of Water Quality to consider transfer of water from Cilfor system - Local Radio Supply / demand situation continually monitored into Rhiwgoch system. throughout the drought situation and the effectiveness - Target social media of demand-side measures. - Prepare and Publish DCWW Drought Web Page Continuation of preceding options. TUB consultation via Printed media Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last resort to demand-side measures to be included in media help conserve water supplies Implement environmental monitoring in line with campaign and as aligned with the communication plan.) Monitoring Plan. Ask you to respect this to ensure supplies to people in the area Introduction of TUBs (Saving of 0 – 5% demand, 0 – are conserved Review current operational activities to preserve 0.60 Ml/d). resource. Thank you in advance for your cooperation Continuation of preceding options. Continue to review and implement where feasible Implement TUBS Preplanning for the implementation of NEUBs. tankering to support lower resource and/ or from

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neighbouring zone. Continuation of Previous Techniques plus Enhanced messaging via: Prepare Drought Order/ Permit applications. - Local Radio Review requirement to support Cilfor system from - Targeted social Media Dolbenmaen system. - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. The existing Operating Agreement and licence Continuation of Previous Activities with the enhanced message Drought allows the Dead Storage in Llyn Cwmystradllyn to Increasing public awareness and content of new We appreciate your help so far in observing the temporary use be pumped into usage either at Cwmystradllyn demand-side measures to be included in media restrictions WTW or for release and subsequent re-abstraction campaign and as aligned with the communication plan.) at Dolbenmaen. Water levels are at very low levels so we ask you think carefully Introduction of NEUBs (Saving of 0 – 5% NHH demand, about the waster you use Should demand remain above 16 Ml/d with the 0 – 0.2 Ml/d). demand management measures in place, and Urge you not to waste any water Implementation of Emergency Drought Orders as Last should Llyn Cwmystradllyn and/ or Llyn Tecwyn Implementation of NEUB Resort (Saving likely 0-10%, 0 – 1.20 Ml/d) storages decline into the Severe Drought zone of the storage diagrams, Drought Permit solutions Non-essential use restrictions will be implemented. This is a last will be sought for supply side options 8034.D1, D2 resort but essential if going to conserve supplies for customers. and D3 - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 16 - Lleyn-Harlech Drought Action Sequence of Events

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Drought Management Options - Supply Side

8034.D1 - Reduce compensation flow releases from Llyn Cwmystradllyn Option Name Reduce compensation flow releases from Llyn Cwmystradllyn

Trigger(s) (or preceding actions) Drought- Prepare Drought Order/ Permit applications. Severe Drought- Should demand remain above 16 Ml/d with the demand management measures in place, and should Llyn Cwmystradllyn and/ or Llyn Tecwyn storages decline into the Severe Drought zone of the storage

diagrams, Drought Permit solutions will be sought for supply side Options 1 and 2. Yield of action 1 Ml/d Ml/day unless stated otherwise Location Lleyn Peninsula and Porthmadog Area affected or whole supply zone

Implementation timetable We assume a decision from NRW within 14 days of Preparation time, time of year effective, submitting the Drought Permit application. duration The practical implementation of the option could be effected within 1 week. The option is most likely to be implemented during the late

OptionImplementation Assessment summer and autumn period, although it could be implemented at any time during the year. The drought permit would be in place for up to 6 months Permissions required and constraints Drought Permit-NRW Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved.

Risk to the Environment (High/Medium/Low or unknown) Medium

Summary of likely environmental impacts An Environmental Assessment Report (EAR) has been

Include details for features of moderate prepared for this drought option, however it is understood and major sensitivity and minor sensitivity that NRW have outstanding issues with the assessment features from designated sites presented in the EAR. The zone of hydrological influence of drought permit implementation includes the Afon Henwy and Afon Dwyfor and minor hydrological impacts are anticipated. The EAR concluded no significant impacts of drought permit implementation on all ecological receptors with the exception of freshwater pearl mussel, where, in the EnvironmentalAssessment absence of survey data, impacts were assessed as significant. Subsequent surveys in 2012 concluded that the freshwater pearl mussel populations in both rivers are very small, and comprise a few adult individuals spread over

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considerable lengths of each river. It was concluded that these are remnants of formerly denser and presumably recruiting populations. Drought order implementation has the potential to result in significant impacts to this receptor of major sensitivity. No impacts on designated sites were identified in the EAR. Baseline information used The Environmental Assessment Report prepared in 2012 utilised available information from surveys and investigations undertaken by DCWW and NRW. In addition, a programme of environmental monitoring was undertaken in 2012, including surveys for freshwater pear mussel. Summary of additional baseline The Environmental Monitoring Plan (EMP) sets out the monitoring requirements monitoring that would be required if a drought permit is implemented, and is presented in the EAR. The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for: River flows, physico-chemical water quality, fish, macrophytes and macroinvertebrates. In addition to the EMP, it is recommended that hydrological cross-section surveys at locations where freshwater pearl mussels were recorded are undertaken during suitable flow events, to better determine the impacts of flow and level changes on the population. Mitigation measures Mitigation measures were identified in the EAR. These include: Isolated freshet release from the reservoir to alleviate any water quality pressures, release of water from lower down the reservoir if water temperatures in the river increase and fish rescue if barriers obstruct fish. Further monitoring of freshwater pearl mussel is recommended in order to determine impact and therefore, suitable mitigation measures. Impact on other activities The EAR identified no significant adverse impacts on other e.g. fisheries, industry etc activities including; landscape and visual amenity, recreation (including angling) and archaeology and cultural heritage.

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8034.D2 - Reduce regulation releases from Llyn Cwmstradllyn Option Name Stage 2 - Reduce regulation releases from Llyn Cwmystradllyn Trigger(s) (or preceding actions) Drought- Prepare Drought Order/ Permit applications. Severe Drought- Should demand remain above 16 Ml/d with the demand management measures in place, and should Llyn Cwmystradllyn and/ or Llyn Tecwyn storages decline into the Severe Drought zone of the storage

diagrams, Drought Permit solutions will be sought for supply side Options 1 and 2. Yield of action 1 Ml/d Ml/day unless stated otherwise

Location Lleyn Peninsula and Porthmadog Area affected or whole supply zone

Risk to the Environment (High/Medium/Low or unknown) Medium

Summary of likely environmental impacts An Environmental Assessment Report (EAR) has been Include details for features of moderate prepared for this drought option, however it is understood

and major sensitivity and minor sensitivity that NRW have outstanding issues with the assessment features from designated sites presented in the EAR. The zone of hydrological influence of drought permit implementation includes the Afon Henwy and Afon Dwyfor and minor hydrological impacts are anticipated. Stage 2 of the drought permit is noted as having a slightly higher magnitude of hydrological impacts than Stage 1, but impacts were still classified as minor. The EAR concluded no significant impacts of drought

EnvironmentalAssessment permit implementation on all ecological receptors with the exception of freshwater pearl mussel, where, in the absence of survey data, impacts were assessed as significant. Subsequent surveys in 2012 concluded that the freshwater pearl mussel populations in both rivers are very small, and comprise a few adult individuals spread over

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considerable lengths of each river. It was concluded that these are remnants of formerly denser and presumably recruiting populations. Drought order implementation has the potential to result in significant impacts to this receptor of major sensitivity.No impacts on designated sites were identified in the EAR. Baseline information used The Environmental Assessment Report prepared in 2012 utilised available information from surveys and investigations undertaken by DCWW and NRW. In addition, a programme of environmental monitoring was undertaken in 2012, including surveys for freshwater pear mussel. Summary of additional baseline The Environmental Monitoring Plan (EMP) sets out the monitoring requirements monitoring that would be required if a drought permit is implemented, and is presented in the EAR. The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for; River flows, physico-chemical water quality, fish, macrophytes and macroinvertebrates. In addition to the EMP, it is recommended that hydrological cross-section surveys at locations where freshwater pearl mussels were recorded are undertaken during suitable flow events, to better determine the impacts of flow and level changes on the population. Mitigation measures Mitigation measures were identified in the EAR. These include: Isolated freshet release from the reservoir to alleviate any water quality pressures, release of water from lower down the reservoir if water temperatures in the river increase and fish rescue if barriers obstruct fish. Further monitoring of freshwater pearl mussel is recommended in order to determine impact and therefore, suitable mitigation measures. Impact on other activities The EAR identified no significant adverse impacts on other e.g. fisheries, industry etc activities including; landscape and visual amenity, recreation (including angling) and archaeology and cultural heritage.

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8034.D3 - Extension of the siphon arrangement to exploit the Dead Storage in Llyn Tecwyn Option Name Extension of the syphon arrangement to exploit the Dead Storage in Llyn Tecwyn Trigger(s) Drought- Prepare Drought Order/ Permit applications. (or preceding actions) Severe Drought- Should demand remain above 16 Ml/d with the demand management measures in place, and should Llyn Cwmystradllyn and/ or Llyn Tecwyn storages decline into the Severe Drought zone of the storage diagrams, Drought Permit solutions will be sought for supply side Options 8034.D1 and D2. Yield of action 1.5 Ml/d Ml/day unless stated otherwise Location Cilfor – Harlech’ system of Llyn Eiddew Mawr and Llyn Tecwyn Area affected or whole supply Uchaf zone The Dead Storage amounts to some 400 Ml that is equivalent to essment around 60% of the Live Storage in Llyn Tecwyn. As there is no Compensation Water release requirement for this source the river channel downstream of the dam is routinely without flow during the summer months. Implementation timetable We assume a decision from NRW within 14 days of submitting the Preparation time, time of year Drought Permit application. effective, duration The practical implementation of the option could be effected within 4 weeks. Engineering work will need to take place in this time including Piped

OptionImplementation Ass extension to intake, pipes, pumps, generators. The option is most likely to be implemented during the late summer and autumn period, although it could be implemented at any time during the year. The drought permit would be in place for up to 6 months Permissions required and Drought Permit and Flood Defence Consent- NRW constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved Timescales – there is a risk this option could take longer than 4 weeks to implement due to unforseen engineering implications Risk to the Environment

(High/Medium/Low or unknown) Low

Summary of likely An Environmental Assessment Report (EAR) has been prepared for environmental impacts this drought option, however it is understood that NRW have Include details for features of outstanding issues with the assessment presented in the EAR. moderate and major sensitivity Hydrological impacts of drought permit implementation on Llyn and minor sensitivity features Tecwyn Uchaf were identified as major. Impacts on the downstream from designated sites watercourse, the Nant-yr-Efail, were scoped out of the assessment, since the upper reach of the watercourse is often dry for prolonged periods. EnvironmentalAssessment The EAR concluded no significant impacts of drought permit implementation on all ecological receptors with the exception of

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fish in Llyn Tecwyn Uchaf, where impacts could be significant. Although the lake is stocked with rainbow trout and brown trout, it is noted that the lake could provide habitat for eel, and potentially a wild population of brown trout. The drought permit does not have the potential to effect any European-designated sites or any SSSIs. Baseline information used The Environmental Assessment Report prepared in 2012 utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The Environmental Monitoring Plan (EMP) sets out the monitoring monitoring requirements that would be required if a drought permit is implemented, and is presented in the EAR. The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for; Physico-chemical water quality, fish and macrophytes. Mitigation measures Mitigation measures were identified in the EAR. These include: Establish a minimum water level in the dead storage zone, monitoring of dissolved oxygen, with artificial aeration to be deployed if dissolved oxygen falls below 5 mg/l, risk rescue fish to a suitable receptor site (in consultation with NRW) and re-stocking of fish species following sufficient recovery of water levels. Impact on other activities The EAR identified that the potential for significant effects on e.g. fisheries, industry etc angling in Llyn Tecwyn Uchaf. No significant adverse impacts were identified on other activities including; landscape and visual amenity, recreation and archaeology and cultural heritage.

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Llyn Cwmystradllyn and Tecwyn Uchaf Combined Storage Drought Action Zones 100

90 NORMALOPERATION 80

DEVELOPING DROUGHT 70

DROUGHT 60

40 ReservoirStorage (%) SEVERE DROUGHT

EMERGENCY STORAGE 10

Figure 11 - Combined Llyn Cwmstradllyn and Llyn Tecwyn Uchaf Drought Action Zones

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Dyffryn Conwy - 8035

Location Plan 9 - Dyffryn Conwy Water Resource Zone

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Dyffryn Conwy Water Resources No. Location Licence No. Type 1 Llyn Conwy 23/66/01/0004 Impounding Reservoir 2 Llyn Cowlyd 23/66/10/0007 Impounding Reservoir Table 17 - Dyffryn Conwy abstraction licences

The location of the WRZ is shown on the Welsh Water Area map and the locations of the resources are shown in . Drought Control Lines have been defined for Llyn Conwy and Llyn Cowlyd Reservoirs, as shown in Figures A20 and A21 and drought actions are given in Table A18. Current Resource Status The principal resource in this WRZ is Llyn Cowlyd. The storage in Llyn Cowlyd is managed between Welsh Water and RWE Npower, who operate a Hydro Electric Power scheme. Of the storage, 53% is for Welsh Water’s exclusive use and 47% is shared between Welsh Water and RWE Npower. Should Welsh Water need additional quantities of storage from the shared volume, negotiations would need to take place to purchase storage at the expense of the lost generation capability by RWE Npower. There are no compensation water discharge requirements for Llyn Cowlyd. Llyn Conwy is the secondary source in the WRZ, which along with its own supply area can feed part of the ‘normal’ Llyn Cowlyd supply area. A compensation discharge of 0.91 Ml/d is required from Llyn Conwy. During 2012/2013 the average demand in this WRZ was 28.53 Ml/d and the peak week demand was 30.98 Ml/d.

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Drought Actions - Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within Use the water that you need but please don’t waste levels. operational rules and within quality it constraints Ongoing leakage maintenance and water efficiency General Water Efficiency Campaigns via: work streams. - Radio Preplanning for the implementation of ‘Media - Education Centres Campaign with Water Efficiency Device Offering’ and ‘Enhanced Leakage Management’ option. - Water Efficiency Web Page Developing Raise and increase awareness of the importance of Commence increased liaison with operational Use what you need but please don’t waste water. Drought water conservation measures through the established colleagues and NRW in line with We increasingly need your help to conserve water media campaigns as per the communication plan Management and Communications Plan. supplies. which will include requests for voluntary restraint. Review and implement where feasible We are also doing our bit by ensuring we fix leaks Progress ‘Media Campaigns with Water Efficiency tankering to support lower resource and/ or quickly to prevent waste Device Offering’ option from neighbouring zone. Continuation of Normal Activities plus Enhanced Undertake ‘Enhanced Leakage Management’ option targeted Water Efficiency Messaging via: Supply / demand situation continually monitored - Local Radio throughout the drought situation and the effectiveness of demand-side measures. - Target social media Continuation of preceding options. - Prepare and Publish DCWW Drought Web Page Preplanning for the implementation of TUBs and TUB consultation via Printed media NEUBs. Drought Increasing public awareness and content of new Implement environmental monitoring in line We’ve introduced a temporary hosepipe ban as a demand-side measures to be included in media with Monitoring Plan. last resort to help conserve water supplies campaign and as aligned with the communication Review current operational activities to Ask you to respect this to ensure supplies to people plan.) preserve resource. in the area are conserved Introduction of TUBs (Saving of 0 – 5% demand, 0 - Continue to review and implement where Thank you in advance for your cooperation 1.43 Ml/d). feasible tankering to support lower resource Implement TUBS Continuation of preceding options. and/ or from neighbouring zone. Even in significant drought years experienced since Continuation of Previous Techniques plus Enhanced Preplanning for the implementation of NEUBs. 1970, Llyn Cowlyd has seldom been drawn messaging via: down below the 50% full figure. The likely drought scenario for Llyn Cowlyd would be - Local Radio

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concerns for refill in a dry winter following a - Targeted social Media dry summer. - Plus Call Centre Pre recorded Messages Prepare Drought Order/ Permit applications. - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new A Drought Permit solution would be sought Continuation of Previous Activities with the Drought demand-side measures to be included in media for supply side option 8035.D1. enhanced message campaign and as aligned with the communication We appreciate your help so far in observing the plan.) temporary use restrictions Introduction of NEUBs (Saving of 0 – 5% NHH demand, Water levels are at very low levels so we ask you 0.28 Ml/d). think carefully about the waster you use Continuation of preceding options. Urge you not to waste any water Implementation of Emergency Drought Orders as Last Implementation of NEUB Resort (Saving likely 0-10%, 0 – 2.85 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 18 - Dyffryn Conwy Drought Actions Sequence of Events

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Drought Management Options - Supply Side

8035.D1 - Increase the annual abstraction licence quantity from Llyn Cowlyd Option Name Increase the annual abstraction licence quantity from Llyn Cowlyd

Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe Drought- Solution would be sought Yield of action 2 Ml/d Ml/day unless stated otherwise

This option will allow full use of Welsh Water’s share of the Llyn Cowlyd storage without exceeding the annual abstraction licence. Location Llyn Conwy is the secondary source in the WRZ, which Area affected or whole supply zone along with its own supply area can feed part of the ‘normal’ Llyn Cowlyd supply area. A compensation discharge of 0.91 Ml/d is required from Llyn Conwy. Implementation timetable We assume a decision from WG within 28 days of Preparation time, time of year effective, submitting the Drought Order application. duration The practical implementation of the option could be effected within 1 week.

The drought order would be in place for up to 6 months. OptionImplementation Assessment Permissions required and constraints Drought Order- WG Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option This is believed to have a minimal impact during the drought event, though the potential impact is that reservoir refill will take longer after the drought event has ended, as storage would start from a lower base position. Risk to the Environment Unknown: This option has been determined during the (High/Medium/Low or unknown) draft drought plan process. The Generic Environmental Plan will be applied to this site, and a site specific

Environmental Monitoring Plan will be produced with a Drought Plan review. Summary of likely environmental impacts Llyn Cowlyd is located within Snowdonia SAC and SSSI, Include details for features of moderate and therefore, major sensitivity major sensitivity and minor sensitivity features from designated sites Baseline information used

Summary of additional baseline monitoring EnvironmentalAssessment requirements

Mitigation measures

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Impact on other activities e.g. fisheries, industry etc

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Llyn Cowlyd Reservoir Drought Action Zones 100

90 NORMALOPERATION

80 DEVELOPING DROUGHT

60 DROUGHT

40 ReservoirStorage (%) SEVERE DROUGHT

EMERGENCY STORAGE 10

Figure 12 - Llyn Cowlyd Drought Action Zones

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Llyn Conwy Reservoir Drought Action Zones

100 NORMALOPERATION 90 DEVELOPING DROUGHT

DROUGHT 70

40 SEVERE DROUGHT Reservoir StorageReservoir (%)

10 EMERGENCY STORAGE

Figure 13 - Llyn Conwy Drought Action Zones

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South Meirionnydd - 8036

Location Plan 10- South Meirionnydd Water Resource Zone

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South Meirionnydd Water Resources

No. Location Licence No. Type

1 Imported Supply to Corris N/A Bulk Supply from STW

2 Llyn Cynwch 23/64/04/0065 Impounding Reservoir

3 Afon Wnion 23/64/04/0068 River Abstraction – Pumped

4 Abergynolwyn 23/64/13/0030 Spring

5 Llanymawddwy 23/64/06/0018 Spring

6 Brynllys 23/64/06/0022 Spring

7 Afon Gwril 23/64/14/0003 River Abstraction - Gravity 8 Afon Calettwr 23/64/14/0002 River Abstraction - Gravity Table 19- South Meirionnydd abstraction licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A22. Drought Control Lines have been defined for Llyn Cynwch Reservoir as shown in Figure A23 and drought actions are given in Table A20. Current Resource Status The South Meirionnydd WRZ comprises a series of relatively minor sources that supply a network of small communities. There are small exports to Severn Trent Water. Llyn Cynwch is the principal resource for the WRZ with a storage capacity of 678 Ml, although it has a small catchment area relative to its storage volume and is slow to refill. In the aftermath of the 1995 dry summer, for example, Llyn Cynwch did not spill until April 1999. This concern for refill during winter periods caused Welsh Water to pursue a pump refill scheme from the Afon Wnion. In the event of a critical summer drought, there would be a real possibility of the small river or spring sources in Meirionnydd all being affected at the same time. Previous experience demonstrate that tankering to Dinas Mawddwy and Abergynolwyn from Penycefn WTW is achievable within the current resource and licence configuration. The sources that serve the Llwyngwril area (Afon Calettwr and Afon Gwril) are capable of operating within the daily abstraction licences under severe drought conditions; however, it is unlikely there would be any additional resource from these sources to increase the licensed quantities. Consequently, Llyn Cynwch and Penycefn WTW need to provide additional support to both the Corris and Llwyngwril areas within the licensed amounts. As Llyn Cynwch is a multi-season critical source with the Afon Wnion refill option in place there would be scope for tankering from Penycefn WTW for up to 3 months at 0.1 Ml/d. Management during the first summer of a drought will need to ensure the continued take of water from STW as per agreed values, and that the abstractions to Gwastadgoed WTW, which supplies the Llwyngwril area, maintain demand within the existing licences and that Llyn Cynwch and Penycefn WTW are capable of carrying the additional burden within the existing licensed quantities.

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Therefore, whilst Llyn Cynwch supports the WRZ, it is most likely that the determining aspects of resource management will be maintaining the operations within the abstraction licences. During 2012/2013 the average demand in this WRZ was 2.09 Ml/d and the peak week demand was 2.41 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, within Use the water that you need but please don’t waste demand levels. operational rules and within quality constraints it Ongoing leakage maintenance and water efficiency General Water Efficiency Campaigns via: work streams. - Radio Preplanning for the implementation of ‘Media - Education Centres Campaign with Water Efficiency Device Offering’ and ‘Enhanced Leakage Management’ option. - Water Efficiency Web Page Developing Raise and increase awareness of the importance of Commence increased liaison with operational Use what you need but please don’t waste water. Drought water conservation measures through the colleagues and NRW in line with Management We increasingly need your help to conserve water established media campaigns as per the and Communications Plan. supplies. communication plan which will include requests for Indicators likely to trigger the movement into the voluntary restraint. We are also doing our bit by ensuring we fix leaks developing drought zone are the rate of supply quickly to prevent waste Progress ‘Media Campaigns with Water Efficiency for the Corris area exceeding 85% of the Bulk Device Offering’ option Supply from STW and the abstractions to Continuation of Normal Activities plus Enhanced Gwastadgoed WTW and from Llyn Cynwch targeted Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ exceeding 85% of the daily licensed quantity for option more than 7 days - Local Radio Supply / demand situation continually monitored On exceeding 85% of the STW Bulk Supply we - Target social media throughout the drought situation and the would discuss opportunities to obtain quantities effectiveness of demand-side measures. - Prepare and Publish DCWW Drought Web Page in excess of the agreed amount. For the purpose Continuation of preceding options. of drought planning it will be presumed that TUB consultation via Printed media Welsh Water will not be able to obtain any Preplanning for the implementation of TUBs and additional quantity for the Corris area. NEUBs. Additional tankering to the Corris and Gwastadgoed areas should commence to sustain demands within the licensed limits. Drought Increasing public awareness and content of new In a normal dry summer tankering to the small We’ve introduced a temporary hosepipe ban as a demand-side measures to be included in media source areas of Abergynolwyn and Dinas last resort to help conserve water supplies campaign and as aligned with the communication Mawddwy from Penycefn WTW will have already Ask you to respect this to ensure supplies to people plan.) commenced. in the area are conserved Introduction of TUBs (Saving of 0 – 5% demand, 0 – Implement environmental monitoring in line with Thank you in advance for your cooperation 0.10 Ml/d). Monitoring Plan.

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Continuation of preceding options. Review current operational activities to preserve Implement TUBS resource. Preplanning for the implementation of NEUBs. Continuation of Previous Techniques plus Enhanced Review and implement where feasible tankering messaging via: from neighbouring zone. - Local Radio Prepare Drought Order/ Permit applications. - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. Should the demand management alternatives Continuation of Previous Activities with the Drought not reduce demand, then the next step would be enhanced message Increasing public awareness and content of new to pursue a Drought Permit solution to supply demand-side measures to be included in media We appreciate your help so far in observing the side option 8036.D1 campaign and as aligned with the communication temporary use restrictions plan.) Water levels are at very low levels so we ask you Introduction of NEUBs (Saving of 0 – 5% demand, 0 think carefully about the waster you use – 0.02Ml/d). Urge you not to waste any water Implementation of Emergency Drought Orders as Implementation of NEUB Last Resort (Saving likely 0-10%, 0 – 0.21 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 20 - South Meirionnydd Drought Actions Sequence of Events

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Drought Management Options - Supply Side

8036.D1 - Increase abstraction from Llyn Cynwch to Penycefn WTW to support tankering to outlying source areas Option Name Increased abstraction from Llyn Cynwch to Penycefn WTW to support tankering to outlying source areas Trigger(s) Drought- Prepare Drought Order/Permit (or preceding actions) applications Severe drought- Should the demand management alternatives not reduce demand, then the next step would be to pursue a

Drought Permit solution to supply side option 8036.1. Yield of action 0.1 Ml/d Ml/day unless stated otherwise

Location Whole Supply Zone Area affected or whole supply zone Implementation timetable We assume a decision from NRW within 14 Preparation time, time of year effective, duration days of submitting the Drought Permit application. The practical implementation of the option could be effected within 1 week.

OptionImplementation Assessment This drought option could be implemented at any time during the year. The drought permit would be in place for up to 6 months Permissions required and constraints Drought Permit- NRW Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option The application, as applied for, is not approved Impact will be greater reservoir drawdown.

Risk to the Environment (High/Medium/Low or unknown) Low

Summary of likely environmental impacts An Environmental Monitoring Plan (EMP) was

Include details for features of moderate and major prepared for a drought permit at this site in sensitivity and minor sensitivity features from 2009, however, the option presented in the designated sites EMP was to increase the abstraction from Llyn Cynwch by 1Ml/d (i.e. ten times that proposed in the option presented here). The EMP does not constitute an Environmental Assessment Report (EAR) which would describe the potential impacts of drought permit implementation on sensitive features. EnvironmentalAssessment However, the EMP does present a hydrological assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies.

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In the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The drought permit will increase the rate of drawdown of Llyn Cynwch, however, the drought permit would not extend abstraction into the dead storage and DCWW are permitted to fully utilise the live storage available. The hydrological impacts are associated with the delay to spill of the reservoir to the downstream watercourses. The zone of hydrological influence of drought permit implementation includes one reach, the Afon Wnion (2.24km, negligible hydrological impact of the 1Ml/d daily increase in abstraction). Resulting impacts of the changes to the flow regime from the 0.1Ml/d increase in abstraction drought options on ecological features (in Llyn Cynwch) including macroinvertebrates, macrophytes and fish (including Atlantic salmon, brown trout, eel and brook lamprey) species are not anticipated to be significant. There are no statutory designated sites within the zone of influence of the scheme. Baseline information used An EMP was prepared for a drought option at this site in 2009 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline monitoring The EMP was agreed by DCWW and NRW (then requirements Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: Llyn Cynwch: Reservoir level, Biochemical water quality, fish (including lamprey) and macrophytes including Luronium natans). Cynwch outflow channel: Biochemical water quality, fish (including lamprey), macroinvertebrates and macrophyte (including Luronium natans) species. However, since hydrological impacts have been assessed as negligible, following an environmental assessment it is anticipated that no significant impacts on sensitive features will be identified and mitigation measures may not be required.

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Mitigation measures The EMP identified a number of mitigation measures during implementation of the drought permit. However, since hydrological impacts have been assessed as negligible, following an environmental assessment it is anticipated that no significant impacts on sensitive features will be identified and mitigation measures may not be required. However, following the precautionary principle, the following mitigation measures were proposed in the EMP. Cynwch outflow channel: Physical modification to existing structures that could present as barriers to fish migration, capture and relocation of fish upstream of migratory barriers, flow deflectors may be used to ensure gravel remains silt free, if identified as required and, if required, fish rescue in consultation with NRW and/or restocking using off spring of broodstock from the catchment. Llyn Cynwch: Aeration of the reservoir if temperatures and oxygen levels become prohibitive for survival of the species and if required, and, if required, fish rescue in consultation with NRW and/or restocking of coarse fish. Impact on other activities No significant impacts on landscape and visual e.g. fisheries, industry etc amenity, recreation (including angling) and archaeology and cultural heritage are anticipated.

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Llyn Cynwch Reservoir Drought Action Zones 100

90 NORMALOPERATION

80 DEVELOPING DROUGHT 70

DROUGHT 60

40 ReservoirStorage (%) SEVERE DROUGHT

20 EMERGENCY STORAGE 10

22/01 05/02 26/02 12/03 26/03 16/04 30/04 21/05 04/06 18/06 09/07 23/07 27/08 10/09 01/10 15/10 29/10 19/11 03/12 24/12 01/01 08/01 15/01 29/01 12/02 19/02 05/03 19/03 02/04 09/04 23/04 07/05 14/05 28/05 11/06 25/06 02/07 16/07 30/07 06/08 13/08 20/08 03/09 17/09 24/09 08/10 22/10 05/11 12/11 26/11 10/12 17/12 31/12

Figure 14 - Llyn Cynwch Drought Action Zones

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Ross on Wye - 8101

Location Plan 11- Ross-on-Wye Water Resource Zone

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Ross-on-Wye Water Resources No. Location Licence No. Type 1 Alton Court Borehole 19/55/18/0208 Borehole Regulated river and abstraction Severn Trent Import from Mitcheldean constrained by licence 2 N/A WTW conditions related to regulation conditions. Table 21- Ross-on-Wye abstraction licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A24. Drought actions for this WRZ are given in Table A22. Current Resource Status The WRZ is supplied in its entirety by the Bulk Supply of potable water from Severn Trent Water’s Mitcheldean WTW. The existing Alton Court Borehole has been withdrawn from routine supply and is preserved as a standby source in the event of an emergency. The raw water source for Mitcheldean WTW is an abstraction from the River Wye at Lydbrook. Whilst the licence is held by Severn Trent Water, the licence conditions specify that 9 Ml/d supplies the Ross-on-Wye WRZ. Should the Ross-on-Wye demand be less than 9 Ml/d the licence conditions preclude Severn Trent Water from using the balance within their own Lower Severn resource WRZ. As such Welsh Water has high confidence that the full 9 Ml/d will always be available in the event of high demand. With Elan Reservoir storage below the lower rule curve (see the Elan/ Builth WRZ section), the rules for the Wye regulation change such that the regulation amount is reduced and the supported abstractions at Lydbrook and Monmouth are constrained. The existing abstraction licences for both Monmouth and Lydbrook do not allow the temporary reallocation of any ‘spare’ Monmouth abstraction quantity under these circumstances. To support the Ross-on-Wye WRZ, a Drought Order would be required to restore the ability to reallocate the spare regulation release water between the two sites. For 2013/13 the average demand was 5.90 Ml/d and the peak week demand was 6.82 Ml/d.

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Ross on Wye Drought Action Zones 12.00

10.00

8.00

6.00 Mld

4.00

Normal operation 2.00

0.00

Developing drought zone Drought to severe drought zone Previous supply max

Figure 15- Ross on Wye Drought Action Zones

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within operational Use the water that you need but please don’t waste it levels. rules and within quality constraints General Water Efficiency Campaigns via: Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ and - Water Efficiency Web Page ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison with operational colleagues Use what you need but please don’t waste water. Drought water conservation measures through the and NRW in line with Management and Communications We increasingly need your help to conserve water supplies. established media campaigns as per the Plan. communication plan which will include requests for We are also doing our bit by ensuring we fix leaks quickly to Welsh Water will continue to monitor the rate of import voluntary restraint. prevent waste from Mitcheldean WTW. Progress ‘Media Campaigns with Water Efficiency Continuation of Normal Activities plus Enhanced targeted Water Review and implement where feasible tankering to Device Offering’ option Efficiency Messaging via: support lower resource areas. Undertake ‘Enhanced Leakage Management’ option - Local Radio Supply / demand situation continually monitored - Target social media throughout the drought situation and the effectiveness of demand-side measures. - Prepare and Publish DCWW Drought Web Page Continuation of preceding options. TUB consultation via Printed media Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new When the demand rises above 8.5 Ml/d (close to the We’ve introduced a temporary hosepipe ban as a last resort to demand-side measures to be included in media current agreement quantity of 9 Ml/d) we will look to help conserve water supplies campaign and as aligned with the communication implement the following actions: Ask you to respect this to ensure supplies to people in the area plan.) Implement environmental monitoring in line with are conserved Introduction of TUBs (Saving of 0 – 5% demand, 0 – Monitoring Plan. Thank you in advance for your cooperation 0.29 Ml/d). Re-instate Alton Court borehole. Implement TUBS

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Continuation of preceding options. Review current operational activity in zone. Continuation of Previous Techniques plus Enhanced messaging via: Preplanning for the implementation of NEUBs. If demand continues to remain above 8.5 Ml/d, commence tankering from Broomy Hill WTW (Hereford - Local Radio CU WRZ) to avoid exceedence of the Bulk Supply - Targeted social Media agreement with Severn Trent Water. - Plus Call Centre Pre recorded Messages Prepare Drought Order applications. - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. A Drought Order solution would be sought for supply side Continuation of Previous Activities with the enhanced message Drought option 8101.D1. Welsh Water Executive would be Increasing public awareness and content of new We appreciate your help so far in observing the temporary use approached to sanction supply side option 8102.D2. demand-side measures to be included in media restrictions campaign and as aligned with the communication Water levels are at very low levels so we ask you think carefully plan.) about the waster you use Introduction of NEUBs (Saving of 0 – 5% NHH Urge you not to waste any water demand, 0 - 0.07 Ml/d). Implementation of NEUB Implementation of Emergency Drought Orders as Last Resort (Saving likely 0-10%, 0 – 0.59 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 22 - Drought Actions for Ross-on-Wye WRZ

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Drought Management Options – Supply Side

8101.D1 - Exchange of spare Wye Regulation water to Severn Trent’s Lydbrook abstraction point Exchange of spare Wye Regulation water to Severn Trent Water’s Lydbrook abstraction point Option Name

Drought- Prepare Drought Order/ Permit applications.

Trigger(s) Severe Drought- should weekly demand remain above 8.5 (or preceding actions) Ml/d of licensed amount, Welsh Water would seek a Drought

Order solution

Yield of action Ml/day unless stated 3 Ml/d otherwise Location Area affected or whole Whole zone supply zone Total 6 weeks: 1 week application preparation time Implementation timetable We assume a decision from WG within 28 days of submitting Preparation time, time of the Drought Order application. year effective, duration 1 week for practical implementation of option Additional pumping/ treatment capacity is already available Option Implementation Assessment Implementation Option on site. Permissions required and constraints Including details of liaison Drought order - WG carried out with bodies responsible for giving any permits or approvals Risks associated with

option

Risk to the Environment Low: the abstraction is within scope of existing Wye (High/Medium/Low or Regulation such that it is not anticipated that there would be unknown) any additional environmental impacts. Summary of likely environmental impacts Include details for features Potential for impacts on River Wye SAC and SSSI, but action is of moderate and major within scope of existing Regulation. sensitivity and minor sensitivity features from

designated sites Environmental Assessment Environmental

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Baseline information used

Summary of additional baseline monitoring None identified requirements

Mitigation measures None identified

Impact on other activities None identified e.g. fisheries, industry etc

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8101.D2 - Reinstate Alton Court

Option Name Re-instate Alton Court Consistently elevated demand. Full utilisation of other Trigger(s) drought options on both demand and supply side. (or preceding actions) If agreed appropriate response by Welsh Water Executive

Yield of action Estimated 1.1 Ml/d available

Ml/day unless stated otherwise

Location Whole zone Area affected or whole supply zone More than 18 months: DWI and borehole monitoring to be undertaken ahead of time. Implementation timetable The practical implementation of the option is likely to Preparation time, time of year effective, duration take in excess of 18 months due to the water quality and potential treatment requirements.

Option Implementation Assessment Assessment Implementation Option

Permissions required and constraints Land access for pipeline route to be agreed with Including details of liaison carried out with bodies responsible for giving any landowners permits or approvals Unable to treat the raw water to required standards Availability of required assets to enable the treatment Risks associated with option and distribution of the water

Risk to the Environment Low

(High/Medium/Low or unknown)

Summary of likely environmental impacts

Include details for features of Short term disturbance along pipeline route moderate and major sensitivity and minor sensitivity features from designated sites N/A

Baseline information used Environmental Assessment Assessment Environmental

Summary of additional baseline N/A monitoring requirements

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Mitigation measures

Impact on other activities N/A e.g. fisheries, industry etc

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Elan Builth - 8102

Location Plan 12- Elan / Builth Water Resource Zone

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Elan/ Builth Water Resources No. Location Licence No. Type

1 Elan Valley Reservoirs 19/55/01/0007 Impounding Reservoir

Regulated river (but 2 River Wye at Builth Wells 19/55/03/0038 abstraction not a component of regulation) Table 23 - Elan/ Builth abstraction licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A25. Drought actions for this WRZ are given in Table A24. Current Resource Status The WRZ is supported by two sources with the greater reliance placed on the supply from the Elan Reservoirs rather than the river abstraction at Builth Wells. Our abstraction from the Elan Reservoirs for direct treatment and supply in the Elan/ Builth WRZ is for a maximum of 5 Ml/d compared to the maximum quantity of raw water supplied to Severn Trent Water of 380 Ml/d. In addition the Elan Reservoirs are the subject of a Section 20 Operating Agreement between Welsh Water and EA to provide the release quantities for the River Wye regulation scheme. This supports abstractions from the lower part of the River Wye by Severn Trent Water at Lydbrook (Ross-on- Wye WRZ) and by Welsh Water at Monmouth (SEWCUS WRZ). The provision of the raw water bulk supply from the Elan Reservoirs to Severn Trent Water is the subject of a detailed Supply Agreement between Welsh Water and Severn Trent Water. In the context of the overall storage capacity of the Elan Reservoirs (99,499 Ml), Welsh Water’s use of 5 Ml/d is extremely marginal and it is highly unlikely that storage conditions in the Elan Reservoirs would become so depleted to jeopardise the availability of our direct supply quantity. For 2012/13 the average demand was 4.6 Ml/d with a peak week demand of 5.8 Ml/d. The peak week supplies generally coincide with the Royal Welsh Show which is held at Llanelwedd, Builth Wells. The Show attracts over 200,000 visitors across the four days it runs for with 2012 having 241,0991 thus placing a significant additional demand on our supply systems at this time.

1 http://www.rwas.co.uk/overseas-visitors/

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Elan Reservoirs Operation The Elan Reservoirs deliver up to 380 Ml/d into the Birmingham area of Severn Trent’s supply system and support abstractions of up to 136 Ml/d into Welsh Water’s South East Wales Conjunctive Use System (SEWCUS) and up to 27 Ml/d of Severn Trent’s abstraction at Lydbrook. Experience in 1975/ 76 and in 1984 has demonstrated that this source can be significantly depleted during a single season (dry summer) drought. A subsequent dry winter would then pose a significant risk for this resource. The Section 20 Operating Agreement and the Elan Valley Supply Agreement both contain provisions which require Welsh Water, EA and Severn Trent Water to meet and discuss ongoing drought management once the storage has fallen below the ‘Lower Rule Curve’ identified in the abstraction licence and shown on the accompanying Drought Diagram (Figure A26). The existing reservoir management is tightly controlled both by abstraction licence conditions, Section 20 operating agreements between Welsh Water and EA and operating terms derived from the bulk supply agreement between Welsh Water and Severn Trent Water. As such, future storage trigger points can be discussed by all parties so that the interests of both South Wales and the Midlands and the Wye and Severn catchments are identified. In the event that severe depletion of the resource occurs, experience in the 1976 and 1984 droughts demonstrated that refill could be assisted by reduction of the compensation and regulation releases. However impacts on the Elan river downstream of Caban Coch dam and the impact on the Upper Wye downstream of the Elan confluence would need to be understood. The River Wye and the River Elan are both designated as a Special Area of Conservation (SAC) under the Habitats Regulations. Any changes to our authorised operation will have to reflect the sensitivities of this designation. The River Wye SAC has been subject to the Review of Consents process undertaken by the then Environment Agency Wales (now Natural Resources Wales (NRW)) to meet their obligations under the EU Habitats Directive. The assessment considers the river flow requirements needed to support the designated species and the potential impact from our operations. Whilst the volumes of abstraction for both of these sources have been affirmed, the volume of release from the Elan reservoirs is still being reviewed. Once any amendments have been agreed, we will assess the impact on our operations during a drought and consider modifying the Drought Plan accordingly.

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Elan Builth Drought Action Zones

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3.00 Normal operation 2.00

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Developing Drought zone Drought to severe drought zone

Figure 16 - Elan Builth Drought Action Zones

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Drought Actions – Sequence of events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, within operational Use the water that you need but please don’t waste demand levels. rules and within quality constraints it Ongoing leakage maintenance and water General Water Efficiency Campaigns via: efficiency work streams. - Radio Preplanning for the implementation of ‘Media - Education Centres Campaign with Water Efficiency Device Offering’ and ‘Enhanced Leakage - Water Efficiency Web Page Management’ option. Developing Raise and increase awareness of the Commence increased liaison with operations Use what you need but please don’t waste water. Drought importance of water conservation measures colleagues and NRW in line with Management and We increasingly need your help to conserve water through the established media campaigns as Communications Plan. supplies. per the communication plan which will include Welsh Water will continue to monitor the abstraction requests for voluntary restraint. We are also doing our bit by ensuring we fix leaks at Builth Wells. Should the rate of abstraction exceed quickly to prevent waste Progress ‘Media Campaigns with Water 85% of the licensed quantity this may also be used as Efficiency Device Offering’ option an indicator of Developing Drought conditions and Continuation of Normal Activities plus Enhanced could form the basis for calling the Drought Liaison targeted Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ meeting. option - Local Radio Review and implement w here feasible tankering to Supply / demand situation continually support lower resource areas. - Target social media monitored throughout the drought situation and the effectiveness of demand-side - Prepare and Publish DCWW Drought Web Page measures. TUB consultation via Printed media Continuation of preceding options. Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a new demand-side measures to be included in last resort to help conserve water supplies Implement environmental monitoring in line with media campaign and as aligned with the Monitoring Plan. Ask you to respect this to ensure supplies to people communication plan.) in the area are conserved Review current operational activities to preserve Introduction of TUBs (Saving of 0 – 5% resource. Thank you in advance for your cooperation demand, 0 – 0.23 Ml/d). Continue to review and implement where feasible Implement TUBS Continuation of preceding options.

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tankering to support lower resource and/ or from Preplanning for the implementation of NEUBs. Continuation of Previous Techniques plus Enhanced neighbouring zone. messaging via: Prepare Drought Order applications. - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. Having implemented the above measures and should Continuation of Previous Activities with the Drought demand still remain above 7 Ml/d Welsh Water would enhanced message Increasing public awareness and content of consider supply side options 8102.D1 new demand-side measures to be included in We appreciate your help so far in observing the media campaign and as aligned with the temporary use restrictions communication plan.) Water levels are at very low levels so we ask you Introduction of NEUBs (Saving of 0 – 5% think carefully about the waster you use demand, 00.06 Ml/d). Urge you not to waste any water Implementation of Emergency Drought Orders Implementation of NEUB as Last Resort (Saving likely 0-10%, 0 – 0.46 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 24 - Elan Built Drought Action Sequence of Events

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Drought Management Options - Supply Side

8102.D1 - Increase the authorized abstraction at Builth Wells by 1.0 Ml/d and provide additional temporary treatment capacity Increase the authorized abstraction at Builth Wells Option Name by 1.0 Ml/d and provide additional temporary treatment capacity. Drought- Prepare Drought Order applications Trigger(s) Severe Drought- Demand side measures in place and (or preceding actions) zonal demand remaining above 7 Ml/d Yield of action 1 Ml/d Ml/day unless stated otherwise Location Additional resource for treatment at Builth Wells

Area affected or whole supply zone WTW Total 9 weeks: 1 week application preparation We assume a decision from WG within 28 days of submitting of Drought Order application. Implementation timetable The practical implementation of the option could be Preparation time, time of year effected within 4 weeks; dependent on availability of effective, duration required temporary treatment plant and manpower to deploy and operate. The option is most likely to be implemented during the summer and autumn period. Drought orders are valid for up to 6 months.

Option Implementation Assessment Implementation Option Permissions required and constraints Including details of liaison carried out Drought Order – Welsh Government with bodies responsible for giving any permits or approvals Potential difficulty associated with availability of required temporary treatment plant and manpower to deploy and operate. Risks associated with option Timescales – there is a risk this option could take longer than 9 weeks to implement due to unforseen engineering implications

Non granting of Drought Order by WG.

Risk to the Environment Low (High/Medium/Low or unknown) An Environmental Monitoring Plan (EMP) was Summary of likely environmental prepared for this drought order in 2007. The EMP impacts does not constitute an Environmental Assessment Include details for features of Report (EAR) which would describe the potential moderate and major sensitivity and impacts of drought order implementation on minor sensitivity features from sensitive features. However, the EMP does present a designated sites

Environmental Assessment Environmental hydrological assessment which lists the likely impacts

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of drought order implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. Low flows in the River Wye are supported by compensation and regulation releases and the hydrological influence of drought order implementation was assessed in the EMP as negligible. No significant effects are anticipated on ecological receptors including macroinvertebrates, macrophytes and fish. The River Wye is designated as both an SAC and SSSI. The negligible hydrological changes to the flow and level regime as a result of drought order implementation are not anticipated to result in significant impacts on designated features of the River Wye SAC and SSSI. An EMP was prepared for this drought option in 2007 Baseline information used and utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be Summary of additional baseline undertaken during and after implementation of a monitoring requirements drought order for: river flows, river cross section and wetted area, physico-chemical water quality, phytoplankton, salmonids, bullhead, lamprey, macroinvertebrates, white clawed crayfish, freshwater pearl mussel and macrophytes. Mitigation measures were identified in the EMP. These include: Installation of flow deflectors, measures to reduce fish entrainment, habitat enhancement, physical modification to existing structures that could present Mitigation measures as barriers to fish migration, relocation of fish upstream of migratory barriers, and if identified as required, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment, removal of freshwater pearl mussels to hatchery (if present).

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Elan Valley Operating Rule Curves Top Water Level 100000

Upper Rule Curve Maximum abstraction 409 Ml/d 90000 Maximum Hydro Generation Release 118

80000

70000 Maximum abstraction 386 Ml/d Lower Rule Curve Maximum Regulation Release to River Wye 164 60000

50000

Storage (Ml) Storage Maximum abstraction 327 Ml/d 40000 Maximum Regulation Release to River Wye 136 Ml/d 30000

20000

10000 Minimum Compensation Release is 64 Ml/d at all times

Jul Jul Jul

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Aug Aug Aug Sep Sep

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- - -

07 18 29

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05 16 27 08 19 30

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02 13 24 Date

Figure 17 - Elan Reservoirs Operating Rule Curves

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Hereford CU Area – 8103

Location Plan 13 - Hereford Conjunctive Use Water Resource Zone

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Hereford Conjunctive Use Water Resources No. Location Licence No. Type Regulated river (but abstraction 1 River Wye at Broomy Hill 19/55/15/0246 not a component of regulation) 2 Dunfield 19/55/09/0330 Borehole 3 Leintwardine 18/54/09/0367 Borehole 4 Byton (River Lugg) 19/55/08/0125 River abstraction 5 Midsummer Meadow 19/55/12/0431 Well Table 25 - Hereford Conjunctive Use abstraction licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A27. Drought actions for this WRZ are given in Table A26. Current Resource Status The supply for this WRZ is dominated by the Broomy Hill abstraction from the River Wye at Hereford at a licensed daily maximum of 52 Ml/d. The Dunfield boreholes, licensed to an average of 3.3 Ml/d, and Leintwardine borehole (1 Ml/d) serve small local areas of the WRZ. The abstractions from the River Lugg at Byton and Midsummer Meadow are currently not used; however, they are retained for potential emergency use. The River Wye is scheduled as a Special Area of Conservation (SAC) under the Habitats Regulations throughout most of its length. Any change to the terms of our authorised operation will have to reflect the sensitivities of this designation. The River Wye SAC has been subject to the Review of Consents process undertaken by the then Environment Agency Wales (now Natural Resources Wales (NRW)) to meet their obligations under the EU Habitats Directive. The assessment concluded the need to modify our Dunfield, Byton and Midsummer Meadow abstraction licences to include an additional low flow condition that restricts total abstraction out of the River Lugg catchment. The River Wye is regulated under low flow conditions by the release of water from the Elan Valley reservoirs to support abstractions in the Lower Wye at Lydbrook (for Severn Trent Water) and at Monmouth (for Welsh Water). The regulation releases enhance the low flows of the Wye between Caban Coch dam and the Monmouth intakes including the flows at Hereford. However, the abstraction at Broomy Hill is not dependent upon the regulation releases. At present the Broomy Hill licence remains unrestrained except for the licensed daily and annual quantities. Experience of operation in dry summers since 1976 have demonstrated that since the current Wye regulation scheme has been in operation, river levels even under extreme low flows have been sufficient to allow the existing Broomy Hill intake pumps to operate at their maximum authorised capacity. The Dunfield boreholes are already utilised to their licensed maximum amounts during drought periods. Experience of the Leintwardine source has demonstrated that it can sustain an abstraction greater than the licensed 1 Ml/d under dry weather conditions.

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Broomy Hill WTW has recently had enhanced treatment processes installed which has increased the treatment capacity of the works, which means that the WRZ constraint is the abstraction licence ceiling of 52 Ml/d. The Leintwardine boreholes are located in the Teme catchment that is a tributary of the River Severn, which is also scheduled as a SAC. Any change to the terms of our authorised operation will have to reflect the sensitivities of this designation. For 2012/13 the average demand was 32.5 Ml/d and the peak week demand was 37.6 Ml/d.

Hereford CUS Drought Action Zones

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50.00

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Normal operation

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Figure 18 - Hereford CUS Drought Action Zones

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, within Use the water that you need but please don’t waste it demand levels. operational rules and within quality constraints General Water Efficiency Campaigns via: Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ - Water Efficiency Web Page and ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison with operational Use what you need but please don’t waste water. Drought water conservation measures through the colleagues and NRW in line with Management We increasingly need your help to conserve water supplies. established media campaigns as per the and Communications Plan. communication plan which will include requests We are also doing our bit by ensuring we fix leaks quickly to Should the rate of abstraction at Broomy Hill for voluntary restraint. prevent waste exceed 85% of the licensed quantity then this Progress ‘Media Campaigns with Water Efficiency may also be used as an indicator of Developing Continuation of Normal Activities plus Enhanced targeted Water Device Offering’ option Drought conditions and could form the basis for Efficiency Messaging via: calling the Drought Liaison meeting. Undertake ‘Enhanced Leakage Management’ - Local Radio option Operationally when weekly demand at Leintwardine exceeds 0.9 Ml/d, it is necessary to - Target social media Supply / demand situation continually monitored introduce additional water into the area from throughout the drought situation and the - Prepare and Publish DCWW Drought Web Page Broomy Hill. effectiveness of demand-side measures. TUB consultation via Printed media Continuation of preceding options. Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last resort to demand-side measures to be included in media help conserve water supplies Implement environmental monitoring in line campaign and as aligned with the communication with Monitoring Plan. Ask you to respect this to ensure supplies to people in the area plan.) are conserved Review current operational activities to preserve Introduction of TUBs (Saving of 0 – 5% demand, 0 resource. Thank you in advance for your cooperation – 1.62 Ml/d).

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Continuation of preceding options. Review and implement where feasible tankering Implement TUBS to support lower resource and/or from Preplanning for the implementation of NEUBs. Continuation of Previous Techniques plus Enhanced messaging via: neighbouring zone. - Local Radio Prepare Drought Order/ Permit applications. - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. If all of the demand restrictions are in operation Continuation of Previous Activities with the enhanced message Drought and demand is still above 53 Ml/d there is a risk Increasing public awareness and content of new We appreciate your help so far in observing the temporary use of exceeding the abstraction licence at Broomy demand-side measures to be included in media restrictions Hill, Dunfield or at Leintwardine to meet campaign and as aligned with the communication demand. If this threshold is exceeded Drought Water levels are at very low levels so we ask you think carefully plan.) Order solutions will be sought for supply side about the waster you use Introduction of NEUBs (Saving of 0 – 5% demand, 0 options 8103.D1 and D2. Urge you not to waste any water – 0.59 Ml/d). Implementation of NEUB Implementation of Emergency Drought Orders as Last Resort (Saving likely 0-10%, 0 – 0.32 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service - Engagement with Chamber of Commerce and Trade Bodies - Preparation for Emergency Drought Orders - Media Campaign - Media Interviews with Senior Managers produced via TV and Radio Figure 19 - Hereford CUS Drought Actions Sequence of Events

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Drought Management Options - Supply Side

8103.D1 - Increase the abstraction at Broomy Hill by 3 Ml/d

Option Name Increase the abstraction at Broomy Hill by 3 Ml/d

Drought- Prepare Drought Order applications Trigger(s) Severe Drought- If demand restrictions are in operation and (or preceding actions) demand is still above 53 Ml/d. Yield of action Ml/day unless stated 3 Ml/d otherwise Location Area affected or whole Additional resource for treatment at Broomy Hill WTW. supply zone Total 6 weeks: 1 week application preparation time We assume a decision from Defra within 28 days of submitting Implementation timetable the Drought Order application. Preparation time, time of The practical implementation of the option could be effected year effective, duration within 1 week. The option is most likely to be implemented during the summer and autumn period. Drought orders are valid for up to 6 months. Option Implementation Assessment Implementation Option Permissions required and constraints Including details of liaison Drought Order - Defra carried out with bodies responsible for giving any permits or approvals Non granting of Drought Order by Defra. Risks associated with Issues at the treatment works that prevent full utilisation of option the additional resource. Risk to the Environment Low

(High/Medium/Low or unknown) An Environmental Monitoring Plan (EMP) was prepared for this drought order in 2007. The EMP does not constitute an Summary of likely Environmental Assessment Report (EAR) which would environmental impacts describe the potential impacts of drought order Include details for features implementation on sensitive features. However, the EMP does of moderate and major present a hydrological assessment which lists the likely sensitivity and minor impacts of drought order implementation on the flow/level sensitivity features from regime in the impacted waterbodies. In the absence of an Environmental Assessment Environmental designated sites EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes

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on sensitive ecological receptors. Low flows in the River Wye are supported by compensation and regulation releases and the hydrological influence of drought order implementation was assessed in the EMP as negligible. No significant effects are anticipated on ecological receptors including macroinvertebrates, macrophytes and fish. The River Wye is designated as both an SAC and SSSI. The negligible hydrological changes to the flow and level regime as a result of drought order implementation are not anticipated to result in significant impacts on designated features of the River Wye SAC and SSSI. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that Summary of additional should be undertaken during and after implementation of a baseline monitoring drought order for: river flows, river cross section and wetted requirements area, physico-chemical water quality, phytoplankton, salmonids, shad, bullhead, lamprey, grayling, macroinvertebrates, freshwater pearl mussel (if present), and macrophytes. Mitigation measures were identified in the EMP. These include: Installation of flow deflectors, measures to reduce fish entrainment, habitat enhancement, physical modification to existing structures that could present as barriers to fish Mitigation measures migration, relocation of fish upstream of migratory barriers, and if identified as required, fish rescue in consultation with EA and/or restocking using offspring of broodstock from the catchment, removal of freshwater pearl mussels to hatchery (if present). No significant impacts on landscape and visual amenity, Impact on other activities recreation (including angling) and archaeology and cultural e.g. fisheries, industry etc heritage are anticipated.

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8103.D2 - Increase the abstraction at Leintwardine by 0.1 Ml/d Increase the abstraction at Leintwardine by 0.1 Ml/d. Option Name

Drought- Prepare Drought Order applications Severe Drought- If demand restrictions are in operation and Trigger(s) demand is still above 53 Ml/d there is a risk of exceeding the (or preceding actions) abstraction licence at Broomy Hill, Dunfield or at Leintwardine to meet demand. If this threshold is exceeded Drought Order solutions will be sought for supply side options. Yield of action

Ml/day unless stated 0.1 Ml/d otherwise Location Area affected or whole Additional resource for treatment at Leintwardine WTW. supply zone Total 6 weeks: 1 week application preparation We assume a decision from Defra within 28 days of submitting Implementation timetable the Drought Order application. Preparation time, time of The practical implementation of the option could be effected year effective, duration within 1 week. The option is most likely to be implemented during the summer

Option Implementation Assessment Assessment Implementation Option period. Drought orders are valid for up to 6 months. Permissions required and constraints Including details of liaison Drought Order - Defra carried out with bodies responsible for giving any permits or approvals Non granting of Drought Order by Defra. Risks associated with option Issues at the treatment works that prevent full utilisation of the additional resource. Risk to the Environment Low

(High/Medium/Low or unknown) An Environmental Monitoring Plan (EMP) was prepared for this drought order in 2007. The EMP does not constitute an Summary of likely Environmental Assessment Report (EAR) which would describe environmental impacts the potential impacts of drought order implementation on Include details for features sensitive features. However, the EMP does present a of moderate and major hydrological assessment which lists the likely impacts of sensitivity and minor drought order implementation on the flow/level regime in the sensitivity features from impacted waterbodies. In the absence of an EAR, professional Environmental Assessment Assessment Environmental designated sites judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological

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receptors. The EMP was prepared on the basis of increased abstraction of 0.5Ml/d, however, the option currently proposed is 0.1Ml/d. The zone of hydrological influence of drought order implementation includes the River Teme (a total of 5.1km, minor hydrological impact), the River Clun (a total of 1.3km, minor hydrological impact) and an unnamed ditch (hydrological impact unknown). Impacts of the 0.1Ml/d increase in abstraction are likely to be negligible-minor. Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including freshwater pearl mussel), macrophytes and fish (including brown/sea trout, eel, lamprey species and Atlantic salmon) are unknown, but are consdiered unlikely to be significant. The River Clun is designated as both an SAC and SSSI. The changes to the flow and level regime as a result of drought order implementation are unknown, but are considered unlikely to result in significant impacts on designated features of the River Clun SAC and SSSI. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought Summary of additional order for: river flows, river cross section and wetted area, baseline monitoring ditched wetted depth, groundwater levels and abstractions, requirements geomorphology, physico-chemical water quality, phytoplankton, salmonids, bullhead, lamprey, macroinvertebrates, white clawed crayfish (if present), freshwater pearl mussel and macrophytes. Mitigation measures were identified in the EMP. These include: Reestablishment of macrophyte communities in impacted reaches, artificial channel narrowing, habitat enhancement, installation of flow deflectors, fish rescue in consultation with Mitigation measures EA and/or restocking using offspring of broodstock from the catchment, removal of freshwater pearl mussels to hatchery, archaeology mitigation to be discussed with relevant parties (if required). No significant impacts on landscape and visual amenity and recreation are anticipated. Impacts on angling may be significant. The EMP identified that several features of Impact on other activities archaeological and cultural heritage importance may be e.g. fisheries, industry etc impacted by changes to flow and level regime within the zone of influence of drought order implementation. Further assessment is required to determine the magnitude of impacts

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on these features.

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Llyswen - 8105

Location Plan 14 - Llyswen Water Resource Zone

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Llyswen Water Resources No. Location Licence No. Type

Regulated river (but River Wye at 1 19/55/06/0076 abstraction not a Llyswen component of regulation) Table 26 - Llyswen abstraction licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A28. Drought actions for this WRZ are given in Table A28. Current Resource Status A single source supplies this WRZ and is based on an abstraction from the River Wye at Llyswen. The abstraction is licensed for a maximum of 5 Ml/d. Low flows in the Wye are augmented by the regulation releases from the Elan Valley reservoirs therefore, the Llyswen abstraction as a proportion of the Wye flows is modest. Whilst the regulation releases enhance the flows at Llyswen, the abstraction is not dependent upon the regulation releases. The Llyswen licence remains essentially un-restricted except for the licensed daily and annual quantities. The augmented River Wye flows demonstrate that there is little likelihood of there being insufficient resource to sustain the Llyswen abstraction even under conditions of severe drought and the most likely problem will be that of exceeding the licensed daily maximum quantity. For 2012/13 the average demand was 2.2 Ml/d and the peak week demand was 2.7 Ml/d.

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Llyswen Drought Action Zones

4.50

4.00

3.50

3.00

2.50 Mld 2.00

1.50

1.00 Normal operation 0.50

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Developing drought zone Drought to severe drought zone

Figure 20 - Llyswen Drought Action Zones

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within Use the water that you need but please don’t waste it levels. operational rules and within quality constraints General Water Efficiency Campaigns via: Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ and - Water Efficiency Web Page ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison with operational Use what you need but please don’t waste water. Drought water conservation measures through the established colleagues and NRW in line with Management We increasingly need your help to conserve water supplies. media campaigns as per the communication plan and Communications Plan. which will include requests for voluntary restraint. We are also doing our bit by ensuring we fix leaks quickly to Welsh Water will continue to monitor the rate prevent waste Progress ‘Media Campaigns with Water Efficiency of abstraction at Llyswen. When the demand Device Offering’ option rises above 85% of the licensed amount Welsh Continuation of Normal Activities plus Enhanced targeted Water may also use this threshold as the basis Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ option for calling the Drought Liaison meeting. - Local Radio Supply / demand situation continually monitored Review and implement where feasible throughout the drought situation and the tankering to support lower resource areas. - Target social media effectiveness of demand-side measures. - Prepare and Publish DCWW Drought Web Page Continuation of preceding options. TUB consultation via Printed media Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last resort demand-side measures to be included in media to help conserve water supplies Implement environmental monitoring in line campaign and as aligned with the communication with Monitoring Plan. Ask you to respect this to ensure supplies to people in the plan.) area are conserved Review current operational activities to Introduction of TUBs (Saving of 0 – 5% demand, 0 – preserve resource. Thank you in advance for your cooperation 0.11 Ml/d). Continue to review and implement where Implement TUBS Continuation of preceding options. feasible tankering to support lower resource

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areas. Preplanning for the implementation of NEUBs. Continuation of Previous Techniques plus Enhanced Prepare Drought Order applications. messaging via: - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies

Severe Continuation of preceding options. Having implemented the above measures and Continuation of Previous Activities with the enhanced Drought should demand on the works still remain message Increasing public awareness and content of new above 4.4 Ml/d, Welsh Water would pursue a demand-side measures to be included in media We appreciate your help so far in observing the temporary Drought Order for supply side option 8105.D1 campaign and as aligned with the communication use restrictions plan.) Water levels are at very low levels so we ask you think Introduction of NEUBs (Saving of 0 – 5% NHH demand, carefully about the waster you use 0 – 0.03 Ml/d). Urge you not to waste any water Implementation of Emergency Drought Orders as Last Implementation of NEUB Resort (Saving likely 0-10%, 0 – 0.22 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies

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Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 27 - Llywen Drought Action Sequence of Events

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Supply side options

8105.D1 - Increase the abstraction at Llyswen

Option Name Option 8105.D1 – Increase the abstraction at Llyswen

Trigger(s) Drought- Prepare Drought Order applications (or preceding actions) Severe Drought- Demand remaining above 4.4 Ml/d, Yield of action Ml/day unless stated 1 Ml/d otherwise

Location

Area affected or whole Additional resource for treatment at Llyswen WTW. supply zone Total 9 weeks: 1 week application preparation time We assume a decision from WG within 28 days of submitting Implementation timetable the Drought Order application. Preparation time, time of The practical implementation of the option could be effected year effective, duration within 4 weeks. The option is most likely to be implemented during the summer and autumn period. Drought orders are valid for up to 6 months.

Permissions required and Drought Order - WG Option Implementation Assessment Implementation Option constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Non granting of Drought Order by WG. Risks associated with Availability of additional treatment and distribution assets. option Issues at the treatment works that prevent full utilisation of the additional resource. Risk to the Environment

(High/Medium/Low or Low unknown) An Environmental Monitoring Plan (EMP) was prepared for this drought order in 2007. The EMP does not constitute an Summary of likely Environmental Assessment Report (EAR) which would describe environmental impacts the potential impacts of drought order implementation on Include details for features sensitive features. However, the EMP does present a of moderate and major hydrological assessment which lists the likely impacts of sensitivity and minor drought order implementation on the flow/level regime in the sensitivity features from impacted waterbodies. In the absence of an EAR, professional Environmental Assessment Environmental designated sites judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive

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ecological receptors. Low flows in the River Wye are supported by compensation and regulation releases and the hydrological influence of drought order implementation was assessed in the EMP as negligible. No significant effects are anticipated on ecological receptors including macroinvertebrates, macrophytes and fish. The River Wye is designated as both an SAC and SSSI. The negligible hydrological changes to the flow and level regime as a result of drought order implementation are not anticipated to result in significant impacts on designated features of the River Wye SAC and SSSI. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). On a precautionary basis, the EMP recommended baseline Summary of additional monitoring, and monitoring that should be undertaken during baseline monitoring and after implementation of a drought order for: river flows, requirements river cross section and wetted area, geomorphology, physico- chemical water quality, phytoplankton, salmonids, bullhead, lamprey, shad, macroinvertebrates, freshwater pearl mussel (if present) and macrophytes. Mitigation measures were identified in the EMP. These include: Installation of flow deflectors, measures to reduce fish entrainment, habitat enhancement, physical modification to existing structures that could present as barriers to fish Mitigation measures migration, relocation of fish upstream of migratory barriers, and if identified as required, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment, removal of freshwater pearl mussels to hatchery (if present). No significant impacts on landscape and visual amenity, Impact on other activities recreation (including angling) and archaeology and cultural e.g. fisheries, industry etc heritage are anticipated.

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Monmouth - 8106

Location Plan 15 - Monmouth Water Resource Zone

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Monmouth Water Resources No. Location Licence No. Type River Wye at Monmouth Regulated river (abstraction is a 1 19/55/18/0201 (Mayhill intake) minor component of regulation) 2 Buckholt 19/55/18/0203 Spring 3 Ffynnon Gaer 19/55/21/0066 Spring Table 28- Monmouth Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A29. Drought actions for this WRZ are given in Table A29. Current Resource Status The WRZ is heavily dependent on the Mayhill abstraction from the River Wye at Monmouth, located approximately 500 metres downstream of the main abstraction for the Wye transfer scheme to Court Farm WTW. The licensed abstraction quantity for Mayhill is 6 Ml/d. Measured flows under drought conditions at the Redbrook gauging station on the River Wye downstream of Monmouth record values of over 600 Ml/d so the Mayhill abstraction is a minor proportion of the available Wye flows. The Buckholt springs supply a small high level area to the north of Monmouth and are licensed at nearly 2 Ml/d. The Ffynon Gaer springs are licensed for approximately 0.5 Ml/d and supply a small localised area south of Monmouth. Under drought conditions, it is not considered likely that additional resource would be available from these two springs. Given the size of the abstraction licence relative to the size of the River Wye flows, even under drought flow conditions, it is extremely unlikely that the WRZ will be constrained by lack of resource availability during a drought. The most likely problem would be that demand would cause the abstraction licence ceiling to be exceeded. For 2012/13 the average demand was 3.34 Ml/d and the peak week demand was 4.09 Ml/d. The River Wye is designated as a Special Area of Conservation (SAC) under the Habitats Regulations. Any changes to our authorised operation will have to reflect the sensitivities of this designation. The River Wye SAC has been subject to the Review of Consents process undertaken by the then Environment Agency Wales (now Natural Resources Wales (NRW)) to meet their obligations under the EU Habitats Directive. The assessment considers the river flow requirements needed to support the designated species and the potential impact from our operations. We are still awaiting a final agreed position for our Mayhill abstraction licence. Once received, we will assess the impact on our operations during a drought and consider modifying the Drought Plan accordingly.

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Monmouth Drought Action Zones

6.00

5.00

4.00

3.00 Mld

2.00

Normal operation

1.00

0.00

Developing drought zone Drought to severe drought zone

Figure 21 - Monmouth Drought Action Zones

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, within Use the water that you need but please don’t waste demand levels. operational rules and within quality constraints it Ongoing leakage maintenance and water General Water Efficiency Campaigns via: efficiency work streams. - Radio Preplanning for the implementation of ‘Media - Education Centres Campaign with Water Efficiency Device Offering’ and ‘Enhanced Leakage Management’ option. - Water Efficiency Web Page Developing Raise and increase awareness of the importance Commence increased liaison with operational Use what you need but please don’t waste water. Drought of water conservation measures through the colleagues and NRW in line with Management and We increasingly need your help to conserve water established media campaigns as per the Communications Plan. supplies. communication plan which will include requests Rate of abstraction at Mayhill exceeds 85% Welsh for voluntary restraint. We are also doing our bit by ensuring we fix leaks Water to call the Drought Liaison meeting. quickly to prevent waste Progress ‘Media Campaigns with Water Efficiency Review and implement where feasible tankering to Device Offering’ option Continuation of Normal Activities plus Enhanced support lower resource areas. targeted Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ option - Local Radio Supply / demand situation continually monitored - Target social media throughout the drought situation and the effectiveness of demand-side measures. - Prepare and Publish DCWW Drought Web Page Continuation of preceding options. TUB consultation via Printed media Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources and We’ve introduced a temporary hosepipe ban as a demand-side measures to be included in media review operations to preserve resource. last resort to help conserve water supplies campaign and as aligned with the communication When demand exceeds 5.2 Ml/d at Mayhill WTW Ask you to respect this to ensure supplies to people plan.) the link to the Wye Transfer raw water main will in the area are conserved Introduction of TUBs (Saving of 0 – 5% demand, 0 commence. Should demand exceed this figure the Thank you in advance for your cooperation – 0.17 Ml/d). effect would be for the higher parts of the WRZ to experience loss of pressure, and customers Implement TUBS Continuation of preceding options. suffering periods of loss of supply. Continuation of Previous Techniques plus Enhanced Preplanning for the implementation of NEUBs. Consider tankering either from the adjacent

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Talybont area of SEWCUS or Hereford Conjunctive messaging via: Use WRZ. - Local Radio The usage of Wye Transfer water to support - Targeted social Media Monmouth (Mayhill) inevitably causes a minor reduction in the available quantity for transfer to - Plus Call Centre Pre recorded Messages Court Farm. Under extreme events the Wye Transfer (see the plan for SEWCUS) may even be - Targeted messaging through texting service unsupported for abstraction quantities in excess of Media interviews with Senior Managers produced via 118 Ml/d abstraction at Monmouth. Such a severe TV and Radio operation would require a Drought Order (see section for Sluvad/ Court Farm/ Llwynon area, Preparation for NEUB Via Chamber of Commerce and SEWCUS WRZ), which would require demand Trade Bodies restrictions to be in operation in the Sluvad/ Court Farm/ Llwynon area. Imposition of restrictions in the Monmouth (Mayhill) WRZ at the same time would appear consistent. Severe Continuation of preceding options. In the event that the demand management Continuation of Previous Activities with the Drought measures were insufficient to reduce demand enhanced message Increasing public awareness and content of new below 6 Ml/d and some parts of the WRZ were still demand-side measures to be included in media We appreciate your help so far in observing the suffering loss of pressure and loss of supply, campaign and as aligned with the communication temporary use restrictions additional temporary treatment plant would be plan.) used at Mayhill to make more use of the Wye Water levels are at very low levels so we ask you Introduction of NEUBs (Saving of 0 – 5% NHH Transfer quantity. think carefully about the waster you use demand, 0 – 0.04 Ml/d). Urge you not to waste any water Implementation of Emergency Drought Orders as Implementation of NEUB Last Resort (Saving likely 0-10%, 0 – 0.33 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 29 - Monmouth Drought Action Sequence of Events

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Pilleth - 8107

Location Plan 16 - Pilleth Water Resource Zone

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Pilleth Water Resources No. Location Licence No. Type 1 Pilleth 19/55/08/0179 Borehole Table 30 - Pilleth Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A30. Drought actions for this WRZ are given in Table A30. Current Resource Status The WRZ is supplied from a single source of four boreholes located in the gravel aquifer adjacent to the Upper Lugg at Pilleth. The resource is licensed for a maximum abstraction of 3.82 Ml/d. Industrial usage in Presteigne is a disproportionately large component of demand in this WRZ. The WRZ also extends into the adjacent catchment of the River Teme and serves Knighton. For 2012/13 the average demand was 2.03 Ml/d with a peak week demand of 2.44 Ml/d. Pump testing undertaken during 2004/ 2005 demonstrated that the gravel aquifer can sustain an output of 5 Ml/d. Therefore, we do not consider that the WRZ is resource constrained. It is more likely that there would be problems associated with demand exceeding the abstraction licence conditions during drought conditions. The Pilleth WRZ, in the headwaters of the River Lugg, falls within the River Wye Special Area of Conservation (SAC), which is designated under the Habitats Regulations. As such any changes to the operation of the site will need to reflect the sensitivity of the designation. The River Wye SAC has been subject to the Review of Consents process undertaken by the then Environment Agency Wales (now Natural Resources Wales (NRW)) to meet their obligations under the EU Habitats Directive. The assessment concluded the need to modify our Pilleth abstraction licence to include an additional low flow condition that restricts total abstraction out of the River Lugg catchment.

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Pilleth Drought Action Zones

4.50

4.00

3.50

3.00

2.50 Mld 2.00

1.50

1.00 Normal operation 0.50

0.00

Developing drought zone Drought to severe drought zone

Figure 22 - Pilleth Drought Action Zones

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Drought Actions – Sequence of Events Resource Position Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within Use the water that you need but please don’t waste it levels. operational rules and within quality General Water Efficiency Campaigns via: constraints Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ and - Water Efficiency Web Page ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison with Use what you need but please don’t waste water. Drought water conservation measures through the established operational colleagues and NRW in line with We increasingly need your help to conserve water supplies. media campaigns as per the communication plan which Management and Communications Plan. will include requests for voluntary restraint. We are also doing our bit by ensuring we fix leaks quickly to Review and implement where feasible prevent waste Progress ‘Media Campaigns with Water Efficiency tankering to support lower resource areas. Device Offering’ option Continuation of Normal Activities plus Enhanced targeted

Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ option

- Local Radio Supply / demand situation continually monitored throughout the drought situation and the effectiveness - Target social media of demand-side measures. - Prepare and Publish DCWW Drought Web Page Continuation of preceding options. TUB consultation via Printed media Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Implement environmental monitoring in line We’ve introduced a temporary hosepipe ban as a last resort demand-side measures to be included in media with Monitoring Plan. to help conserve water supplies campaign and as aligned with the communication Review current operational activities to Ask you to respect this to ensure supplies to people in the plan.) preserve resource. area are conserved Introduction of TUBs (Saving of 0 – 5% demand, 0 – Continue to review and implement where Thank you in advance for your cooperation 0.10 Ml/d). feasible tankering to support lower resource Implement TUBS Continuation of preceding options. and/ or from neighbouring zone. Continuation of Previous Techniques plus Enhanced Preplanning for the implementation of NEUBs. Prepare Drought Order/ Permit applications.

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messaging via: - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Drought Continuation of preceding options. Should demand remain above 3.5 Ml/d with Continuation of Previous Activities with the enhanced all the above demand management message Increasing public awareness and content of new measures in place, the next step would be to demand-side measures to be included in media We appreciate your help so far in observing the temporary pursue a Drought Order solution to supply campaign and as aligned with the communication use restrictions side option 8107.D1 plan.) Water levels are at very low levels so we ask you think Introduction of NEUBs (Saving of 0 – 5% NHH demand, carefully about the waster you use 0 – 0.02 Ml/d). Urge you not to waste any water Implementation of Emergency Drought Orders as Last Implementation of NEUB Resort (Saving likely 0-10%, 0.20 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Figure 23 - Pilleth Drought Action Sequence of Events

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Drought Management Options – Supply Side

8107.D1 - Increase the authorised Pilleth abstraction Increase the authorised Pilleth abstraction Option Name

Developing Drought- Prepare for Implementation Trigger(s) Drought- Implementation (or preceding actions) Severe drought- demand remains above 3.5 Ml/d Yield of action

Ml/day unless stated 1 Ml/d otherwise Location Area affected or whole Additional resource for treatment at Pilleth WTW. supply zone Total 9 weeks: 1 week application preparation We assume a decision from WG within 28 days of submitting Implementation timetable the Drought Order application. Preparation time, time of The practical implementation of the option could be effected year effective, duration within 4 weeks. The option is most likely to be implemented during the summer and autumn period. Permissions required and Option Implementation Assessment Assessment Implementation Option constraints Including details of liaison Drought Order - WG carried out with bodies responsible for giving any permits or approvals Non granting of Drought Order by WG Availability of additional treatment and distribution assets. Risks associated with option Issues at the treatment works that prevent full utilisation of the additional resource. Risk to the Environment

(High/Medium/Low or Medium unknown) An Environmental Monitoring Plan (EMP) was prepared for this drought order in 2007. The EMP does not constitute an Summary of likely Environmental Assessment Report (EAR) which would describe environmental impacts the potential impacts of drought order implementation on Include details for features sensitive features. However, the EMP does present a of moderate and major hydrological assessment which lists the likely impacts of sensitivity and minor drought order implementation on the flow/level regime in the sensitivity features from impacted waterbodies. In the absence of an EAR, professional

Environmental Assessment Assessment Environmental designated sites judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological

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receptors. The zone of hydrological influence of drought order implementation includes the River Lugg in the vicinity of the boreholes (minor to moderate hydrological impact), Bleddfa Brook (hydrological impact of unknown magnitude) and Nant-y- Groes (hydrological impact of unknown magnitude). It is noted that since the EMP was prepared, investigations have taken place to drill additional observation boreholes at this site and undertake pumping tests to establish river- aquifer connectivity. Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including white-clawed crayfish), macrophytes and fish are anticipated to be significant. The River Lugg in the zone of hydrological influence of the drought order is designated as a SSSI for features including white-clawed crayfish, bullhead, Atlantic salmon, twaite shad and coarse fish. Drought order implementation has the potential to result in significant impacts on designated features of the SSSI. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should Summary of additional be undertaken during and after implementation of a drought baseline monitoring order for: river flows, river cross section and wetted area, requirements groundwater levels, geomorphology, physico-chemical water quality, phytoplankton, salmonids, shad, bullhead, lamprey, macroinvertebrates, white clawed crayfish and macrophytes.

Mitigation measures were identified in the EMP. These include: Phased increases in groundwater abstraction rate, Installation of flow deflectors, artificial channel narrowing, creation of Mitigation measures alternative refuges in deeper water, habitat enhancement, and if identified as required, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment. No significant impacts on landscape and visual amenity, Impact on other activities recreation and archaeology and cultural heritage are e.g. fisheries, industry etc anticipated. There is the potential for significant impacts on angling.

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Brecon Portis - 8108

Location Plan 17 - Brecon Portis Water Resource Zone

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Brecon/ Portis Water Resources No. Location Licence No. Type 1 Usk Reservoir 20/56/54/0001 Impounding Reservoir 2 Nant Henwaun Intake 20/56/54/0003 Stream Intake (with residual flow) 3 Trinant Stream Intake 20/56/54/0002 River Intake (with flow constraint) 4 Brecon 20/56/44/0016 Boreholes 5 Usk at Brecon 20/56/45/0011 River Table 31 - Brecon Portis Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A31. Drought actions for this WRZ are given in Table A31. Current Resource Status Usk reservoir is situated in the headwaters of the River Usk which is designated as a Special Area of Conservation (SAC) under the Habitats Regulations. As such any changes to the operation of the site will need to reflect the sensitivity of the designation. Usk Reservoir has a capacity of 11990 Ml and has three uses: Regulation releases to the River Usk, which can support the abstraction at Prioress Mill near Usk town, on a put and take basis. From Prioress Mill Pumping Station the water is used to refill Llandegfedd Reservoir. The abstraction at Prioress Mill, operated in compliance with the abstraction licence and the current operating agreements, is an important part of the South East Wales Conjunctive Use System (SEWCUS).

A direct supply to Bryngwyn WTW that serves the Upper Tywi valley.

Supplies to Portis WTW that serve the Sennybridge area of the WRZ. Portis is a small works that typically produces around 2 Ml/d. A section of the Usk Reservoir storage is reserved for the direct supply to Portis WTW. Portis WTW is therefore not considered to be resource constrained.

Usk Reservoir is included as part of the Big 5 Drought Diagram for SEWCUS (Figure A35). However, the Operating Rules for Usk Reservoir contain a Reserved Storage area that preserves the lowest storage in Usk Reservoir for use in drought conditions. The Reserved Storage allocation amounts to approximately 2000 Ml up to mid-July. In the event of low flows typical of drought conditions, the 2000 Ml will sustain: up to 2 Ml/d for direct abstraction to Portis WTW

up to 5 Ml/d for direct abstraction to Bryngwyn WTW to balance the alternative abstraction regime from the Manoravon Pumping Station on the Tywi

9 Ml/d being the average compensation requirement for the period to mid-November whereafter refill will be increasing storage at a faster rate than supply is diminishing it.

The three Brecon boreholes, which are licensed to supply up to 5.7 Ml/d, meet the larger proportion of the WRZ demand. The boreholes are located in the gravel aquifer at Brecon, adjacent to the River Usk. During dry periods the boreholes have sustained demands of 3.6 Ml/d.

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The Trinant Stream Intake that feeds directly into Portis WTW is not normally used for production purposes and is held as a standby source. Given the storage available in Usk Reservoir and the performance of the boreholes, it is considered that this WRZ is unlikely to be at risk of a resource failure. The River Usk SAC has been subject to the Review of Consents process undertaken by the then Environment Agency Wales (now Natural Resources Wales (NRW)) to meet their obligations under the EU Habitats Directive. The assessment considers the river flow requirements needed to support the designated species and the potential impact from our operations. NRW have so far been unable to conclude ‘no adverse affect’ from our current operations and we are awaiting the formal licence modifications. Once received, we will assess the impact on our operations during a drought and consider modifying the Drought Plan accordingly. For 2012/13 the average demand was 3.6 Ml/d with a peak week demand of 3.9 Ml/d.

Brecon Portis Drought Actions Zones

4 Mld

2 Normal operation 1

Developing drought zone Drought to severe drought zone

Table 32 - Brecon Portis Drought Action Zones

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position

Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, within Use the water that you need but please don’t waste it demand levels. operational rules and within quality constraints General Water Efficiency Campaigns via: Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ - Water Efficiency Web Page and ‘Enhanced Leakage Management’ option.

Developing Raise and increase awareness of the importance of Commence increased liaison with operations Use what you need but please don’t waste water. Drought water conservation measures through the colleagues and NRW in line with Management We increasingly need your help to conserve water supplies. established media campaigns as per the and Communications Plan. communication plan which will include requests We are also doing our bit by ensuring we fix leaks quickly to Review and implement where feasible tankering for voluntary restraint. prevent waste to support lower resource areas. Progress ‘Media Campaigns with Water Efficiency Continuation of Normal Activities plus Enhanced targeted Device Offering’ option Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ - Local Radio option - Target social media Supply / demand situation continually monitored throughout the drought situation and the - Prepare and Publish DCWW Drought Web Page effectiveness of demand-side measures. TUB consultation via Printed media Continuation of preceding options. Preplanning for the implementation of TUBs and NEUBs.

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Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last resort demand-side measures to be included in media to help conserve water supplies Implement environmental monitoring in line campaign and as aligned with the communication with Monitoring Plan. Ask you to respect this to ensure supplies to people in the plan.) area are conserved Review current operational activities to preserve Introduction of TUBs (Saving of 0 – 5% demand, 0 – resource. Thank you in advance for your cooperation 0.18 Ml/d). Continue to review and implement where Implement TUBS Continuation of preceding options. feasible tankering to support lower resource Continuation of Previous Techniques plus Enhanced messaging Preplanning for the implementation of NEUBs. areas. via: Prepare Drought Order/ Permit applications. - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Drought Continuation of preceding options. Operationally and under the terms of the Continuation of Previous Activities with the enhanced existing abstraction licence, NRW is entitled to message Increasing public awareness and content of new ask Welsh Water to reduce the Usk demand-side measures to be included in media We appreciate your help so far in observing the temporary Compensation discharge from 9 Ml/d to 5.7 campaign and as aligned with the communication use restrictions Ml/d.2 We would prompt NRW if such a request plan.) has not been made. Water levels are at very low levels so we ask you think Introduction of NEUBs (Saving of 0 – 5% NHH carefully about the waster you use If, having implemented the above measures and demand, 0.05 Ml/d). demand on Portis works still remains above 2 Urge you not to waste any water Implementation of Emergency Drought Orders as Ml/d, concerns will grow if storage declines Implementation of NEUB Last Resort (Potential Saving likely 0-10%, 0 – 0.36 further. This would indicate a high risk of there

2 There is a further licence requirement that an average compensation discharge of 9 Ml/d as measured at the compensation weir should be achieved for the year (April to June). Effectively for every day that compensation is reduced from 9 Ml/d to 5.7 Ml/d, this should be matched by a day with a compensation discharge of at least 12.3 Ml/d to maintain the annual average.

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Ml/d) being inadequate storage to maintain all the Non-essential use restrictions will be implemented. This is a requirements for the Reserved Uses. In such an last resort but essential if going to conserve supplies for instance, a referral to Welsh Water Executive customers. would be made to consider applications for a drought order(s), to preserve Usk Reservoir - Local Media storage - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 33 - Brecon Portis Drought Actions Sequence of Events

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Drought Management Options – Supply Side

8108.D1 - Further reduce Usk Compensation discharge, removal of the residual flow requirement for Trinant abstraction, removal of the residual flow requirement for Nant Henwaun abstraction Option Name Further reduce Usk Compensation discharge, removal of the residual flow requirement for Trinant abstraction, removal of the residual flow requirement for Nant Henwaun abstraction Trigger(s) Drought- Prepare Drought Order applications (or preceding actions) Severe Drought- With demand management measures in place and demand on Portis works remains above 2 Ml/d, together with a significant decline in Usk storage. Yield of action

Ml/day unless stated otherwise 4.1 Ml/d. Location Additional resource for treatment at Portis and Area affected or whole supply Bryngwyn WTWs. zone Implementation timetable 6 weeks total: Preparation time, time of year 1 week application preparation effective, duration We assume a decision from WG within 28 days of submitting the Drought Order application. The practical implementation of the option could be effected within 1 week. This drought option could be implemented at any time during the year to maintain reservoir storage, and to Option Implementation Assessment Implementation Option improve reservoir refill. The drought order would be in place for up to 6 months. Permissions required and constraints Including details of liaison carried Drought Order - WG out with bodies responsible for giving any permits or approvals Risks associated with option Non granting of Drought Order by WG. Issues at the treatment works that prevent full utilisation of the additional resource. Risk to the Environment (High/Medium/Low or unknown) High

moderate and major sensitivity which would describe the potential impacts of drought Assessment

Environmental Environmental and minor sensitivity features order implementation on sensitive features. However, from designated sites the EMP does present a hydrological assessment which lists the likely impacts of drought permit implementation

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on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought order implementation includes the River Usk (major hydrological impact from Nant Henwaen confluence to Afon Hydfer confluence; and negligible to moderate impacts to confluence with Afon Cilieni), the Afon Hydfer (moderate - major hydrological impact) and the Nant Henwaen (major hydrological impact). Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including white-clawed crayfish if present), macrophytes and fish (including brown/sea trout, shad, eel, lamprey species and Atlantic salmon) may be significant. The River Usk is designated as both an SAC and SSSI. The changes to the flow and level regime as a result of drought order implementation are anticipated to result in significant impacts on designated features of the River Usk SAC and SSSI. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought order was agreed by DCWW monitoring requirements and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for: reservoir level, reservoir outflow, river flows, river cross section and wetted area, geomorphology, physico-chemical water quality, phytoplankton, salmonids, bullhead, lamprey, macroinvertebrates, white clawed crayfish, and macrophytes. Mitigation measures Mitigation measures were identified in the EMP. These include: Reestablishment of macrophyte communities in impacted reaches, artificial channel narrowing, habitat enhancement, phased changes in compensation flow regime, installation of flow deflectors, measures to reduce entrainment, creation of refuges, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment. Impact on other activities No significant effects to landscape and visual amenity, e.g. fisheries, industry etc recreation and archaeology and cultural heritage are anticipated. Impacts on angling may be significant.

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Vowchurch - 8110

Location Plan 18 - Vowchurch Water Resource Zone

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Vowchurch Water Resources

No. Location Licence No. Type 1 Vowchurch 19/55/17/0451 Boreholes Table 34 - Vowchurch abstraction licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A32. Drought actions for this WRZ are given in Table A32. Current Resource Status The WRZ is supplied by four boreholes that abstract from the gravel aquifer adjacent to the River Dore at Vowchurch, south-west Herefordshire. The River Dore is a tributary of the Monnow that in turn is a tributary of the Wye. The boreholes fall outside the Wye Special Area of Conservation (SAC) and although they are remote from the SAC, as the Monnow is only designated for the last 2 km before the Wye confluence, any changes to the licensed operation will need to reflect the sensitivity of the designation. The boreholes are licensed for a maximum daily value of 4 Ml/d. Under low river flow conditions in the adjacent River Dore (when the flow at Moorhampton Bridge flow gauging station (FGS) is less than 12.0 Ml/d) the licensed maximum daily value reduces to 3 Ml/d. Groundwater level depletion issues have not been identified in the previous operation of these boreholes, even through dry weather events in 1989 and 1995. It is considered that, hydraulically, the aquifer can sustain 4.0 Ml/d under drought conditions. Consequently, this WRZ is constrained by the abstraction licence not by the resource availability. There is a greater likelihood of exceeding the maximum licensed amount rather than suffering resource depletion. For 2012/13 the average demand for this WRZ was 2.14 Ml/d with a peak week demand of 2.55 Ml/d.

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Vowchurch Drought Action Zones

3.5

2.5

2 Mld

1.5

1 Normal zone 0.5

Developing drought zone Drought to severe drought zone

Figure 24 - Vowchurch Drought Action Zones

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, within Use the water that you need but please don’t waste it demand levels. operational rules and within quality General Water Efficiency Campaigns via: constraints Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ - Water Efficiency Web Page and ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison in line with Use what you need but please don’t waste water. Drought water conservation measures through the Communications Plan. We increasingly need your help to conserve water supplies. established media campaigns as per the Welsh Water will continue to monitor the communication plan which will include requests for We are also doing our bit by ensuring we fix leaks quickly to prevent rate of abstraction at the Vowchurch voluntary restraint. waste boreholes. Ordinarily we would set a Undertake ‘Media Campaigns with Water Efficiency threshold of demand of 85% of licensed Continuation of Normal Activities plus Enhanced targeted Water Device Offering’ option (Saving of 0 – 5% of quantity to use as a threshold for calling Efficiency Messaging via: demand). the Drought Liaison meeting. The 85% threshold is frequently exceeded in non- - Local Radio Undertake ‘Enhanced Leakage Management’ drought years and the WRZ is routinely option (Saving of 0.5 – 2% of the volume above - Target social media managed using the lower 3.0 Ml/d policy minimum leakage (PML)). abstraction ceiling. Therefore, we propose - Prepare and Publish DCWW Drought Web Page Supply / demand situation continually monitored to use the 85% of licence threshold only if TUB consultation via Printed media throughout the drought situation and the rainfall monitoring indicates developing effectiveness of demand-side measures. drought conditions. Continuation of preceding options. Review and implement where feasible tankering to support lower resource areas. Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Within WRZ support for vulnerable We’ve introduced a temporary hosepipe ban as a last resort to help demand-side measures to be included in media sources. conserve water supplies campaign and as aligned with the communication Implement environmental monitoring in Ask you to respect this to ensure supplies to people in the area are plan.) line with Monitoring Plan. conserved

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Introduction of TUBs (Saving of 0 – 5% demand). Increase supply from Hereford CU WRZ via Thank you in advance for your cooperation Aconbury SRV. Continuation of preceding options. Implement TUBS Review current operational activities to Preplanning for the implementation of NEUBs. Continuation of Previous Techniques plus Enhanced messaging via: preserve resource. - Local Radio Continue to review and implement where feasible tankering to support lower - Targeted social Media resource and/or from neighbouring zone. - Plus Call Centre Pre recorded Messages Prepare Drought Order applications. - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new If the demand management measures are Continuation of Previous Activities with the enhanced message Drought demand-side measures to be included in media in place and demand remains above 2.8 We appreciate your help so far in observing the temporary use campaign and as aligned with the communication Ml/d, a Drought Order solution will be restrictions plan.) sought for supply side option 8110.D1 Water levels are at very low levels so we ask you think carefully about Introduction of NEUBs (Saving of 0 – 5% demand). the waster you use Continuation of preceding options. Urge you not to waste any water Implementation of NEUB Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 35 - Drought Actions for Vowchurch WRZ

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Drought Management Options –Supply Side

8110.D1 - Removal of flow condition on the Rive Dore Removal of flow condition on the River Dore Option Name

Drought- Prepare Drought Order/ Permit applications. Trigger(s)

(or preceding actions) Severe Drought- If demand management measures are in place and demand remains above 2.8 Ml/d

Yield of action 1 Ml/d Ml/day unless stated otherwise Location Additional resource available at Vowchurch WTW Area affected or whole supply zone 1 week application preparation time We assume a decision from Defra within 28 days of submitting the Drought Order application. Implementation timetable The practical implementation of the option could be Preparation time, time of year effected within 1 week. effective, duration The option is most likely to be implemented during the summer and autumn period.

The drought order would be in place for up to 6 Option Implementation Assessment Implementation Option months. Permissions required and constraints Including details of liaison carried out Drought Order - Defra with bodies responsible for giving any permits or approvals Non granting of the Drought Order by Defra Risks associated with option Issues at the treatment works that prevent full utilisation of the additional resource. Risk to the Environment Medium (High/Medium/Low or unknown) An Environmental Monitoring Plan (EMP) was prepared for this drought order in 2007. The EMP does not constitute an Environmental Assessment Summary of likely environmental Report (EAR) which would describe the potential impacts impacts of drought order implementation on Include details for features of sensitive features. However, the EMP does present a moderate and major sensitivity and hydrological assessment which lists the likely impacts minor sensitivity features from of drought order implementation on the flow/level designated sites regime in the impacted waterbodies. In the absence Environmental Assessment Environmental of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological

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receptors. The zone of hydrological influence of drought order implementation includes 11.9km of the River Dore (moderate hydrological impact) and a 1.1km reach of the River Dore and 1.3km of the Turnastone Brook where the hydrological impact magnitude is unknown. Resulting impacts of changes to the flow regime on ecological features including macrophytes, macroinvertebrates and fish are considered and anticipated to be significant. No designated sites have been identified that have the potential to be impacted during drought order implementation. An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Baseline information used Studies have been undertaken as part of an RSA study and in addition, a programme of environmental monitoring was undertaken in 2012. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be Summary of additional baseline undertaken during and after implementation of a monitoring requirements drought order for river flows, river cross section and wetted area, groundwater levels, geomorphology, physico-chemical water quality, salmonids, bullhead, lamprey, macroinvertebrates and macrophytes. Mitigation measures were identified in the EMP. These include: Phased increases in groundwater abstraction rate, installation of flow deflectors, artificial channel Mitigation measures narrowing, habitat enhancement and if identified as required, fish rescue in consultation with EA and/or restocking using offspring of broodstock from the catchment. Two features of archeological and cultural heritage which have the potential to be impacted by drought order implementation were identified in the EMP; Mottes at Chanstone and Dore Abbey, however, the Impact on other activities significance of potential impacts on these sites is not e.g. fisheries, industry etc yet known. Angling and canoeing may be significantly impacted by drought order implementation. No significant impacts on landscape and visual amenity are anticipated.

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Whitbourne - 8111

Location Plan 19 - Whitbourne Water Resource Zone

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Whitbourne Water Resources No. Location Licence No. Type 1 Whitbourne WTW 18/54/09/0008 Run of river with conditions Table 36 - Whitbourne Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A33. Drought actions for this WRZ are given in Table A33. Current Resource Status The WRZ is located in east Herefordshire adjacent to the Worcestershire border. The supply is from a single abstraction from the River Teme at Whitbourne some 20 km upstream of the Teme confluence with the River Severn. The Severn catchment is designated as a Special Area of Conservation (SAC) under the Habitat Regulations, and whilst the Teme does not have SAC status, any changes to our abstraction operations from a tributary of a SAC have to be managed with sensitivity appropriate to these designations. The Teme and the Severn catchments are the responsibility of the Midlands region of the Environment Agency. The Whitbourne abstraction licence authorises a maximum daily abstraction of 9 Ml/d but is subject to a series of complex conditions which result in a reduced abstraction quantity when the flow in the Teme measured upstream at Tenbury Wells falls below a threshold of 159 Ml/d. Under drought conditions the measured flow at Tenbury can decline to 50 Ml/d. The reduced abstraction quantity is not a fixed value and is recalculated each year. Overall the minimum derived abstraction value has always been above 7 Ml/d. Given the size of the Teme flow under drought conditions, the abstraction is not constrained by lack of available resource but by the licence. Operationally it is possible for limited support to be provided from Broomy Hill WTW (Hereford CU WRZ) through network adjustment. For 2012/13 the average demand was 4.46 Ml/d and the peak week demand was 5.45 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within Use the water that you need but please don’t waste it levels. operational rules and within quality General Water Efficiency Campaigns via: constraints Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ and - Water Efficiency Web Page ‘Enhanced Leakage Management’ option. Developing Welsh Water will continue to monitor the rate of Commence increased liaison in line with Use what you need but please don’t waste water. Drought abstraction from the Teme at Whitbourne. Raise and Communications Plan. We increasingly need your help to conserve water supplies. increase awareness of the importance of water It is likely that in this same period the conservation measures through the established media We are also doing our bit by ensuring we fix leaks quickly to Midlands EA would advise of 1st restriction campaigns as per the communication plan which will prevent waste level of river flow in the Teme. This is the include requests for voluntary restraint. precursor to the imposition of the reduced Continuation of Normal Activities plus Enhanced targeted Water Undertake ‘Media Campaigns with Water Efficiency rate of abstraction. Additionally when Efficiency Messaging via: Device Offering’ option (Saving of 0 – 5% of demand). weekly demand for the WRZ is within 1 Ml/d of the licensed amount, the Risbury - Local Radio Undertake ‘Enhanced Leakage Management’ option pumping station will be brought into (Saving of 0.5 – 2% of the volume above policy - Target social media operation to move approximately 0.5 Ml/d minimum leakage (PML)). of demand from the Whitbourne source - Prepare and Publish DCWW Drought Web Page Supply / demand situation continually monitored and transfer it to the Hereford CU WRZ. TUB consultation via Printed media throughout the drought situation and the effectiveness Review and implement where feasible of demand-side measures. tankering to support lower resource areas. Continuation of preceding options. Preplanning for the implementation of TUBs and NEUBs. Drought If demand remains within 1 Ml/d of the Whitbourne Within WRZ support for vulnerable We’ve introduced a temporary hosepipe ban as a last resort to help licensed amount, a referral will be made to the Welsh sources. conserve water supplies Water Executive to consider the demand management Implement environmental monitoring in Ask you to respect this to ensure supplies to people in the area are alternatives: line with Monitoring Plan. conserved

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Increasing public awareness and content of new Review current operational activities to Thank you in advance for your cooperation demand-side measures to be included in media preserve resource. Implement TUBS campaign and as aligned with the communication plan.) Review need for tankering. Continuation of Previous Techniques plus Enhanced messaging via: Introduction of TUBs (Saving of 0 – 5% demand). Prepare Drought Order applications. - Local Radio Continuation of preceding options. - Targeted social Media Preplanning for the implementation of NEUBs. - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new After implementation of the above Continuation of Previous Activities with the enhanced message Drought demand-side measures to be included in media measures and should weekly demand We appreciate your help so far in observing the temporary use campaign and as aligned with the communication plan.) remain within 1 Ml/d of licensed amount, restrictions Welsh Water would seek a Drought Order Introduction of NEUBs (Saving of 0 – 5% demand). solution for supply side option 8111.D1 Water levels are at very low levels so we ask you think carefully Continuation of preceding options. about the waster you use Urge you not to waste any water Implementation of NEUB Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 37 - Whitbourne Drought Actions Sequence of Events

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Drought Management Options - Supply Side

8111.D1 - Removal of flow condition on the River Teme

Option Name Removal of flow condition on the River Teme

Drought- Prepare Drought Order/ Permit applications.

Trigger(s) Severe Drought- should weekly demand remain within 1 Ml/d (or preceding actions) of licensed amount, Welsh Water would seek a Drought Order solution Yield of action Ml/day unless stated Potentially 1.5 Ml/d otherwise Location Area affected or whole Additional resource for treatment at Whitbourne WTW supply zone We assume a decision from Defra within 28 days of submitting the Drought Order application. Implementation timetable The practical implementation of the option could be effected

Preparation time, time of within 2 weeks. year effective, duration The option is most likely to be implemented during the summer. The drought order would be in place for up to 6 months. Permissions required and constraints Including details of liaison Drought Order - Defra carried out with bodies responsible for giving any permits or approvals Non-granting of Drought Order by Defra Risks associated with Issues at the treatment works that prevent full utilisation of option

the additional resource. Option Implementation Assessment Assessment Implementation Option Risk to the Environment (High/Medium/Low or Medium unknown)

An Environmental Monitoring Plan (EMP) was prepared for this drought order in 2007. The EMP does not constitute an Summary of likely Environmental Assessment Report (EAR) which would describe environmental impacts the potential impacts of drought order implementation on Include details for features sensitive features. However, the EMP does present a of moderate and major hydrological assessment which lists the likely impacts of sensitivity and minor drought order implementation on the flow/level regime in the sensitivity features from impacted waterbodies. In the absence of an EAR, professional designated sites judgement has been used to determine the likely significance

of the effects of flow/level regime changes on sensitive Environmental Assessment Environmental

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ecological receptors. The zone of hydrological influence during drought order implementation includes River Teme from Whitbourne intake to the confluence with Sapey brook (2.4km, minor hydrological impact). Resulting impacts of the changes to the flow regime on ecological features including macrophytes, macroinvertebrates (including freshwater pearl mussel and white-clawed crayfish) and fish (including Atlantic salmon, and lamprey species) may be significant. The River Teme is a designated SSSI for species including Ranunculion fluitans, shad, lamprey species, white-clawed crayfish, freshwater pearl mussel, Atlantic salmon and otter. Impacts of drought order on the SSSI are anticipated to be significant. The EMP prepared in 2007 utilised available information from surveys and investigations undertaken by DCWW and NRW. In Baseline information used addition, a programme of environmental monitoring was undertaken in 2012. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that Summary of additional should be undertaken during and after implementation of a baseline monitoring drought permit for: river flows, river cross section and wetted requirements area, physico-chemical water quality, salmonids, bullhead, lamprey species, shad, macroinvertebrates, freshwater pearl mussel and white clawed crayfish. Mitigation measures were identified in the EMP. These include: Installation of flow deflectors, habitat enhancement, changes to abstraction volumes to be implemented gradually, artificial Mitigation measures channel narrowing, measures to reduce entrainment, and if identified as required, fish rescue in consultation with EA and/or restocking using offspring of broodstock from the catchment, removal of freshwater pearly mussels to hatchery. No significant impacts on landscape and visual amenity, Impact on other activities recreation and archaeology and cultural heritage are e.g. fisheries, industry etc anticipated. Impacts on angling may be significant.

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South East Wales Conjenctive Use System (SEWCUS) - 8121

Location Plan 20 - SEWCUS Water Resource Zone

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SEWCUS Water Resources No. Location Licence No. Type 1 Usk Reservoir 20/56/54/0001 Impounding Reservoir 2 Talybont Reservoir 20/56/41/0007 Impounding Reservoir 3 Llandegfedd Reservoir 20/56/13/0017 Pump Storage Reservoir 4 Llwynon Reservoir 21/57/21/0001 Impounding Reservoir 5 Cantref Reservoir 21/57/21/0001 Impounding Reservoir 6 Beacons Reservoir 21/57/21/0001 Impounding Reservoir 7 Pontsticill Reservoir 21/57/21/0002 Impounding Reservoir 8 Neuadd Reservoir 21/57/21/0002 Impounding Reservoir Table 38 - SEWCUS Abstraction licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A34. Drought Control Lines have been defined for the Big 5 set of reservoirs as shown in Figure A35 and drought actions are given in Table A34. Current Resource Status This is the largest of Welsh Water’s 24 WRZ’s and serves some 1.25 million domestic customers. In total, there are over 40 resources that are used to supply the SEWCUS WRZ which include a mixture of relatively small upland reservoir sources with small catchment areas and river abstractions from the larger rivers in the east of the WRZ. The abstractions from the River Wye and River Usk in the east of the WRZ are taken from the lowland stretches of the rivers and are supported by large catchment areas which are able to sustain the abstractions for longer. Under low river flow conditions the abstraction from the Wye at Monmouth is maintained by regulation releases from the Elan Valley Reservoirs3 in the headwaters of the Wye. The regulation arrangements for the River Wye are subject to a Section 20 Operating Agreement with EAW. The SEWCUS WRZ is integrated to allow supplies from the lowland river sources to be transferred further west and north, through the WRZ, to relieve the demand on the smaller upland impounding reservoirs whose storage declines relatively quickly in dry weather. This preserves the storage in the smaller sources and allows them to supply their immediate demand areas through an extended drought. Of the 40 sources that supply the SEWCUS WRZ, there are five major reservoir systems (the “Big 5”), which provide the major proportion of the water going into supply. These are: Usk Reservoir Talybont Reservoir Llandegfedd Reservoir Taf Fawr Reservoirs (Llwynon, Cantref & Beacons Reservoirs) Taf Fechan Reservoirs (Pontsticill & Neuadd Reservoirs)

3 See also Water Resource Zone “Elan/ Builth” in the South East section of the report.

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Llandegfedd Reservoir relies on the abstraction from the River Usk at Prioress Mill to maintain the storage and the licensed rate of abstraction at Prioress Mill is governed as a proportion of the daily river flow above the Hands-Off-Flow threshold of 455 Ml/d. Probably the single most important element within SEWCUS is the Llwynon/ Sluvad/ Court Farm system. In practice, the performance of most of the other areas in SEWCUS are reliant on the Llwynon/ Sluvad/ Court Farm resources to sustain them through a drought equivalent to any of the severe events on record. Should the Llwynon/ Sluvad/ Court Farm resources come under genuine risk of failure, historically, it has been the residual flow in the River Usk that has provided emergency supplies for potable water needs and necessary Drought Order powers were obtained during 1976, 1984 and 1989. However, improvements in the overall transmission network within SEWCUS now enables resources to be moved more easily through the system and this should avoid the need for such emergency abstractions from the River Usk on all but the most severe events. Modelling of the existing system performance suggests that, in keeping with Welsh Water’s Level of Service, droughts such as 1976, 1984 and 1989 would now be manageable without the need for a River Usk Drought Order. Monitoring the combined storage position of the Big 5 throughout the year provides a clear insight into the overall resource position within the SEWCUS area and we use the Big 5 storage as the principal monitor for drought management purposes. For 2012/13 the average demand was 363.78 Ml/d with a peak week demand of 399.26 Ml/d. The Rivers Usk and Wye are both designated as a Special Area of Conservation (SAC) under the Habitats Regulations. Any changes to our authorised operation will have to reflect the sensitivities of this designation. Both rivers have been subject to the Review of Consents process undertaken by the then Environment Agency Wales (now Natural Resources Wales (NRW)) to meet their obligations under the EU Habitats Directive. The assessment considers the river flow requirements needed to support the designated species and the potential impact from our operations. The NRW have been unable to conclude ‘no adverse affect’ from our current operations and are proposing to modify our abstraction licences within the River Usk and Wye SACs. We are awaiting formal licence modifications so that we can assess the impact on our operations during a drought and will amend the Drought Plan accordingly.

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Drought Increasing public awareness and content of new Within WRZ support for vulnerable We’ve introduced a temporary hosepipe ban as a last resort to demand-side measures to be included in media sources. help conserve water supplies campaign and as aligned with the communication plan.) Implement environmental monitoring in Ask you to respect this to ensure supplies to people in the area Introduction of TUBs (Saving of 0 – 5% demand - 18.19 line with Monitoring Plan. are conserved Ml/d).

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Continuation of preceding options. Review current operational activities to Thank you in advance for your cooperation preserve resource. Preplanning for the implementation of NEUBs. Implement TUBS Continue to review and implement where Continuation of Previous Techniques plus Enhanced messaging via: feasible tankering to support resources and/ or neighbouring areas - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new If storage continues to decline into the Continuation of Previous Activities with the enhanced message Drought demand-side measures to be included in media Severe Drought zone, further measures We appreciate your help so far in observing the temporary use campaign and as aligned with the communication plan.) would be initiated. The measures apply to restrictions the whole of the SEWCUS WRZ. To explain Introduction of NEUBs (Saving of 0 – 5% NHH demand – these measures the SEWCUS WRZ has Water levels are at very low levels so we ask you think carefully 3.62 Ml/d). been divided into six areas: about the waster you use Continuation of preceding options. Llwynon/ Sluvad/ Court Farm Urge you not to waste any water Rhondda Implementation of NEUB Cynon Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. Talybont - Local Media Pontsticill High Level - Text Service Pontsticill Low Level Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 39 - SEWCUS Drought Actions Sequence of Events

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Figure 25 – SEWCUS ‘Big 5’ Drought Action Zones

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SEWCUS – Cynon – 8113

Location Plan 21 - Cynon Area

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Cynon Water Resources No. Location Licence No. Type 1 River Dare at Bwllfa Dare 21/57/23/0048 Run of river with conditions Penderyn Reservoir & 2 21/57/23/0002 Impounding reservoir Associated Sources 3 Nant Hir Reservoir 21/57/23/0006 Run of river with conditions 4 Nant Moel Reservoir 21/57/23/0005 Impounding Reservoir 5 Penderyn Borehole 21/57/23/0060 Borehole 6 Nant Clydach intakes 21/57/25/0001 Stream intakes Table 40 - Cynon Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the locations of the resources are shown in Location Plan 21.

Current Resource Status The normal operation of this area depends upon the Penderyn Reservoir supplying Hirwaun WTW. The area is supported by the Cynon link from SEWCUS, which supplies water from the Pontsticill High Level area into the area previously served by Bwllfa Graig WTW (now mothballed). Penderyn Reservoir has no catchment area and is reliant on the support of three separate resource systems, shown below in order of preferred use, to maintain storage: the Bodwigiad and Nant y Bwllfa streams (the Associated sources) Nant Hir and Nant Moel Reservoirs Penderyn borehole Neither Penderyn Reservoir nor the Nant Hir and Nant Moel reservoirs are required to release compensation discharges, so all the incoming resource is used for public water supply. Under normal operation the two stream sources at Nant y Bwllfa and Bodwigiad are sufficient to maintain storage in Penderyn Reservoir. Under low flow conditions, both the Bodwigiad and Nant y Bwllfa streams are required to maintain modest informal residual flow conditions to sustain raw supplies for local livestock watering. During a severe drought the quantities available for public supply from these sources are negligible. However, the intake arrangements allow any flow in excess of the informal residual flow arrangements to automatically gravitate to the Penderyn reservoir. Penderyn borehole, which is pumped to Penderyn Reservoir, is licensed for a maximum of 4 Ml/d and an annual average of 3 Ml/d. The borehole is used to reduce the rate of storage decline in Penderyn Reservoir when the other small gravity sources have been exhausted. Output from this borehole is considered reliable at the maximum rate throughout a severe drought. Following the dry summer of 2010, a new infrastructure main has been laid from Penderyn reservoir to support Llyn Fawr reservoir, in the Rhondda system. This will enable the balancing of raw water sources across both valleys in the event of dry weather.

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The treatment capacity of Hirwaun WTW (served by Penderyn Reservoir) limits the use of resources in the area. Given the output ceiling of Hirwaun WTW, 75% of the demands are supplied by sources outside the Cynon area, principally from the Pontsticill High Level and Low Level systems. Other than maximising the Hirwaun WTW output, to minimise the demand on the two Pontsticill systems, there are no other demand drivers on the Cynon resources. For 2012/13 the average demand was 14.54 Ml/d with a peak week demand of 16.25 Ml/d..

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Continuation of Normal Activities plus Enhanced targeted Undertake ‘Enhanced Leakage Management’ option Water Efficiency Messaging via: (Saving of 0.5 – 2% of the volume above policy minimum leakage (PML)). - Local Radio Supply / demand situation continually monitored - Target social media throughout the drought situation and the effectiveness of demand-side measures. - Prepare and Publish DCWW Drought Web Page Continuation of preceding options. TUB consultation via Printed media Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Within WRZ support for vulnerable We’ve introduced a temporary hosepipe ban as a last demand-side measures to be included in media sources. resort to help conserve water supplies campaign and as aligned with the communication plan.) Implement environmental monitoring Ask you to respect this to ensure supplies to people in the Introduction of TUBs (Saving of 0 – 5% demand). in line with Monitoring Plan. area are conserved Continuation of preceding options. Review current operational activities Thank you in advance for your cooperation to preserve resource. Preplanning for the implementation of NEUBs. Implement TUBS Continue to review and implement Continuation of Previous Techniques plus Enhanced where feasible tankering to support messaging via: lower resource and/ or from

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neighbouring zone. - Local Radio Prepare Drought Permit application. - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new If all the above demand restrictions are Continuation of Previous Activities with the enhanced Drought demand-side measures to be included in media in operation and storage on the Big 5 message campaign and as aligned with the communication plan.) Drought Diagram declines into the We appreciate your help so far in observing the temporary Severe Drought area, a Drought Permit Introduction of NEUBs (Saving of 0 – 5% demand). use restrictions solution will be sought for supply Continuation of preceding options. sideoption 8113.D1 Water levels are at very low levels so we ask you think carefully about the waster you use Urge you not to waste any water Implementation of NEUB Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 41 - Cynon Drought Actions Sequence of Events

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Drought Management Options –Supply Side

8113.D1 - Removal of flow condition on the River Dare at Bwllfa Dare

Option Name Removal of flow condition on the River Dare at Bwllfa Dare

Drought- Prepare for Implementation Trigger(s) Severe drought- Implement option if agreed appropriate (or preceding actions) response by Welsh Water Executive Yield of action 5.5 Ml/d (5 Ml/d from the normal licensed abstraction and 0.5 Ml/day unless stated Ml/d from the removal of the flow condition) otherwise Location Area affected or whole supply zone 1 week application preparation time

We assume a decision from NRW within 14 days of submitting Implementation timetable the Drought Permit application. Preparation time, time of The drought permit would be in place for up to 6 months. year effective, duration The practical implementation of the option may take more than 18 months due to the likely refurbishment requirementsa at the WTW

Permissions required and The Bwllfa Dare abstraction is mothballed yet has been constraints

Option Implementation Assessment Implementation Option retained for emergency use. Should the source be required, a Including details of liaison Drought Permit would also be sought to remove the residual carried out with bodies flow condition on the River Dare (0.45 Ml/d). responsible for giving any Drought Permit - NRW permits or approvals Non granting of Drought Permit by NRW. Ability to re-instate the source with the necessary assets. Issues at the treatment works that prevent full utilisation of Risks associated with the additional resource. option Timescales – there is uncertainty about the timeframes required to implement this option due to practical engineering requirements Risk to the Environment (High/Medium/Low or

unknown) Summary of likely environmental impacts Unknown: This option has been determined during the draft

Include details for features drought plan process. The Generic Environmental Plan will be

Assessment Environmental Environmental of moderate and major applied to this site, and a site specific Environmental sensitivity and minor Monitoring Plan will be produced with a Drought Plan review. sensitivity features from

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designated sites

Baseline information used

Summary of additional baseline monitoring To be confirmed requirements

Mitigation measures To be confirmed

Impact on other activities To be confirmed e.g. fisheries, industry etc

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SEWCUS - Llwynon / Sluvad / Court Farm – 8109

Location Plan 22 - Llwynon / Sluvad / Court Farm area

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Llwynon/ Sluvad/ Court Farm Water Resources No. Location Licence No. Type 1 Llwynon 21/57/21/0001 Impounding Reservoir Pump Storage 2 Llandegfedd 20/56/13/0017 Reservoir 3 Prioress Mill Intake 20/56/22/0027 River abstraction 4 Grwyne Fawr 20/56/34/0018 Impounding Reservoir 5 Llantrisant Intake 20/56/21/0034 River abstraction Regulated River 6 Monmouth Intake 19/55/18/0408 abstraction 8 Wentwood 20/56/72/0018 Impounding Reservoir 9 Rogerstone Grange 19/55/21/0056 Borehole 11 Pant yr Eos 20/56/11/0007 Impounding Reservoir 12 Ynys y Fro 20/56/11/0005 Impounding Reservoir 13 Severn Tunnel (Great Spring) 19/55/21/0108 Spring abstraction Table 42 - Llwynon / Sluvad / Court Farm Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A38. Drought actions for this WRZ are given in Table A37.

Current Resource Status Llwynon Reservoir and WTW supply water under gravity towards Cardiff. The abstraction from the River Usk at Prioress Mill via Llandegfedd Reservoir supplies Sluvad WTW. The water from Sluvad WTW is pumped north towards Pontypool and south westerly towards Cardiff. Grwyne Fawr Reservoir, located on a tributary of the River Usk in the Black Mountains, is not operational as a direct supply reservoir following the closure of the associated WTW. The source is retained as standby source for drought emergency. Court Farm WTW is supplied by water abstracted from the River Wye at Monmouth and from the River Usk at Llantrisant. The Court Farm WTW delivers water south towards Newport and south easterly towards Chepstow. Currently Wentwood Reservoir is out of routine use but is retained for drought contingency purposes. Similarly the borehole at Rogerstone Grange has now been taken out of routine operation and the source will be retained for drought contingency purposes. With the introduction of the additional pumping station on the A48 at Crick, all of the area between Newport and Chepstow can be served from Court Farm WTW. The abstraction at Whitemill and the reservoirs at Pant yr Eos and Ynys y Fro have been out of operation for a number of years and their associated WTW have been de-commissioned. They will be retained as standby sources for drought emergency.

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Sudbrook pumping station takes a supply from the Severn Tunnel (Great Spring) at Sudbrook and supplies a single industrial customer with non-potable industrial water. For 2012/13 the average demand was 202.86 Ml/d and the peak week demand was 223.77 Ml/d. The Rivers Usk and Wye are both designated as a Special Area of Conservation (SAC) under the Habitats Regulations. Any changes to our authorised operation will have to reflect the sensitivities of this designation. Both rivers have been subject to the Review of Consents process undertaken by the then Environment Agency Wales (now Natural Resources Wales (NRW)) to meet their obligations under the EU Habitats Directive. The assessment considers the river flow requirements needed to support the designated species and the potential impact from our operations. The NRW have been unable to conclude ‘no adverse affect’ from our current operations and are proposing to modify our abstraction licences within the River Usk and Wye SACs. We are awaiting formal licence modifications so that we can assess the impact on our operations during a drought and will amend the Drought Plan accordingly.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, Use the water that you need but please don’t waste it levels. within operational rules and within General Water Efficiency Campaigns via: quality constraints Ongoing leakage maintenance and water efficiency work - Radio streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ and ‘Enhanced - Water Efficiency Web Page Leakage Management’ option. Developing Raise and increase awareness of the importance of water Commence increased liaison in line with Use what you need but please don’t waste water. Drought conservation measures through the established media Communications Plan. We increasingly need your help to conserve water supplies. campaigns as per the communication plan which will Review and implement where feasible include requests for voluntary restraint. We are also doing our bit by ensuring we fix leaks quickly to tankering to support lower resource prevent waste Undertake ‘Media Campaigns with Water Efficiency Device areas. Offering’ option (Saving of 0 – 5% of demand). Continuation of Normal Activities plus Enhanced targeted Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ option (Saving of 0.5 – 2% of the volume above policy minimum - Local Radio leakage (PML)). - Target social media Supply / demand situation continually monitored throughout the drought situation and the effectiveness of - Prepare and Publish DCWW Drought Web Page demand-side measures. TUB consultation via Printed media Continuation of preceding options. Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new demand- Within WRZ support for vulnerable We’ve introduced a temporary hosepipe ban as a last resort to side measures to be included in media campaign and as sources. help conserve water supplies aligned with the communication plan.) Implement environmental monitoring in Ask you to respect this to ensure supplies to people in the area Introduction of TUBs (Saving of 0 – 5% demand). line with Monitoring Plan. are conserved Continuation of preceding options. Review current operational activities to Thank you in advance for your cooperation preserve resource. Preplanning for the implementation of NEUBs. Implement TUBS

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Continue to review and implement Continuation of Previous Techniques plus Enhanced messaging via: where feasible tankering to support - Local Radio lower resource and/or from neighbouring zone. - Targeted social Media Prepare Drought Order/ Permit - Plus Call Centre Pre recorded Messages applications. - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new demand- If the above demand restrictions are in Continuation of Previous Activities with the enhanced message Drought side measures to be included in media campaign and as operation, and zonal demand is still We appreciate your help so far in observing the temporary use aligned with the communication plan.) above 280 Ml/d for the potable water restrictions output4, or storage has declined into the Introduction of NEUBs (Saving of 0 – 5% demand). Severe Drought zone for the Big 5 Water levels are at very low levels so we ask you think carefully Continuation of preceding options. Drought Diagram, Welsh Water would about the waster you use seek Drought Order/ Permit solutions for supply side options 8109.D1 – D8 Urge you not to waste any water Implementation of NEUB Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 43 - Llwynon/ Sluvad/ Court Farm - Drought Action Sequence of Events

4 Assuming 160 Ml/d output from Sluvad, 110 Ml/d output from Court Farm, and Llwynon delivering an average of 11 Ml/d

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Supply side options

8109.D1 - Reduce compensation water releases from Llwynon Reservoir Reduce compensation water releases from Llwynon Option Name Reservoir Drought- Prepare Drought Order/ Permit applications Severe Drought- If demand restrictions are in operation, and Trigger(s) zonal demand is still above 280 Ml/d for the potable water (or preceding actions) output5, or storage has declined into the Severe Drought zone for the Big 5 Drought Diagram. Yield of action 9.1 Ml/d (Llwynon comp.). This would be a 50% reduction in Ml/day unless stated the normal compensation discharge of 18.2 Ml/d.

otherwise Location Area affected or whole supply Llwynon/ Sluvad/ Court Farm zone 2 Week application preparation time 14 days for NRW decision 1 week for implementation Implementation timetable This drought option could be implemented at any time Preparation time, time of during the year to maintain reservoir storage, and to year effective, duration improve reservoir winter refill, but is most likely to be implemented between mid-summer and mid-winter. The drought permit would be in place for up to 6 months.

Option Implementation Assessment Implementation Option Permissions required and constraints Including details of liaison Drought Permit - NRW carried out with bodies responsible for giving any permits or approvals

No operational risks. Only risk is non-granting of the Drought Risks associated with option Permit by NRW.

Risk to the Environment

(High/Medium/Low or Low unknown) Summary of likely An initial Environmental Assessment Report (EAR) has been

environmental impacts prepared for this drought option, however it is understood

Assessment Environmental Environmental Include details for features of that NRW have outstanding issues with the assessment moderate and major presented in the EAR, and the assessment has not been

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sensitivity and minor finalised. sensitivity features from The report concluded that the drought permit has the designated sites potential to impact on the downstream Afon Taf Fwar (moderate hydrological impact) and its continuation, the River Taff (minor hydrological impact to the confluence with Afon Cynon). The EAR predicted no significant effects on ecological receptors as a result of the operation of the drought permit. However, it is noted that brown trout, Atlantic salmon and lamprey species are present within the hydrological zone of influence of the drought permit, and further to comments received from NRW, impacts to fish and macroinvertebrates may require reconsideration and could be significant. No significant impacts of drought permit implementation on designated sites were identified in the EAR. The EAR utilised available information from surveys and investigations undertaken by DCWW and NRW. In addition, a Baseline information used programme of environmental monitoring was undertaken in 2010-13. The Environmental Monitoring Plan (EMP) sets out the monitoring that would be required if a drought permit is implemented, and is presented in the EAR. The EMP recommended baseline monitoring, and Summary of additional monitoring that should be undertaken during and after baseline monitoring implementation of a drought order for: requirements Reservoir levels, river flows, river cross section and wetted area, geomorphology, physico-chemical water quality, salmonids, bullhead, lamprey, macroinvertebrates, white clawed crayfish and macrophytes. Mitigation measures were identified in the EMP. These include: Changing the mix of water from the three off-takes at Llwynon, introduction of mixing apparatus into the reservoir, Mitigation measures freshets, release cooler water from the reservoir, capture and relocation of fish upstream of barriers, and if identified as required, fish rescue in consultation with NRW and/or restocking of fish.

The EAR identified no significant impacts on other activities Impact on other activities including recreational activities (angling, sailing and e.g. fisheries, industry etc canoeing) archeology and landscape and visual amenity.

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8109.D2 - Unsupported abstractions from the River Usk at Prioress Mill Unsupported abstractions from the River Usk at Prioress Option Name Mill Drought- Prepare Drought Order application. Severe Drought- If demand restrictions are in operation, and Trigger(s) zonal demand is still above 280 Ml/d for the potable water (or preceding actions) output6, or storage has declined into the Severe Drought zone for the Big 5 Drought Diagram. Yield of action Ml/day unless stated 25 Ml/d otherwise Location Additional resource at Llandegfedd reservoir for subsequent Area affected or whole supply use at Sluvad WTW. zone

2 week application preparation time Decision from WG within 28 days and practical Implementation timetable implementation could be effected within 1 week. Preparation time, time of year The option is most likely to be implemented during the late

Implementation Assessment Implementation effective, duration summer and autumn period, although it could be implemented at any time during the year. Drought orders are valid for up to 6 months. Option Option Permissions required and constraints Including details of liaison Drought Order - WG carried out with bodies responsible for giving any permits or approvals

Risks associated with option Non-granting of the Drought Order by WG.

Risk to the Environment (High/Medium/Low or High unknown) An Environmental Monitoring Plan (EMP) was prepared for Summary of likely

Assessment this drought order in 2007. The EMP does not constitute an environmental impacts Environmental Assessment Report (EAR) which would Include details for features of describe the potential impacts of drought order moderate and major implementation on sensitive features. However, the EMP sensitivity and minor does present a hydrological assessment which lists the likely sensitivity features from impacts of drought order implementation on the flow/level Environmental Environmental designated sites regime in the impacted waterbodies. In the absence of an

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EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought order implementation includes the River Usk from Trostry flow gauge to Llantrisant intake (minor hydrological impact) downstream of the Llantrisant intake to the tidal limit (majorhydrological impact). On a precautionary basis, significant effects of flow and level changes are anticipated for: macroinvertebrates, macrophytes and fish (including Atlantic salmon, shad species, eel, lamprey species, bullhead and brown/sea trout). The River Usk within the zone of hydrological influence of the drought order is designated as both an SAC and a SSSI. Drought order implementation has the potential to result in significant impacts on designated features of the River Usk SAC and SSSI particularly the fish species and aquatic flora for which the site is designated. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a Summary of additional drought order for river flows, geomorphology, physico- baseline monitoring chemical water quality, phytoplankton, salmonids, shad requirements species, bullhead, lamprey species, macroinvertebrates, white clawed crayfish, macrophytes and landscape character.

Mitigation measures were identified in the EMP. These include: Reestablishment of macrophyte communities in impacted reaches, gravel cleaning, installation of flow deflectors or Mitigation measures artificial channel narrowing, refuge creation, alteration in abstraction regime, habitat enhancements, Intake screening if required, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment. No significant impacts on archaeology and cultural heritage, Impact on other activities landscape and visual amenity and recreation are e.g. fisheries, industry etc anticipated. Impacts on angling may be significant.

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8109.D3 - Unsupported abstractions from the Riverv Wye at Monmouth

Option Name Unsupported abstractions from the River Wye at Monmouth

Drought- Prepare Drought Order application Severe Drought- If demand restrictions are in operation, and Trigger(s) zonal demand is still above 280 Ml/d for the potable water (or preceding actions) output7, or storage has declined into the Severe Drought zone for the Big 5 Drought Diagram. Yield of action 18 Ml/d (unsupported Wye) being the difference between the Ml/day unless stated daily licensed abstraction rate of 136 Ml/d and the reduced

otherwise abstraction rate under low river flow conditions. This option would allow the Wye transfer from Monmouth to Location meet the demands of both the potable capacity at Court Farm Area affected or whole (110 Ml/d) and the non-potable industrial requirement (circa supply zone 25 Ml/d). We assume a decision from WG within 28 days of submitting the Drought Order application. The practical implementation of the option could be effected Implementation timetable within 1 week. Preparation time, time of The drought order could potentially start in any month of the year effective, duration year although is most likely to begin in late summer (following drawdown of Elan Valley Reservoirs over a preceding dry

Option Implementation Assessment Implementation Option spring and summer). Drought orders are valid for up to 6 months. Permissions required and constraints Including details of liaison Drought Order - WG carried out with bodies responsible for giving any permits or approvals

Risks associated with Non-granting of Drought Order by WG. option

Risk to the Environment (High/Medium/Low or Medium-High unknown) Summary of likely An Environmental Assessment Report (EAR) was prepared for environmental impacts this drought option in 2012. The zone of hydrological Include details for features influence of drought order implementation includes the River of moderate and major Wye from the Wye transfer intake to the tidal limit (10.4km, sensitivity and minor minor hydrological impact). sensitivity features from The EAR concluded moderate adverse impacts of drought

Environmental Assessment Environmental designated sites order implementation on macrophytes, macroinvertebrate

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populations and juvenile salmonids and shad. The River Wye is designated as both an SAC and a SSSI. Drought order implementation has the potential to result in significant impacts on designated features of the River Wye SAC and SSSI, particularly the fish species and aquatic flora for which the site is designated. The EAR for this drought option was prepared in 2012 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The Environmental Monitoring Plan (EMP) sets out the monitoring that would be required if a drought order is implemented, and is presented in the EAR. Summary of additional The EMP recommended baseline monitoring, and monitoring baseline monitoring that should be undertaken during and after implementation of requirements a drought order for: River flows, physico-chemical water quality, macrophytes and macroinvertebrates. The EAR identified the following mitigation measures: Point source pollution management measures, physical intervention to re-oxygenate the channel, relocation or re- Mitigation measures colonisation, dependent on species; if necessary, fish rescue and / or habitat enhancement; and; re-stocking of fish species using offspring of broodstock from the catchment. The EAR identified minor adverse impacts on angling on the Impact on other activities River Wye between June and October and negligible impacts e.g. fisheries, industry etc to all other recreational activities, landscape and visual amenity and archaeology and cultural heritage.

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8109.D4 - Emergency abstraction from the Afon Lwyd at New Inn

Option Name Emergency abstraction from the Afon Lwyd at New Inn

Drought- Prepare Drought Permit applications Severe Drought- If demand restrictions are in operation, and Trigger(s) zonal demand is still above 280 Ml/d for the potable water (or preceding actions) output8, or storage has declined into the Severe Drought zone for the Big 5 Drought Diagram. Yield of action 12 Ml/d using Welsh Water licence limits in the Upper Lwyd Ml/day unless stated area, upstream of this location otherwise Location

Area affected or whole Abstraction would recharge Llandegfedd Reservoir supply zone 2 Week application preparation time We assume a decision from NRW within 14 days of submitting the Drought Permit application. Implementation timetable The practical implementation of the option could be effected Preparation time, time of within 4 weeks. year effective, duration The option is most likely to be implemented during the late summer and autumn period, although it could be implemented at any time during the year. Drought permits are valid for up to 6 months. Permissions required and

Option Implementation Assessment Implementation Option constraints Including details of liaison Drought Permit - NRW carried out with bodies responsible for giving any permits or approvals Non-granting of the drought permit or any of the other permissions required to enact this option. Availability of temporary infrastructure needed to implement Risks associated with the option. option Security of temporary infrastructure. Timescales – there is a risk this option could take longer than 4 weeks to implement due to unforseen engineering implications

Risk to the Environment

(High/Medium/Low or Medium unknown) Summary of likely An Environmental Assessment Report (EAR) was prepared for

Assessment environmental impacts this drought option in 2012. The zone of hydrological Environmental Environmental Include details for features influence of drought order implementation includes the Afon

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of moderate and major Lwyd from the temporary abstraction location to the tidal sensitivity and minor limit (12.25km, moderate hydrological impact). Local impacts sensitivity features from upstream of the weir are anticipated due to ponding. designated sites The EAR concluded moderate adverse impacts of drought permit implementation on macrophytes, macroinvertebrates, white clawed crayfish and salmon and sea/brown trout and lamprey species. These impacts relate to the moderate adverse hydrological impacts of the drought permit on flow and wetted width on the Afon Lwyd from New Inn to the tidal limit, and associated impacts on water quality. In addition, impacts are likely to be associated with the construction of the temporary weir, which would introduce a potential barrier to upstream fish migration. There are no statutory designated sites within the zone of hydrological influence of the drought permit. The Afon Lwyd is, however, a tributary of the River Usk, which is designated as both an SAC and a SSSI. The confluence of the Afon Lwyd with the River Usk SAC is at Caerleon. The River Usk SAC is designated for Rannunculion/Callitricho habitat and for Atlantic salmon, shad, lamprey species, bullhead and otter. The potential for impacts of drought permit implementation on the River Usk SAC was assessed the EAR, which concluded no likely significant effects on the SAC. The EAR prepared in 2012 and utilised available information Baseline information used from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought permit was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP Summary of additional recommended baseline monitoring, and monitoring that baseline monitoring should be undertaken during and after implementation of a requirements drought permit for: river flows, physico-chemical water quality, macrophytes, macroinvertebrates, white clawed crayfish and juvenile Atlantic salmon & sea/brown trout. Mitigation measures were identified in the EAR. These include: Temporary cessation of the drought permit conditions, limitation of abstraction, using measurement to restrict abstractions at lowest flows to ensure a minimum residual flow in the river, modify the design of the temporary weir such that it does not cause ponding of water, physical Mitigation measures intervention to re-oxygenate the channel local to the temporary weir or other weir pools, incorporation of fish passage facilities into the design of the temporary weir, the selection of a ‘fish-friendly’ screened pump, in-drought watching brief and if necessary, fish rescue and / or habitat enhancement, re-stocking of fish species using offspring of broodstock from the catchment, in-drought watching brief

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and if necessary, white-clawed crayfish rescue and relocation.

The EAR identified minor adverse impacts on landscape and visual amenity adjacent to the Afon Lwyd and minor adverse Impact on other activities impacts on archaeology and cultural heritage. Moderate e.g. fisheries, industry etc adverse impacts on angling are anticipated if the option is implemented in the period June to October (noting upstream migratory periods and fishing closed season).

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8109.D5 - Re-commissioning of Ynys y Fro WTW using Pant Yr Eos and Ynys y Fro Reservoirs Re-commissioning Ynys y Fro WTW using Pant yr Eos and Ynys Option Name y Fro reservoirs Severe Drought- If demand restrictions are in operation, and zonal demand is still above 280 Ml/d for the potable water Trigger(s) output9, or storage has declined into the Severe Drought zone (or preceding actions) for the Big 5 Drought Diagram. If agreed appropriate response to the current drought situation by Welsh Water Executive

Yield of action 10 Ml/d assuming full capacity of both reservoirs could be Ml/day unless stated used. otherwise Location Area affected or whole Ynys y Fro reservoir catchment supply zone Implementation timetable The practical implementation of the option would take at Preparation time, time of least 18 months to implement due to the likely treatement year effective, duration requirements.

Permissions required and DWI confirmation of acceptance of a source out of normal Implementation Assessment Implementation constraints usage for a number of years. Including details of liaison The Ynys y Fro reservoir has been used for recreational

Option carried out with bodies purposes for a long period. Proposals to bring it back into use responsible for giving any with the subsequent drawdown of water levels will need to permits or approvals be discussed with the various stakeholders. The feasibility of this option will depend on the availability of treatment facilities. In addition, due to roads and other urban obstacles the network configuration required would be Risks associated with option problematic. Timeframe: Depending on the drought situation it may not be possible to implement this option in the timeframes associated with the required drought response.

Risk to the Environment (High/Medium/Low or Low unknown) Summary of likely environmental impacts Production of additional water is unlikely to generate Include details for features environmental impacts beyond what is already authorised by of moderate and major existing Welsh Water licences. The production process will sensitivity and minor need to be reviewed to determine how the required quality sensitivity features from standards can be achieved.

Environmental Assessment Environmental designated sites

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Baseline information used N/A

Summary of additional baseline monitoring N/A requirements

Mitigation measures N/A

Impact on other activities N/A e.g. fisheries, industry etc

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8109.D6 - Use Grwyne Reservour, as a regulating reservoir, to support abstractions at Prioress Mill or Llantrisant Use Grwyne Reservoir, as a regulating reservoir, to support Option Name abstractions at Prioress Mill or Llantrisant

Drought- Prepare Drought Order application Severe Drought- If demand restrictions are in operation, and Trigger(s) zonal demand is still above 280 Ml/d for the potable water (or preceding actions) output10, or storage has declined into the Severe Drought zone for the Big 5 Drought Diagram. Yield of action Ml/day unless stated 40 Ml/d

otherwise The releases would be used to support abstraction at either Location Prioress Mill or the Llantrisant intake on the River Usk, Area affected or whole supply which then transfers water to Llandegfedd Reservoir. The zone release volume would be abstracted on a put-and-take basis. 2 Week application preparation time

We assume a decision from WG within 28 days of Implementation timetable submitting the Drought Order application. Preparation time, time of year The practical implementation of the option could be effective, duration effected within 1 week.

Option Implementation Assessment Implementation Option The option is most likely to be implemented during the summer and autumn period. Drought orders are valid for up to 6 months. Permissions required and constraints Including details of liaison Drought Order - WG carried out with bodies responsible for giving any permits or approvals

Risks associated with option Non-granting of the Drought Order by WG.

Risk to the Environment

(High/Medium/Low or High

unknown) Summary of likely An Environmental Monitoring Plan (EMP) was prepared for environmental impacts this drought order in 2007. The EMP does not constitute an

Include details for features of Environmental Assessment Report (EAR) which would Assessment Environmental Environmental moderate and major describe the potential impacts of drought order sensitivity and minor implementation on sensitive features. However, the EMP

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sensitivity features from does present a hydrological assessment which lists the likely designated sites impacts of drought order implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. Drought order implementation includes the Afon Grwyne Fawr (flow increase, major hydrological impact) and the Afon Grwyne (flow increase, major hydrological impact). The operation of the drought order would be to replicate high winter flows in low summer flow conditions, for a continuous period, which is anticipated to result in significant adverse impacts on sensitive features. Significant effects are anticipated from the operation of the drought order on macroinvertebrates (including white- clawed crayfish, if present), macrophyte and fish species. The River Usk is designated as both an SAC and SSSI. Drought order implementation has the potential to result in significant impacts on designated features of the River Usk SAC and SSSI particularly the fish species and aquatic flora for which the site is designated. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that Summary of additional should be undertaken during and after implementation of a baseline monitoring drought permit for: reservoir outflow; river flows, river cross requirements -section and wetted width, geomorphology, physico- chemical water quality, phytoplankton, salmonids, allis and twaite shad, bullhead, lamprey species, macroinvertebrates, white clawed crayfish and macrophytes. Mitigation measures were identified in the EMP. These include: Reestablishment of macrophyte communities in impacted Mitigation measures reaches, phasing in of increases in compensation release, alteration in flow regime to prevent diurnal fluctuations in flow, intake screening if required, restocking of coarse fish. No significant effects to landscape and visual amenity, Impact on other activities recreation and archaeology and cultural heritage are e.g. fisheries, industry etc anticipated. Impacts on angling may be significant.

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8109.D7 - Utilise Grwyne Reservoir for direct supply

Option Name Utilise Grwyne Reservoir for direct supply

Severe Drought- If demand restrictions are in Trigger(s) operation, and zonal demand is still above 280 Ml/d for (or preceding actions) the potable water output11, or storage has declined into the Severe Drought zone for the Big 5 Drought Diagram. Yield of action 10 Ml/d Ml/day unless stated otherwise Location Cwmtillery supply area Area affected or whole supply zone Implementation timetable The practical implementation of the option could be Preparation time, time of year effected within 4 weeks. effective, duration Permissions required and

Option Implementation Assessment Implementation Option constraints As Welsh Water already holds the abstraction licence Including details of liaison carried for this resource, no further reference to NRW or WG is out with bodies responsible for required. giving any permits or approvals Careful selection of the point of entry into the Risks associated with option distribution system would be required. Risk to the Environment Low (High/Medium/Low or unknown) Summary of likely environmental

impacts

Include details for features of No designated sites identified moderate and major sensitivity and minor sensitivity features from designated sites

Baseline information used

Summary of additional baseline

monitoring requirements Environmental Assessment Environmental Mitigation measures

Impact on other activities

e.g. fisheries, industry etc

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8109.D8 - Reduce the compensation water releases from the Elan Reservoirs Reduce the compensation water releases from the Elan Option Name Reservoirs Drought- Prepare Drought Order application Severe Drought- If demand restrictions are in operation, and Trigger(s) zonal demand is still above 280 Ml/d for the potable water (or preceding actions) output12, or storage has declined into the Severe Drought zone for the Big 5 Drought Diagram. Yield of action

Ml/day unless stated 23 Ml/d otherwise Location This will conserve the longevity of reservoir storage for direct Area affected or whole local supply in the Elan/ Builth Wells WRZ supply zone 1 week application preparation time We assume a decision from WG within 28 days of submitting of Implementation Drought Order application. timetable The practical implementation of the option could be effected Preparation time, time of within 1 week. year effective, duration This option could be implemented at any time of year. Drought orders are valid for up to 6 months.

Option Implementation Assessment Implementation Option Permissions required and constraints Including details of liaison Drought Order - WG carried out with bodies responsible for giving any permits or approvals

Risks associated with Non granting of Drought Order by WG. option

Risk to the Environment (High/Medium/Low or High unknown) An Environmental Monitoring Plan (EMP) was prepared for this Summary of likely drought order in 2007. The EMP does not constitute an environmental impacts Environmental Assessment Report (EAR) which would describe Include details for the potential impacts of drought order implementation on features of moderate and sensitive features. However, the EMP does present a major sensitivity and hydrological assessment which lists the likely impacts of drought minor sensitivity features order implementation on the flow/level regime in the impacted

Environmental Assessment Environmental from designated sites waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects

12 Assuming 160 Ml/d output from Sluvad, 110 Ml/d output from Court Farm, and Llwynon delivering an average of 11 Ml/d

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of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought order implementation includes the Afon Elan from Caban Coch outfall to the confluence with the River Wye (flow decrease, moderate hydrological impact if implemented in summer, major impact if implemented in winter) and the River Wye (minor impacts from Afon Elan confluence to River Irfon confluence). Resulting impacts of changes to the flow/level regime are anticipated to be significant for: macroinvertebrates (including freshwater pearl mussel and white clawed crayfish, if present), macrophytes and fish, although the magnitude of impact would depend on the time of the year the option was implemented. The River Wye is designated as both an SAC and SSSI. Drought order implementation has the potential to result in significant impacts on designated features of the River Wye SAC and SSSI particularly the fish species and aquatic flora for which the site is designated. An EMP was prepared for this drought option in 2007 and Baseline information utilised available information from surveys and investigations used undertaken by DCWW and NRW. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should Summary of additional be undertaken during and after implementation of a drought baseline monitoring order for: reservoir outflow; river flows, river cross -section and requirements wetted width, geomorphology, physico-chemical water quality, phytoplankton, salmonids, shad, bullhead, lamprey species, macroinvertebrates, white clawed crayfish and freshwater pearl mussel (if present) and macrophytes. Mitigation measures were identified in the EMP. These include: Reestablishment of macrophyte communities in impacted reaches, alteration in abstraction regime, physical modification to existing structures that could present barriers to fish migration, relocation of fish upstream of migratory barriers, Mitigation measures installation of flow deflectors to ensure gravel remains silt free, creation of alternative refuges in deeper water, and if identified as required, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment, removal of freshwater pearl mussels to hatchery. Impact on other No significant effects to landscape and visual amenity, recreation activities and archaeology and cultural heritage are anticipated. Impacts e.g. fisheries, industry etc on angling may be significant.

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SEWCUS – Pontsticill High Level - 8119

Location Plan 23 - Ponsticill High Level Water Reseource Zone

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Pontsticill High Level Water Resources No. Location Licence No. Type 1 Pontsticill Reservoir 21/57/21/0002 Impounding Reservoir 2 Neuadd Reservoir 21/57/21/0002 Impounding Reservoir 3 Rhymney Bridge Reservoir 21/57/11/0001 Impounding Reservoir 4 Shon Sheffrey Reservoir 20/56/65/0014 Impounding Reservoir 5 Upper & Lower Carno Reservoirs 20/56/64/0003 Impounding Reservoir 6 Blaen y Cwm Reservoir 20/56/33/0013 Impounding Reservoir Gravity Fed Spring, Pumped To 7 Ffynnon Gisfaen Spring 20/56/33/0004 Craig Ddu WTW 8 Nant Glaisfa L'gynidr 20/56/37/0002 Spring abstraction Table 44 - Pontsticill High Level Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A39. Drought actions for this WRZ are given in Table A38. Current Resource Status The area occupies the highest levels in the SEWCUS WRZ with many of the communities supplied being situated close to the A465 and the upper areas of the Valleys. Under normal operating conditions the output from the Pontsticill, Nant y Bwch and Carno WTW’s deliver water down the valleys under gravity and into the local areas. As most of the area is at such a high level, there is limited opportunity to introduce additional water from the lower lying areas because the pumping links are limited. Therefore, under developing drought conditions the resources in the area are managed specifically to sustain the High Level storages. The only effective transfer is from the Talybont area via the Llangynidr pumping station to Rassau service reservoir, which is limited to 5 Ml/d. As storage declines further it is preserved in the High Level impounding reservoirs by reducing the area supplied until the sources only supply the High Level area. Pontsticill Reservoir is the largest resource and ordinarily serves both the High Level and Low Level areas. Whilst the Pontsticill output to the Low Level area can be stopped, the High Level system is dependent on Pontsticill Reservoir to maintain supplies. Therefore, it is important to preserve Pontsticill Reservoir storage to sustain the High Level area.

For 2012/13 the average demand was 36.51 Ml/d with a peak week demand of 41.36 Ml/d.

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Drought Actions – Sequence of Events

Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within Use the water that you need but please don’t waste it levels. operational rules and within quality constraints General Water Efficiency Campaigns via: Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ and - Water Efficiency Web Page ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison in line with Use what you need but please don’t waste water. Drought water conservation measures through the established Communication Plan. We increasingly need your help to conserve water media campaigns as per the communication plan Within the High Level area, the smaller reservoirs at supplies. which will include requests for voluntary restraint. Shon Sheffrey and Rhymney Bridge deplete relatively We are also doing our bit by ensuring we fix leaks quickly Undertake ‘Media Campaigns with Water Efficiency rapidly so within-area demand is sustained by to prevent waste Device Offering’ option (Saving of 0 – 5% of demand). moving the output from Pontsticill WTW progressively eastwards along the Heads of The Continuation of Normal Activities plus Enhanced targeted Undertake ‘Enhanced Leakage Management’ option Valleys area. The spring flow at Shon Sheffrey would Water Efficiency Messaging via: (Saving of 0.5 – 2% of the volume above policy be used to meet the reservoir compensation water minimum leakage (PML)). requirements. - Local Radio Supply / demand situation continually monitored The transfer from Talybont to Rassau service - Target social media throughout the drought situation and the reservoir via Llangynidr pumping station will operate effectiveness of demand-side measures. - Prepare and Publish DCWW Drought Web Page at the maximum capacity of 5 Ml/d when the overall Continuation of preceding options. High Level area demand increases to 45 Ml/d. TUB consultation via Printed media Preplanning for the implementation of TUBs and Review and implement where feasible tankering to NEUBs. support lower resource and/ or from neighbouring WRZ. Review and implement where feasible tankering to support lower resource areas. Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last

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demand-side measures to be included in media resort to help conserve water supplies Implement environmental monitoring in line with campaign and as aligned with the communication Monitoring Plan. Ask you to respect this to ensure supplies to people in the plan.) area are conserved Review current operational activities to preserve Introduction of TUBs (Saving of 0 – 5% demand). resource. Thank you in advance for your cooperation Continuation of preceding options. Review and implement where feasible tankering to Implement TUBS Preplanning for the implementation of NEUBs. support lower resource and/ or from neighbouring Continuation of Previous Techniques plus Enhanced WRZ. messaging via: Prepare Drought Permit applications. - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new If the demand restrictions are in operation and Continuation of Previous Activities with the enhanced Drought demand-side measures to be included in media demand is still above 40 Ml/d, Drought Permit message campaign and as aligned with the communication solutions will be sought for supply side options We appreciate your help so far in observing the plan.) 8119.D1 & D2 temporary use restrictions Introduction of NEUBs (Saving of 0 – 5% demand). Water levels are at very low levels so we ask you think Continuation of preceding options. carefully about the waster you use Urge you not to waste any water Implementation of NEUB Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service

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Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 45 - Pontsticill High Level Area Drought Actions Sequence of Events

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Drought Management Options - Supply Side

8119.D1 - Compensation Water Reduction of 50% at Pontsticill Reservoir

Option Name Compensation Water Reduction of 50% at Pontsticill Reservoir

Drought- Prepare Drought Permit application Trigger(s) Severe Drought- If demand restrictions are in operation and (or preceding actions) demand is still above 40 Ml/d Drought Permit solutions will be sought for supply side options 1 to 6. Yield of action Ml/day unless stated 9.5 Ml/d otherwise Location

Area affected or whole Pontsticill supply zone 1 week application preparation time We assume a decision from NRW within 2 weeks of submitting the Drought Permit application.

on Assessment on The practical implementation of the option could be effected Implementation timetable within 1 week. Preparation time, time of This drought option could be implemented at any time during year effective, duration the year to maintain reservoir storage, and to improve reservoir winter refill, but is most likely to be implemented between mid-summer and mid-winter. The drought permit would be in place for up to 6 months.

Option Implementati Option Permissions required and constraints Including details of liaison Drought Permit - NRW carried out with bodies responsible for giving any permits or approvals

Non granting of Drought Permit by NRW. Risks associated with Issues at the treatment works that prevent full utilisation of option the additional resource.

Risk to the Environment

(High/Medium/Low or Low

unknown) Summary of likely An initial Environmental Assessment Report (EAR) has been

environmental impacts prepared for this drought option, however it is understood Assessment Include details for features that NRW have outstanding issues with the assessment Environmental Environmental of moderate and major presented in the EAR, and the assessment has not been sensitivity and minor finalised.

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sensitivity features from The EAR concluded that the drought permit has the potential designated sites to impact on the downstream Afon Taf Fechan (moderate hydrological impact) and its continuation, the River Taff (moderate hydrological impact from confluence with Afon Taf Fawr to the Afon Bargog and minor hydrological impact to the confluence with Afon Cynon). The EAR predicted no significant effects on ecological receptors as a result of the operation of the drought permit. However, it is noted that brown trout, Atlantic salmon and lamprey species are present within the zone of influence of the drought permit, and further to comments received from NRW, impacts to fish and macroinvertebrates may require reconsideration, and could be significant. No significant impacts of drought permit implementation on designated sites were identified in the EAR. The EAR utilised available information from surveys and investigations undertaken by DCWW and NRW. In addition, a Baseline information used programme of environmental monitoring was undertaken in 2012. The Environmental Monitoring Plan (EMP) sets out the monitoring that would be required if a drought permit is implemented, and is presented in the EAR. Summary of additional The EMP recommended baseline monitoring, and monitoring baseline monitoring that should be undertaken during and after implementation of requirements a drought order for: reservoir levels, river flows, river cross section and wetted area, geomorphology, physico-chemical water quality, phytoplankton, salmonids, bullhead, lamprey, macroinvertebrates, white clawed crayfish and macrophytes. Mitigation measures were identified in the EMP. These include: Changing the mix of water from the three off-takes at Llwynon, introduction of mixing apparatus into the reservoir, Mitigation measures freshets, release cooler water from the reservoir, capture and relocation of fish upstream of barriers, and if identified as required, fish rescue in consultation with NRW and/or restocking of fish. The EAR identified no significant impacts on other activities Impact on other activities including recreational activities (angling, sailing, canoeing), e.g. fisheries, industry etc archeology and landscape and visual amenity.

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8119.D2 - Compensation Water Reduction of 50% at Lower Carno Reservoir Compensation Water Reduction of 50% at Lower Carno Option Name Reservoir Drought- Prepare Drought Permit application Trigger(s) Severe Drought- If demand restrictions are in operation and (or preceding actions) demand is still above 40 Ml/d Drought Permit solutions will be sought for supply side options 1 to 6. Yield of action Ml/day unless stated 0.47 Ml/d otherwise Location

Area affected or whole Lower Carno Reservoir supply zone 1 week application preparation time We assume a decision from NRW within 2 weeks of submitting the Drought Permit application. Implementation timetable The practical implementation of the option could be effected Preparation time, time of within 1 week. year effective, duration The option is most likely to be implemented during the summer and autumn period. Drought permits are valid for up to 6 months. Permissions required and constraints

Option Implementation Assessment Implementation Option Including details of liaison Drought Permit - NRW carried out with bodies responsible for giving any permits or approvals

Non granting of Drought Permit by NRW Risks associated with option Issues at the treatment works that prevent full utilisation of the additional resource.

Risk to the Environment (High/Medium/Low or Low unknown) An Environmental Monitoring Plan (EMP) was prepared for Summary of likely this drought permit in 2007. The EMP does not constitute an environmental impacts Environmental Assessment Report (EAR) which would describe Include details for features the potential impacts of drought order implementation on of moderate and major sensitive features. However, the EMP does present a sensitivity and minor hydrological assessment which lists the likely impacts of sensitivity features from drought permit implementation on the flow/level regime in Environmental Assessment Environmental designated sites the impacted waterbodies. In the absence of an EAR,

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professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought permit implementation includes 13.9km of the Afon Ebwy, from Carno reservoir outfall to Ebbw Fach River confluence (minor hydrological impact). Resulting impacts of changes to the flow regime on ecological features including macrophytes, macroinvertebrates and fish are considered unlikely to be significant. No designated sites have been identified that have the potential to be impacted during drought permit implementation. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought permit was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that Summary of additional should be undertaken during and after implementation of a baseline monitoring drought permit for: reservoir level and outflow; river flows, requirements river cross -section and wetted width, geomorphology, physico-chemical water quality, brown trout, bullhead, brook lamprey, macroinvertebrates, white clawed crayfish and macrophytes. The EMP identified the following mitigation measures: Installation of flow deflectors or artificial channel narrowing, refuge creation, gradual phasing of reductions in Mitigation measures compensation flow, freshets, habitat enhancements, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment. No significant impacts on landscape and visual amenity, Impact on other activities recreation (including angling) and archaeology and cultural e.g. fisheries, industry etc heritage are anticipated.

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SEWCUS - Ponsticill Low Level - 8120

Location Plan 24 - Pontsticill Low Level Water Resource Zone

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Pontsticill Low Level Water Resources No. Location Licence No. Type 1 Pontsticill Reservoir 21/57/21/0002 Impounding Reservoir 2 Neuadd Reservoir 21/57/21/0002 Impounding Reservoir 3 Llwynon Reservoir 21/57/21/0001 Impounding Reservoir 4 Cantref Reservoir 21/57/21/0001 Impounding Reservoir 5 Beacons Reservoir 21/57/21/0001 Impounding Reservoir 6 Llansannor (Pwllwy) 21/58/21/0001 Groundwater Abstraction Table 46 - Pontsticill Low Level Abstraction Licences

The location of the WRZ is shown on Figure A40. Drought actions for this WRZ are given in Table A39. Current Resource Status The Pontsticill Low Level system, under normal operating conditions, is supported from the Pontsticill High Level and Llwynon/ Court Farm/ Sluvad areas and the Tywi Gower WRZ. Whilst the Pontsticill and Neuadd reservoirs supply this area under normal conditions, both these reservoirs are dedicated to the High Level system under drought conditions. Only the Cantref/ Beacons reservoirs in the Taf Fawr valley are dedicated to this area under drought conditions. Neither of these reservoirs has a compensation water requirement so all their available storage is used for potable supply. The import from the Tywi Gower WRZ into the south west of the Low Level system can be up to 10 Ml/d by utilising the temporary pump at Llantrisant. Transfers into the Pontsticill Low Level system are limited by three pumping stations, Cilfynydd pumping station, Memorial pumping station and Cefn Hirgoed pumping station. As with the majority of the SEWCUS WRZ the constraining factor in this area is the amount of water remaining in storage rather than abstractions exceeding the licence conditions. There are no drought supply side options for this area. The supply side solutions to sustain the transfers into this area are discussed in the sections for the neighbouring areas of Pontsticill High Level and Llwynon/ Court Farm/ Sluvad. For 2012/13 the average demand was 57.23 Ml/d with a peak week demand of 59.28 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand levels. Abstraction remains within licence, Use the water that you need but please don’t waste it within operational rules and within Ongoing leakage maintenance and water efficiency work General Water Efficiency Campaigns via: quality constraints streams. - Radio Preplanning for the implementation of ‘Media Campaign with - Education Centres Water Efficiency Device Offering’ and ‘Enhanced Leakage Management’ option. - Water Efficiency Web Page Developing Raise and increase awareness of the importance of water Commence increased liaison in line with Use what you need but please don’t waste water. Drought conservation measures through the established media Communication Plan. We increasingly need your help to conserve water supplies. campaigns as per the communication plan which will include As discussed for the High Level area, requests for voluntary restraint. We are also doing our bit by ensuring we fix leaks quickly to when storage in Pontsticill Reservoir prevent waste Undertake ‘Media Campaigns with Water Efficiency Device reduces, Pontsticill storage is reserved Offering’ option (Saving of 0 – 5% of demand). for the High Level. Cantref WTW would Continuation of Normal Activities plus Enhanced targeted then only supply the Pontsticill Low Level Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ option (Saving of area. Should demand in this area exceed 0.5 – 2% of the volume above policy minimum leakage (PML)). the Cantref WTW output, support would - Local Radio Supply / demand situation continually monitored throughout be provided via the Cilfynydd pumping - Target social media the drought situation and the effectiveness of demand-side station from the Llwynon/ Court Farm/ measures. Sluvad area. - Prepare and Publish DCWW Drought Web Page Continuation of preceding options. Review and implement where feasible TUB consultation via Printed media tankering to support lower resource Preplanning for the implementation of TUBs and NEUBs. areas.

Drought Increasing public awareness and content of new demand-side Review current operational activities to We’ve introduced a temporary hosepipe ban as a last resort to measures to be included in media campaign and as aligned preserve resource. help conserve water supplies with the communication plan.) Continue to review and implement Ask you to respect this to ensure supplies to people in the area Introduction of TUBs (Saving of 0 – 5% demand). where feasible tankering to support are conserved lower resource and/ or from Continuation of preceding options. Thank you in advance for your cooperation neighbouring zone. Preplanning for the implementation of NEUBs. Implement TUBS The transfer of water from Felindre WTW (Tywi Gower WRZ) will be Continuation of Previous Techniques plus Enhanced messaging

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maximised to 14 Ml/d. via: - Local Radio - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new demand-side There are no drought options to pursue. Continuation of Previous Activities with the enhanced message Drought measures to be included in media campaign and as aligned The Low Level area would pass a greater We appreciate your help so far in observing the temporary use with the communication plan.) burden onto the Llwynon/ Sluvad/ Court restrictions Farm area, which already supports the Introduction of NEUBs (Saving of 0 – 5% demand). Low Level through transfers. Water levels are at very low levels so we ask you think Continuation of preceding options. carefully about the waster you use Urge you not to waste any water Implementation of NEUB Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 47 - Pontsticill Low Level Drought Actions Sequence of Events

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SEWCUS – Rhondda - 8112

Location Plan 25 - Rhondda Water Resources Zone

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Rhondda Water Resources No. Location Licence No. Type

Castell Nos & Lluest Wen Impounding 1 21/57/24/0025 Reservoir Reservoir

Impounding 2 Llyn Fawr & Garreg Lwyd Streams 21/57/24/0001 Reservoir

3 Nant Ystrad Ffernol 21/57/24/0007 Stream Abstraction

4 Nant Selsig 21/57/24/0004 Stream Abstraction

5 Nant Cesig 21/57/24/0036 Stream Abstraction

6 Nant Cwmparc 21/57/24/0009 Stream Abstraction

Table 48- Rhondda Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A36. Drought actions for this Area are given in Table A35. Current Resource Status The Rhondda part of South Wales is notable for its deep, steep sided valleys. Most of our network systems tend to follow the valley configurations with little opportunity for connections between the valleys.

The Rhondda Area is divided into two main systems:

one located in the valley of the Rhondda Fawr one located in the valley of the Rhondda Fach The primary connection between the two systems is into the Rhondda Link Main at the southern end of the valleys. The Link Main is supported from the rest of the SEWCUS system, particularly via the Llwynon/ Sluvad/ Court Farm system under drought conditions but more usually from the Pontsticill Low Level system.

The system in the headwaters of the Rhondda Fawr uses the Llyn Fawr reservoir and supporting supplies from the Garreg Lwyd Stream sources. These feed an onsite raw water storage reservoir at Tyn y Waun WTW on the outskirts of Treherbert. The raw water storage reservoir also receives the stream supplies from the Nant Ystrad Ffernol and the Nant Selsig. The operating rule curves for these sources maximises the use of the Ffernol and Selsig and seeks to preserve the Llyn Fawr storage. Tyn y Waun WTW supplies the upper part of the Rhondda Fawr valley and any excess water gravitates into the lower part of the valley.

Following the dry summer of 2010, a new infrastructure link main has been laid between Penderyn reservoir, within the Cynon system and Llyn Fawr reservoir. Utilisation of Penderyn reservoir, supported if necessary by Penderyn borehole, will enable further support to maintaining reservoir storage within Llyn Fawr. This will supply up to 1 Ml/d when required.

As identified in the 2000 Drought Plan, the works at Llwynypia have been decommissioned and the sources at the Nant Cesig and Nant Cwmparc are no longer taken into supply; however, they are retained as standby sources for drought emergency. The lower part of the Rhondda Fawr is supplied from the Rhondda Link main from the Pontsticill Low Level system. It is likely that these sources would be used to support tankering to Nearby Tyn y Waun or Maerdy WTWs.

On the Rhondda Fach there are two reservoirs at Castell Nos and Lluest Wen that supply Maerdy WTW. Again, support is provided from the Rhondda Link to the lower part of the Rhondda Fach area through the

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Porth Tanks, which enables the demand in this area to be shared. The hydraulic capacity of the Link to deliver water into this area is constrained to 8 Ml/d. The minimum output from Maerdy WTW, as defined by the operating rule curve, is 7 Ml/d.

Neither of the reservoir systems in the Rhondda carries a statutory compensation requirement and all water captured by both systems is considered to be fully utilised for potable supply. For drought management purposes the systems in this area are constrained by the resource availability.

For 2012/13 the average demand was 21.16 Ml/d and the peak week demand was 26.04 Ml/d

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Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ option (Saving of 0.5 – 2% of the volume above policy minimum leakage - Local Radio (PML)). - Target social media Supply / demand situation continually monitored throughout the drought situation and the effectiveness of demand-side - Prepare and Publish DCWW Drought Web Page measures. TUB consultation via Printed media Continuation of preceding options. Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new demand-side Within WRZ support for vulnerable We’ve introduced a temporary hosepipe ban as a last resort to help measures to be included in media campaign and as aligned sources. conserve water supplies with the communication plan.) Implement environmental monitoring Ask you to respect this to ensure supplies to people in the area are Introduction of TUBs (Saving of 0 – 5% demand). in line with Monitoring Plan. conserved Continuation of preceding options. Review current operational activities Thank you in advance for your cooperation to preserve resource. Preplanning for the implementation of NEUBs. Implement TUBS Continue to review and implement

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where feasible tankering to support Continuation of Previous Techniques plus Enhanced messaging via: lower resource and/ or from - Local Radio neighbouring zone. - Targeted social Media Prepare Drought Permit application. - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new demand-side If all the above demand restrictions Continuation of Previous Activities with the enhanced message Drought measures to be included in media campaign and as aligned are in operation and storage on the We appreciate your help so far in observing the temporary use with the communication plan.) Big 5 Drought Diagram declines into restrictions the Severe Drought area, a Drought Introduction of NEUBs (Saving of 0 – 5% demand). Permit solution will be sought for Water levels are at very low levels so we ask you think carefully Continuation of preceding options. supply side option 8112.D1 about the waster you use Urge you not to waste any water Implementation of NEUB Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Letter Drop and or Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 49 - Rhondda Drought Actions Sequence of Events

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Drought Management Options - Supply Side

8112.D1 - Emergency Abstraction from the River Rhondda at Treherbert Emergency Abstraction from the River Rhondda at Option Name Treherbert Drought- Prepare Drought Permit application Trigger(s) Severe Drought- If demand restrictions are in (or preceding actions) operation and storage on the Big 5 Drought Diagram declines into the Severe Drought area. Yield of action 1 Ml/d Ml/day unless stated otherwise Temporary pipeline and mobile pumping equipment

Location would need to be installed to lift abstracted water to Area affected or whole supply zone Tyn y Waun WTW raw water reservoir and construction of a temporary weir. 1 week application preparation time. We assume a decision from NRW within 14 days of submitting the Drought Permit application. Implementation timetable The practical implementation of the option could be Preparation time, time of year effected within 4 weeks. effective, duration The option is most likely to be implemented during the summer and autumn period. Drought permits are valid for up to 6 months. Permissions required and constraints

Option Implementation Assessment Implementation Option Including details of liaison carried out Drought Permit - NRW with bodies responsible for giving any permits or approvals Non granting of Drought Permit by NRW. Availability of temporary infrastructure. Security concerns over temporary infrastructure. Issues at the treatment works that prevent full Risks associated with option utilisation of the additional resource. Timeframe: Due to unforeseen engineering implications it may require longer than 4 weeks to implement this option.

Risk to the Environment Medium (High/Medium/Low or unknown) An Environmental Monitoring Plan (EMP) was Summary of likely environmental prepared for this drought permit in 2007. The EMP impacts does not constitute an Environmental Assessment Include details for features of Report (EAR) which would describe the potential moderate and major sensitivity and impacts of drought permit implementation on minor sensitivity features from sensitive features. However, the EMP does present a designated sites hydrological assessment which lists the likely impacts Environmental Assessment Environmental of drought permit implementation on the flow/level

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regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought permit implementation includes the Afon Rhondda Fawr from the new intake at Treherbet to the confluence with the Afon Rhondda Fach (15.6m, moderate hydrological impact), and upstream of the intake (minor effects due to ponding). Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates, macrophytes (including white-clawed crayfish, if present) and fish (including brown/sea trout, Atlantic salmon, eel, lamprey species, coarse fish and shad species (if present)) are anticipated to be significant. In addition, impacts are likely to be associated with the construction of the temporary weir, which would introduce a potential barrier to upstream fish migration. No designated sites have been identified that have the potential to be impacted during drought permit implementation. An EMP was prepared for this drought option in 2007 and utilised available information from surveys Baseline information used and investigations undertaken by DCWW and NRW. A programme of hydrology monitoring was undertaken in 2011-12. The EMP for this drought permit was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be Summary of additional baseline undertaken during and after implementation of a monitoring requirements drought permit for: river flows, river cross section and wetted area, geomorphology, physico-chemical water quality, salmonids, shad species, bullhead, lamprey species, macroinvertebrates, white clawed crayfish (if present) and macrophytes. Mitigation measures were identified in the EMP. These include: Installation of flow deflectors or artificial channel narrowing, refuge creation, habitat enhancements, Mitigation measures incorporation of fish passage facilities into the design of the temporary weir, the selection of a ‘fish- friendly’ screened pump, and if required, fish rescue in consultation with NRW and/or restocking using

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offspring of broodstock from the catchment.

There is the potential for impacts on landscape and visual amenity and recreation (including angling) as a result of the presence of the temporary weir and Impact on other activities changes to the flow/level regime. However, the e.g. fisheries, industry etc significance of these impacts is currently unknown. No impacts on archaeology and cultural heritage are anticipated.

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SEWCUS – Talybont - 8116

Location Plan 26 - Talybont Water Resource Zone

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Talybont Water Resources No. Location Licence No. Type 1 Talybont Reservoir 20/56/41/0007 Impounding Reservoir 2 Grwyne Reservoir 20/56/34/0018 Impounding Reservoir 3 Cwmtillery Reservoir 20/56/63/0011 Impounding Reservoir 4 Cwmavon Reservoir 20/56/12/0046 Impounding Reservoir Stream abstraction to assist 5 Nant Clydach 21/57/25/0002 Talybont Reservoir refill Table 50 - Talybont Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A37. Drought actions for this Area are given in Table A36. Current Resource Status The area has been subject to a number of changes since the 2000 Drought Plan. Two of the adjacent small areas – Upper Lwyd and Grwyne/ Cwmtillery – were recognised to be heavily reliant on Talybont Reservoir under normal operating conditions. On this basis these two former areas have been amalgamated into the Talybont supply area. In addition a new main from Sluvad WTW to Pontypool break pressure tank has been constructed. This allows Sluvad water to meet around 10 Ml/d of demand normally placed upon the Talybont system, preserving Talybont reservoir storage during dry events and enabling effective balancing between Talybont and other SEWCUS reservoirs. If emergency use is to be made of the Afon Lwyd a mobile treatment plant would be required, or, a better solution would be for an abstraction to be made in the vicinity of the A465 roundabout at New Inn for treatment at Sluvad WTW (see the Llwynon/ Sluvad/ Court Farm section). As with most other areas in the SEWCUS WRZ this area is sensitive to the availability of reservoir storage and there are no concerns for exceeding the abstraction licence quantities. Grwyne WTW has been retained as a standby source for drought emergency. As discussed in the Llwynon/ Sluvad/ Court Farm section, there is the opportunity to use Grwyne Fawr Reservoir storage for additional regulation of the River Usk and the consequent abstraction at Prioress Mill to support Llandegfedd storage. However, the most likely option would be to re-instate Grwyne Fawr as a direct supply reservoir. For 2012/13 the average demand was 31.58 Ml/d and the Peak Week demand was 36.20 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand levels. Abstraction remains within licence, within Use the water that you need but please don’t waste it operational rules and within quality Ongoing leakage maintenance and water efficiency work General Water Efficiency Campaigns via: constraints streams. - Radio Preplanning for the implementation of ‘Media Campaign with - Education Centres Water Efficiency Device Offering’ and ‘Enhanced Leakage Management’ option. - Water Efficiency Web Page Developing Raise and increase awareness of the importance of water Commence increased liaison in line with Use what you need but please don’t waste water. Drought conservation measures through the established media Communication Plan. We increasingly need your help to conserve water supplies. campaigns as per the communication plan which will include Review and implement where feasible requests for voluntary restraint. We are also doing our bit by ensuring we fix leaks quickly to tankering to support lower resource areas. prevent waste Undertake ‘Media Campaigns with Water Efficiency Device Offering’ option (Saving of 0 – 5% of demand). Continuation of Normal Activities plus Enhanced targeted Water Efficiency Messaging via: Undertake ‘Enhanced Leakage Management’ option (Saving of 0.5 – 2% of the volume above policy minimum leakage (PML)). - Local Radio Supply / demand situation continually monitored throughout - Target social media the drought situation and the effectiveness of demand-side measures. - Prepare and Publish DCWW Drought Web Page Continuation of preceding options. TUB consultation via Printed media Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new demand-side Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last resort measures to be included in media campaign and as aligned to help conserve water supplies Implement environmental monitoring in line with the communication plan.) with Monitoring Plan. Ask you to respect this to ensure supplies to people in the Introduction of TUBs (Saving of 0 – 5% demand). area are conserved Review current operational activities to Continuation of preceding options. preserve resource. Thank you in advance for your cooperation Preplanning for the implementation of NEUBs. Continue to review and implement where Implement TUBS feasible tankering to support lower resource Continuation of Previous Techniques plus Enhanced and/or from neighbouring zone.

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messaging via: Talybont Reservoir compensation release conditions are already configured to allow a - Local Radio 50% reduction in the discharge volume when - Targeted social Media the Big 5 storage is below the Drought line. This is already endorsed within the - Plus Call Centre Pre recorded Messages abstraction licence and so is achieved without the need to secure a Drought Order. - Targeted messaging through texting service Prepare Drought Order/ Permit applications. Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Increasing public awareness and content of new demand-side If all the demand restrictions are in operation Continuation of Previous Activities with the enhanced Drought measures to be included in media campaign and as aligned and demand is still above 35 Ml/d and the message with the communication plan.) Big 5 storage has declined into the Severe We appreciate your help so far in observing the temporary Drought area of the Drought Diagram, Introduction of NEUBs (Saving of 0 – 5% demand). use restrictions Drought Order/ Permit solutions will be Continuation of preceding options. sought for supply side options 8116.D1 - D3. Water levels are at very low levels so we ask you think carefully about the waster you use Urge you not to waste any water Implementation of NEUB Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 51 - Talybont Drought Action Sequence of Events

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Drought Management Options - Supply Side

8116.D1 - Further reduction in Talybont Compensation Water release and reduction in Nant Clydach residual flow Further reduction in Talybont Compensation Water release Option Name and reduction in Nant Clydach residual flow Drought- Prepare Drought Order applications.

Trigger(s) Severe Drought- If demand restrictions are in operation and (or preceding actions) demand is still above 35 Ml/d and the Big 5 storage has declined into the Severe Drought area of the Drought Diagram. Yield of action Ml/day unless stated 3.4 Ml/d

otherwise Location Additional resource available for treatment at Talybont Area affected or whole WTW. supply zone 1 week application preparation time

We assume a decision from WG within 28 days of Implementation timetable submitting the Drought Order application. Preparation time, time of The practical implementation of the option could be year effective, duration effected within 1 week. This drought option could be implemented at any time of the year.

Option Implementation Assessment Implementation Option The drought order would be in place for up to 6 months. Permissions required and constraints Including details of liaison Drought Order – WG carried out with bodies responsible for giving any permits or approvals

Non granting of Drought Order by WG. Risks associated with option Issues at the treatment works that prevent full utilisation of the additional resource.

Risk to the Environment

(High/Medium/Low or High unknown) Summary of likely An Environmental Monitoring Plan (EMP) was prepared for

environmental impacts this drought order in 2007. The EMP does not constitute an Assessment

Environmental Environmental Include details for features Environmental Assessment Report (EAR) which would of moderate and major describe the potential impacts of drought order

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sensitivity and minor implementation on sensitive features. However, the EMP sensitivity features from does present a hydrological assessment which lists the likely designated sites impacts of drought order implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought order implementation includes the Nant Caerfanell (from Talybont Reservoir to the confluence with the River Usk) and Nant Clydach (moderate to major hydrological impact, depending on the timing of implementation). Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including white-clawed crayfish, if present), macrophytes and fish species (including lamprey species, Atlantic salmon, shad (if present), bullhead, brown/sea trout and eel are anticipated to be significant. The River Usk is designated as both an SAC and SSSI. Drought order implementation has the potential to result in significant impacts on designated features of the River Usk SAC and SSSI particularly the fish species and aquatic flora for which the site is designated. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought order was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that Summary of additional should be undertaken during and after implementation of a baseline monitoring drought order for: reservoir levels, river flows, river cross requirements section and wetted area, geomorphology, physico-chemical water quality, phytoplankton, salmonids, bullhead, lamprey, macroinvertebrates, white clawed crayfish (if present) and macrophytes. The EMP identified the following mitigation measures: Reestablishment of macrophyte communities in impacted reaches, physical modification to existing structures that could present as barriers to fish migration, gradual phasing of reductions in compensation flow, freshets relocation of Mitigation measures fish upstream of migratory barriers, installation of flow deflectors, artificial channel narrowing, gravel cleaning, creation of alternative refuges in deeper water, and if identified as required, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment.

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No significant effects to landscape and visual amenity, Impact on other activities recreation and archaeology and cultural heritage are e.g. fisheries, industry etc anticipated. Impacts on angling may be significant

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8116.D2 - Reduction in the Cwmtillery Reservoir Compensation Water Release Reduction in the Cwmtillery Reservoir Compensation Water Option Name release Drought- Prepare Drought Permit applications.

Severe Drought- If demand restrictions are in operation and Trigger(s) demand is still above 35 Ml/d and the Big 5 storage has (or preceding actions) declined into the Severe Drought area of the Drought Diagram.

Yield of action Ml/day unless stated 0.45 Ml/d otherwise Location Additional resource available for treatment at Cwmtillery Area affected or whole WTW. supply zone We assume a decision from NRW within 14 days of submitting the Drought Permit application. The practical implementation of the option could be effected Implementation timetable within 1 week. Preparation time, time of This drought option is most likely to be implemented in the year effective, duration summer and autumn period. The drought permit would be in place for up to 6 months.

Permissions required and constraints Including details of liaison Drought Permit - NRW carried out with bodies responsible for giving any permits or approvals

Non granting of Drought Permit by NRW. Risks associated with option Issues at the treatment works that prevent full utilisation of the additional resource.

Option Implementation Assessment Assessment Implementation Option

Risk to the Environment (High/Medium/Low or Low unknown) Summary of likely An Environmental Monitoring Plan (EMP) was prepared for environmental impacts this drought permit in 2007. The EMP does not constitute an Include details for features Environmental Assessment Report (EAR) which would of moderate and major describe the potential impacts of drought permit sensitivity and minor implementation on sensitive features. However, the EMP does sensitivity features from present a hydrological assessment which lists the likely

designated sites impacts of drought order implementation on the flow/level Environmental Assessment Assessment Environmental

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regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought permit implementation includes Tillery Brook (3.3km, minor hydrological impact) and Ebbw Fach River from the confluence with the Tillery Brook to the Afon Ebwy confluence (2.8km, minor hydrological impact). Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including white-clawed crayfish if present) macrophytes, fish (including brown trout, Atlantic salmon, eel and brook lamprey) are not anticipated to be significant. No designated sites have been identified that have the potential to be impacted during drought permit implementation. An EMP was prepared for this drought option in 2007 and Baseline information used utilised available information from surveys and investigations undertaken by DCWW and NRW. The EMP for this drought permit was agreed by DCWW and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that Summary of additional should be undertaken during and after implementation of a baseline monitoring drought permit for: reservoir levels, river flows, river cross requirements section and wetted area, physico-chemical water quality, salmonids, bullhead, lamprey, macroinvertebrates, white clawed crayfish (if present) and macrophytes. Mitigation measures were identified in the EMP. These include: Physical modification to existing structures that could present as barriers to fish migration, habitat enhancements, gradual phasing of reductions in compensation flow, freshets, Mitigation measures relocation of fish upstream of migratory barriers, installation of flow deflectors, artificial channel narrowing, gravel cleaning, creation of alternative refuges in deeper water, and if identified as required, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment. No significant effects to landscape and visual amenity, Impact on other activities recreation (including angling) and archaeology and cultural e.g. fisheries, industry etc heritage are anticipated.

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8116.D3 - Utilise the Dead Storage in Talybont Reservoir

Option Name Utilise the Dead Storage in Talybont Reservoir

Drought- Prepare Drought Order application.

Severe Drought- If demand restrictions are in operation Trigger(s) and demand is still above 35 Ml/d and the Big 5 storage (or preceding actions) has declined into the Severe Drought area of the Drought Diagram, Drought Order/ Permit solutions will be sought for supply side options 1000 Ml utilised over a period of 30 days would produce Yield of action an additional 30 Ml/d at the end of a severe drought Ml/day unless stated otherwise

period. Location Area affected or whole supply Talybont WTW

zone Assessment

1 week application preparation time We assume a decision from WG within 28days of Implementation timetable submitting the Drought Order application. Preparation time, time of year The practical implementation of the option could be effective, duration effected within 2 weeks. The drought order would be in place for up to 6 months. Permissions required and constraints

Option Implementation Option Including details of liaison Drought Order carried out with bodies responsible for giving any permits or approvals

Non-granting of Drought Order by WG Availability of required temporary infrastructure. Timeframe: It may not be possible to implement this Risks associated with option option within the 2 weeks due to unforeseen engineering implications. Issues at the treatment works that prevent full utilisation of the additional resource.

Risk to the Environment (High/Medium/Low or Unknown

unknown) Summary of likely Potential impact in that reservoir refill and spill will take environmental impacts longer as storage would start from a lower base position.

Include details for features of Potential for impacts on the River Usk SAC and SSSI.

Assessment Environmental Environmental moderate and major sensitivity Talybont Reservoir is designated as a SSSI and is of and minor sensitivity features importance for over-wintering wildfowl. Lake drawdown from designated sites may result in impacts on this SSSI.

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Baseline information used

Summary of additional baseline monitoring requirements

Mitigation measures

Impact on other activities

e.g. fisheries, industry etc

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Tywi Conjunctive Use System - 8201

Location Plan 27- Tywi CUS Water Resource Zone

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Tywi Conjunctive Use Water Resources No. Location Licence No. Type 1 Ystradfellte Reservoir 21/58/71/0001 Impounding Reservoir 2 Crai Reservoir 20/56/53/0002 Impounding Reservoir 3 Usk Reservoir 20/56/54/0001 Impounding Reservoir 4 Manorafon Intake 22/60/01/0068 Tywi – Regulated River Intake See Nantgaredig 5 Llyn Brianne Reservoir River Regulating Reservoir and Manorafon Impounding & Pump Storage 6 Upper & Lower Lliw Reservoirs 22/59/04/0065 Reservoir 7 Nantgaredig Intake 22/60/03/0035 Tywi - Regulated River Intake 8 Llygad Llwchwr 22/59/02/0050 River Intake 9 Upper & Lower Lliedi reservoirs 22/59/03/0023 Impounding Reservoirs 10 Parkmill 22/59/04/0048 Spring Intake 11 Schwyll Well 21/58/44/0006 Groundwater Source Table 52 - Tywi CUS Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A42. Drought Control Lines have been defined for Ystradfellte and Brianne Reservoirs, as shown in Figures A43 and A44 and drought actions are given in Table A40. Current Resource Status This is one of the largest WRZ’s and is managed as a conjunctive use system across the range of impounding reservoirs, regulated river intakes, small springs and boreholes. At present the Schwyll Well, Llygad Llwchwr river intake and Parkmill Springs sources have been taken out of routine operation and are retained as standby emergency sources. The upland reservoirs of Crai and Ystradfellte supply the upper parts of the Tawe and NeathValleys by gravity and pumped over into the Afan Valley. During periods of high reservoir storage and low demand the supply areas of these two reservoirs extend down the valley towards Swansea and Neath. As storage in the upland reservoirs declines, the area served is progressively reduced and water from Felindre WTW is moved progressively further up the valleys. The supply taken from Usk Reservoir delivers raw water to Bryn Gwyn WTW. As the storage in Usk Reservoir is also used for regulation of the River Usk (see SEWCUS WRZ) the quantity supplied to Bryn Gwyn is reduced and the shortfall is made up by an abstraction from the regulated River Tywi at Manoravon. At Nantgaredig, on the River Tywi, raw water is pumped to the Lliw Reservoirs and to Capel Dewi WTW. The Lliw Reservoirs supply Felindre WTW. When the Nantgaredig abstraction causes flows in the River Tywi to fall below 681.9 Ml/d (the licence hands-off-flow) the river is augmented by releases from Llyn Brianne Reservoir to match the abstraction rate. In addition to supporting the Ystradfellte and Crai Reservoirs supply areas, there is a transfer from Felindre WTW into the SEWCUS area via Cefn Hirgoed pumping station to serve the area north-west of Cardiff around Talbot Green and Radyr.

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The operation of Llyn Brianne Reservoir and the Tywi river regulation scheme is the subject of a Section 20 Operating agreement between Welsh Water and EAW. The Tywi is designated as a Special Area of Conservation (SAC) under the Habitats Directive. The River Tywi SAC has been subject to the Review of Consents process undertaken by the Environment Agency Wales to meet their obligations under the EU Habitats Directive. The assessment considers the river flow requirements needed to support the designated species and the potential impact from our operations. The EAW have so far been unable to conclude ‘no adverse affect’ from our current operations and we are awaiting the formal licence modifications. However, they have raised issues over the flow regime within the river, and also the potential of our intakes along the river to entrain fish. The operation of Llyn Brianne has also been raised as potentially adversely impacting upon the designated fish species within the River Tywi SAC. Once the formal licence modifications have been received, we will assess the impact on our operations during a drought and consider modifying the Drought Plan accordingly. For 2012/ 13 the average demand was 172.10 Ml/d with a peak week demand of 189.51 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and demand Abstraction remains within licence, within Use the water that you need but please don’t waste it levels. operational rules and within quality constraints General Water Efficiency Campaigns via: Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ - Water Efficiency Web Page and ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison with operational Use what you need but please don’t waste water. Drought water conservation measures through the colleagues and NRW in line with Management We increasingly need your help to conserve water supplies. established media campaigns as per the and Communications Plan. communication plan which will include requests for We are also doing our bit by ensuring we fix leaks quickly to When the Crai Reservoir summer storage falls, voluntary restraint. prevent waste the Crai supply area will be reduced. If the Progress ‘Media Campaigns with Water Efficiency stocks continue to fall the Ynysforgan pumps will Continuation of Normal Activities plus Enhanced targeted Water Device Offering’ option be brought into operation to reduce the Crai Efficiency Messaging via: supply area further by supplying water from Undertake ‘Enhanced Leakage Management’ option Felindre WTW into the parts of Swansea - Local Radio Supply / demand situation continually monitored normally fed from Crai. - Target social media throughout the drought situation and the When the Ystradfellte Reservoir storage effectiveness of demand-side measures. - Prepare and Publish DCWW Drought Web Page approach the Drought zone the Ystradfellte Continuation of preceding options. supply area is reduced by feeding water from TUB consultation via Printed media Felindre WTW to Cwm Afan and Upper Cwm Preplanning for the implementation of TUBs and Llynfi. NEUBs. Review and implement where feasible tankering to support lower resource and/or from neighbouring zone. Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last resort to demand-side measures to be included in media help conserve water supplies Implement environmental monitoring in line campaign and as aligned with the communication with Monitoring Plan. Ask you to respect this to ensure supplies to people in the area plan.) are conserved

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Introduction of TUBs (Saving of 0 – 5% demand, 0 – Review current operational activities to preserve Thank you in advance for your cooperation 8.39 Ml/d). resource. Implement TUBS Continuation of preceding options. Continue to review and implement where Continuation of Previous Techniques plus Enhanced messaging via: feasible tankering to support lower resource Preplanning for the implementation of NEUBs. and/or from neighbouring zone. - Local Radio Prepare Drought Order/ Permit applications. - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. If the above demand management measures are Continuation of Previous Activities with the enhanced message Drought in place and storage in Ystradfellte or Brianne Increasing public awareness and content of new We appreciate your help so far in observing the temporary use reservoirs moves into the Severe Drought zone demand-side measures to be included in media restrictions solutions will be sought for supply side options campaign and as aligned with the communication 8201.D1 - D6 Water levels are at very low levels so we ask you think carefully plan.) about the waster you use Introduction of NEUBs (Saving of 0 – 5% demand, 0 Urge you not to waste any water – 1.78 Ml/d). Implementation of NEUB Implementation of Emergency Drought Orders as Last Resort (Saving likely 0-10%, 0 – 16.79 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 53 - Tywi CUS Drought Actions Sequence of Events

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Drought Management Options – Supply Side

8201.D1 - Reduce Crai compensation flow by 50% Option Name Reduce Crai compensation flow by 50%

Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe drought- Introduction of supply side option Yield of action 3.4 Ml/d Ml/day unless stated otherwise Location The upland Crai reservoir supplies the Tawe Valleys and Area affected or whole supply parts of Swansea by gravity. As storage in the upland zone reservoir declines, the area served is progressively reduced and water from Felindre WTW is moved progressively further up the valley. Implementation timetable Total 6 weeks Preparation time, time of year 1 week application preparation effective, duration We assume a decision from WG within 4 weeks of submitting the Drought Order application. The practical implementation of the option could be effected within 1 week. The option is most likely to be implemented during the summer and autumn period.

Option Implementation Assessment Implementation Option Drought orders are valid for up to 6 months. Permissions required and Drought Order- WG constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Non-granting of Drought Order by WG. Reduced flow in the Afon Crai, a tributary of the River Usk. Risk to the Environment

(High/Medium/Low or unknown) High

Summary of likely An Environmental Monitoring Plan (EMP) was prepared environmental impacts for this drought order in 2007. The EMP does not Include details for features of constitute an Environmental Assessment Report (EAR) moderate and major sensitivity which would describe the potential impacts of drought and minor sensitivity features order implementation on sensitive features. However, from designated sites the EMP does present a hydrological assessment which lists the likely impacts of drought order implementation on the flow/level regime in the impacted waterbodies. In

Environmental Assessment Environmental the absence of an EAR, professional judgement has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological

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receptors. The zone of hydrological influence of drought order implementation includes Afon Crai to the confluence with the River Usk (major hydrological impact) and the River Usk from the Afon Crai confluence to the Afon Cilieni confluence (minor hydrological impact). Resulting impacts of changes to the flow regime on ecological features including macrophytes, macroinvertebrates and fish are likely to be significant. The Afon Crai in the zone of hydrological influence of the drought order is designated as part of the River Usk SAC and SSSI. Drought order implementation has the potential to result in significant impacts on designated features of the SAC and SSSI, particularly the fish species and aquatic flora for which the sites are designated. Baseline information used An EMP was prepared for this drought option in 2007.

Summary of additional baseline The EMP for this drought order was agreed by DCWW monitoring requirements and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: reservoir level and outflow, river flows and cross sections, geomorphology, physico-chemical water quality and phytoplankton, fish (including salmonids and lamprey species), macrophytes and macroinvertebrates (including white-clawed crayfish). Mitigation measures Mitigation measures were identified in the EMP. These include: Reestablishment of macrophyte communities in impacted reaches, artificial channel narrowing, habitat enhancement, phased changes in compensation flow regime, installation of flow deflectors, creation of refuges, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment. Impact on other activities No significant effects to landscape and visual amenity, e.g. fisheries, industry etc recreation and archaeology and cultural heritage are anticipated. Impacts on angling may be significant.

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8201.D2 - Reduce Ystradfellte compensation flow by 50% Option Name Reduce Ystradfellte compensation flow by 50%

Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe drought- Introduction of supply side option Yield of action 2.5 Ml/d Ml/day unless stated otherwise Location The upland Ystradfellte reservoir supplies the Neath Area affected or whole supply Valley by gravity and a pumped supply into the Afan zone Valley. As storage in the upland reservoirs declines, the area served is progressively reduced and water from Felindre WTW is moved progressively further up the Neath Valley and pumped into the Afan Valley Implementation timetable Total 4 weeks: Preparation time, time of year 1 week application preparation effective, duration We assume a decision from NRW within 14 days of

submitting the Drought Permit application.

The practical implementation of the option could be effected within 1 week. The option is most likely to be implemented during the summer and autumn period. Drought permits are valid for up to 6 months. Permissions required and Drought Permit - NRW constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Non-granting of Drought Permit by NRW

Reduced flow in the Afon Dringarth. Option Implementation Assessment Assessment Implementation Option Risk to the Environment Medium (High/Medium/Low or unknown) Summary of likely An Environmental Monitoring Plan (EMP) was prepared environmental impacts for this drought order in 2007. The EMP does not Include details for features of constitute an Environmental Assessment Report (EAR) moderate and major sensitivity which would describe the potential impacts of drought

and minor sensitivity features order implementation on sensitive features. However, from designated sites the EMP does present a hydrological assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought order

implementation includes the Afon Dringarth from the Environmental Assessment Assessment Environmental

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reservoir outflow to the confluence with the Afon Llia (major hydrological impact) and Afon Mellte from the confluence with the Afon Llia to the confluence with the Afon Hepte (moderate hydrological impact). Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including white-clawed crayfish if present), macrophytes and fish are likely to be significant. No designated sites have been identified that have the potential to be impacted during drought permit implementation. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought permit was agreed by DCWW monitoring requirements and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought permit for: reservoir level and outflow, river flows, river cross section and wetted area, geomorphology, physico-chemical water quality, salmonids, bullhead, macroinvertebrates, white clawed crayfish (if present) and macrophytes. Mitigation measures Mitigation measures were identified in the EMP. These include: Reestablishment of macrophyte communities in impacted reaches, artificial channel narrowing, habitat enhancement, phased changes in compensation flow regime, installation of flow deflectors, measures to reduce entrainment, creation of refuges, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment. Impact on other activities No significant effects to landscape and visual amenity, e.g. fisheries, industry etc recreation and archaeology and cultural heritage are anticipated. Impacts on angling may be significant.

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8201.D3 - Remove the maintained flow requirement below the Nantgaredig intake on the River Tywi Option Name Remove the maintained flow requirement below the Nantgaredig intake on the River Tywi Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe drought- Introduction of supply side option Yield of action 5 Ml/d Ml/day unless stated otherwise The flows below the intake would return to natural low flows. Ecology in the lower Tywi would however be

subjected to a lower flow than the 136.4 Ml/d Maintained Flow value. Location At Nantgaredig, on the River Tywi, raw water is pumped to Area affected or whole supply the Lower Lliw Reservoir and to Capel Dewi WTW. zone Implementation timetable Total 6 weeks: Preparation time, time of year 1 week application preparation effective, duration We assume a decision from WG within 28 days of submitting the Drought Order application. The practical implementation of the option could be effected within 1 week. The option is most likely to be implemented during the

Option Implementation Assessment Implementation Option summer and autumn period. Drought orders are valid for up to 6 months. Permissions required and Drought Order-WG constraints Releases made from Llyn Brianne would only be to a volume Including details of liaison carried to support the abstraction at the Nantgaredig and out with bodies responsible for Manorafon intakes. giving any permits or approvals Risks associated with option Non-granting of Drought Order by WG

Risk to the Environment (High/Medium/Low or unknown) High

Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared for impacts this drought order in 2007. The EMP does not constitute an Include details for features of Environmental Assessment Report (EAR) which would moderate and major sensitivity describe the potential impacts of drought order and minor sensitivity features implementation on sensitive features. However, the EMP from designated sites does present a hydrological assessment which lists the likely impacts of drought order implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the

Environmental Assessment Environmental likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought order implementation includes the Afon Tywi from Nantgaredig

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Intake to the tidal limit (major hydrological impact). The lower Afon Tywi is considered to be under hydrodynamic and hydro-ecological stress during the low flow conditions under which the drought order would be implemented. The drought order would further exacerbate the situation. Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including freshwater pearl mussel and white-clawed crayfish if present), macrophytes and fish (including shad, lamprey species, Atlantic salmon and sea/brown trout) are likely to be significant. The Afon Tywi is designated as both an SAC and SSSI. The changes to the flow and level regime as a result of drought order implementation are anticipated to result in significant impacts on designated features of the Afon Tywi SAC and SSSI. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought order was agreed by DCWW and monitoring requirements NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for: river flows and cross-sections, geomorphology, physico-chemical water quality, phytoplankton, salmonids, shad, bullhead, lamprey species, macroinvertebrates, freshwater pearl mussel, white clawed crayfish and macrophytes. Mitigation measures Mitigation measures were identified in the EMP. These include: Physical modification to existing structures that could present as barriers to fish migration, relocation of fish upstream of migratory barriers, installation of flow deflectors to ensure gravel remains silt free, alteration in abstraction regime, creation of alternative refuges in deeper water, intake screening if required, and if identified as required, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment, removal of freshwater pearl mussels to hatchery. Impact on other activities No significant effects to landscape and visual amenity, e.g. fisheries, industry etc recreation and archaeology and cultural heritage are anticipated. Impacts on angling may be significant.

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8201.D4 - Reduce Brianne compensation flow by 50% Option Name In the event that the drought becomes a prolonged multi-season event the issue could turn to ensure winter refill of Brianne to provide supplies for the following summer. To assist this the option is to reduce Brianne compensation flow by 50%. This would only be apparent when no regulation releases were necessary because of high natural flows in the lower Tywi.

Trigger(s) Drought- Prepare Drought Order

(or preceding actions) Severe drought- Introduction of supply side option Yield of action 4 Ml/d Ml/day unless stated otherwise Location Whole supply zone Area affected or whole supply zone Implementation timetable Total 6 weeks: Preparation time, time of year effective, 1 week application preparation duration We assume a decision from WG within 28 days of submitting the Drought Order application. The practical implementation of the option could

be effected within 1 week. Option Implementation Assessment Implementation Option The drought order would be in place for up to 6 months. Permissions required and constraints Drought Order- WG Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Non-granting of Drought Order by WG. Reduced flow in the Afon Tywi below Brianne reservoir. Risk to the Environment Unknown: The Generic Environmental Plan will be (High/Medium/Low or unknown) applied to this site, and a site specific

Environmental Monitoring Plan will be produced with a Drought Plan review. Summary of likely environmental Unknown; the HRA screening did not identify likely impacts significant effects on any European designated Include details for features of moderate sites. and major sensitivity and minor sensitivity features from designated sites

Baseline information used Environmental Assessment Environmental Summary of additional baseline monitoring requirements

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Mitigation measures

Impact on other activities e.g. fisheries, industry etc

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8201.D5 - Utilise the Upper and Lower Liedi reservoirs for potable supplies Option Name Utilise the Upper & Lower Lliedi reservoirs for potable supplies Trigger(s) Drought- Consider option (or preceding actions) Severe drought- Introduction of supply side option Yield of action 2 Ml/d Ml/day unless stated otherwise

Location Llanelli urban and rural areas Area affected or whole supply zone Implementation timetable The practical implementation of the option could be Preparation time, time of year effective, effected within 4 – 8 weeks. duration Permissions required and constraints This option has been determined during the draft Including details of liaison carried out drought plan process. Welsh Water holds the with bodies responsible for giving any licences for the reservoirs; therefore no further permits or approvals permissions would be required. At present, the Upper and Lower Lliedi Reservoirs are devoted to the industrial supply of water. In a drought, temporary treatment facilities could be Option Implementation Assessment Implementation Option mobilised to use some of the water for potable supplies. Risks associated with option Further investigation will need to take place in advance of the option to determine the potential treatment required. Timeframe: due to unforeseen engineering implications it may not be possible to implement this option within 8 weeks. Risk to the Environment Welsh Water still holds the abstraction licence to (High/Medium/Low or unknown) operate this source. There are not considered to be any additional environmental consequences of restarting the operation.

Summary of likely environmental The HRA screening did not identify likely significant impacts effects on any European designated sites. Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites Baseline information used

Summary of additional baseline

monitoring requirements Environmental Assessment Environmental Mitigation measures

Impact on other activities e.g. fisheries, industry etc

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8201.D6 - Reinstate Schwyll source and treatment works Option 6 may also be required in the second year of a drought if stocks have failed to recover.

Option Name Reinstate Schwyll source and treatment works

Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe drought- Introduction of supply side option if agreed an appropriate response to the drought situation by Welsh Water Executive. *Second year of a drought if stocks have failed to recover

Yield of action 22 Ml/d Ml/day unless stated otherwise Location Vale of Glamorgan , Bridgend, Llynfi, Ogmore, Area affected or whole supply zone GARW Vallies and into North West Cardiff Implementation timetable The practical implementation of the option would Preparation time, time of year effective, take between 18 and 24 months. duration Permissions required and constraints DWI approval to recommission a source that has Including details of liaison carried out been out of use for a considerable period of time. with bodies responsible for giving any

permits or approvals Risks associated with option Additional refurbishment and treatment will be required at the site, particularly sourcing an appropriate power source and building a bespoke treatment works to treat the required volume of water. Further investigation will need to take place in advance of the option to determine the potential treatment required. Timeframe: Depending on the drought situation it may not be possible to implement this option in the timeframe associated with the required

drought response. Option Implementation Assessment Assessment Implementation Option Risk to the Environment Welsh Water still holds the abstraction licence to (High/Medium/Low or unknown) operate this source. There are not considered to be any additional environmental consequences of restarting the operation.

Summary of likely environmental HRA Screening did not identify likely significant impacts effects on any European designated sites. Include details for features of moderate and major sensitivity and minor

sensitivity features from designated sites

Environmental Environmental Assessment

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Baseline information used

Summary of additional baseline monitoring requirements Mitigation measures

Impact on other activities e.g. fisheries, industry etc

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Ystradfellte Reservoir Drought Action Zones 100

90 NORMALOPERATION

DEVELOPING DROUGHT 70

60 DROUGHT

40 SEVERE DROUGHT Reservoir StorageReservoir (%)

20 EMERGENCY STORAGE

Figure 26 - Ystradfellte Reservoir Drought Action Zones

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Llyn Brianne Reservoir Drought Action Zones

100

NORMALOPERATION 80

70 DEVELOPING DROUGHT

60 DROUGHT

40 ReservoirStorage (%) SEVERE DROUGHT

EMERGENCY STORAGE 10

Figure 27 – Llyn Brianne Drought Action Zones

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Mid and South Ceredigion - 8202

Location Plan 28 - Mid and South Ceredigion Water Resource Zone

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Mid & South Ceredigion Water Resources No. Location Licence No. Type 1 River Teifi at Llechryd 22/62/03/0005 River Abstraction Teifi, Pondygwaith And Egnant 22/62/01/0057 & 2 Reservoir Sources Reservoirs 22/62/01/0087 3 Aeron Borehole Licence Exempt Groundwater Abstraction Table 54 - Mid and South Ceredigion Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A45. Drought Control Lines have been obtained for Teifi Pools Reservoir, as shown in Figure A46 and drought actions are given in Table A41. Current Resource Status The majority of the WRZ is supplied from two sources: Llechryd WTW, which is reliant on the run of river abstraction from the River Teifi, approximately 4 km above the tidal limit. Strata Florida WTW located near Pontrhydfendigaid in the upper Teifi catchment, which is supplied by three small reservoirs – Llyn Teifi, Llyn Egnant and Llyn Pondygwaith, which are collectively known as Teifi Pools. The Teifi Pools reservoirs have a combined compensation discharge of 0.79 Ml/d. Any potential gain in storage by reducing the compensation release, in the headwaters of a SAC river, is considered to be too small to be worth pursuing. Llechryd WTW is capable of sustaining an output of approximately 21 Ml/d. However, the constraint on this supply is the maximum daily licence quantity that is limited to 19 Ml/d. Strata Florida WTW was refurbished and extended in 2005 and is capable of treating up to 13 Ml/d. The existing resource capability and the licence constraints at Teifi Pools allow Strata Florida WTW to achieve an output of 13 Ml/d during relatively short peak periods. In addition there is a small localised groundwater sources at Aeron that is also able to provide a modest amount of water. In 20012/ 2013 the average demand was 17.38 Ml/d and the peak week demand was 19.53 Ml/d. Both the River Teifi itself and the Teifi Pools Reservoirs are designated as Special Areas of Conservation (SAC) under the Habitats Directive. The details of this designation are covered more extensively in the Environmental Monitoring Plan but this designation does have significant implications for the approval of any Drought Order powers. The River Teifi SAC has been subject to the Review of Consents process undertaken by the (then) Environment Agency Wales to meet their obligations under the EU Habitats Directive. The assessment considers the river flow requirements needed to support the designated species and the potential impact from our operations. The EAW have so far been unable to conclude ‘no adverse affect’ from our current operations and we are awaiting the formal licence modifications. However, they have raised issues over the potential of our intakes along the river to entrain fish. Once the formal licence modifications have been received, we will assess the impact on our operations during a drought and consider modifying the Drought Plan accordingly.

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Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last demand-side measures to be included in media resort to help conserve water supplies Implement environmental monitoring in line with Monitoring campaign and as aligned with the Plan. Ask you to respect this to ensure supplies to people in communication plan.) the area are conserved Review current operational activities to preserve resource. Introduction of TUBs (Saving of 0 – 5% demand, Thank you in advance for your cooperation 0 – 0.83 Ml/d). Continue to review and implement where feasible tankering to support lower resource and/or from neighbouring zone. Implement TUBS Continuation of preceding options. Aeron borehole, which is in the licence exempt groundwater Continuation of Previous Techniques plus Enhanced Preplanning for the implementation of NEUBs. area of West Wales and is currently not in use, could be messaging via: brought back into operation using portable treatment - Local Radio facilities. The borehole could potentially yield 1 Ml/d based on previous performance. - Targeted social Media Prepare Drought Order/ Permit applications. - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies

Severe Continuation of preceding options. Aeron and Olwen boreholes are resource constrained. It is Continuation of Previous Activities with the enhanced Drought likely that during a drought, the boreholes would either be message Increasing public awareness and content of new resource constrained or already depleted. It is not demand-side measures to be included in media We appreciate your help so far in observing the considered that any additional quantity would be available campaign and as aligned with the temporary use restrictions from these sources. communication plan.) Water levels are at very low levels so we ask you think Should the storage in Teifi Pools decline into the Severe Introduction of NEUBs (Saving of 0 – 5% demand, carefully about the waster you use Drought zone of the Drought Diagram, a Drought Order 0 – 0.25 Ml/d). solution would be sought for supply side options 8202.D1 & Urge you not to waste any water Implementation of Emergency Drought Orders as D2 Implementation of NEUB Last Resort (Saving likely 0-10%, 0 – 1.67 Ml/d)

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Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 55 - Mid and South Ceredigion Drought Actions Sequence of Events

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Drought Management Options – Supply Side

8202.D1 - Increase the Llechryd abstraction from 19 Ml/d to 21 Ml/d and obtain variation of annual licence amounts Option Name Increase the Llechryd abstraction from 19 Ml/d to 21 Ml/d and obtain variation of annual licence amounts. Trigger(s) Drought- Prepare Drought Order/ Drought Permit (or preceding actions) Should the storage in Teifi Pools decline into the Severe Drought zone of the Drought Diagram, a Drought Order solution would be sought for supply side options 1 Yield of action 1 to 2 Ml/d Ml/day unless stated otherwise Current treatment capacity of Llechryd WTW is ~21 Ml/d, with the low lift and the high lift intake capacities also at

~21 Ml/d, respectively. Location Coastal, Mid and South Ceredigion areas Area affected or whole supply To ensure that the Llechryd abstraction was operated zone within the current licence ceiling during the Drought Order application period, Welsh Water would mobilise an extensive tankering exercise from adjacent WRZ’s. Implementation timetable Total 6 weeks: Preparation time, time of year 1 week preparation of application effective, duration We assume a decision from WG within 28 days of submitting the Drought Order application. The practical implementation of the option could be effected within 1 week.

Option Implementation Assessment Implementation Option The option is most likely to be implemented during the summer period. Drought orders are valid for up to 6 months. Permissions required and Drought Order- WG constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Non-granting of Drought Order by WG. Reduced flow in the River Teifi under drought conditions

between Llechryd and the tidal limit.

Risk to the Environment Low (April to September) (High/Medium/Low or unknown) High (October to March) Summary of likely environmental An Environmental Assessment Report (EAR) has been impacts prepared for this drought option. Include details for features of The zone of hydrological influence of drought order moderate and major sensitivity implementation includes the Afon Teifi from the Llechryd and minor sensitivity features intake to the tidal limit (minor hydrological impact) The from designated sites EAR concluded minor adverse impacts of the drought

Environmental Assessment Environmental order on macrophytes, macroinvertebrates and fish

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species (Atlantic salmon and lamprey) except downstream migration of lamprey, for which the impact of the drought order was assessed as moderate adverse in the period October to March. This impact is due to entrainment of lamprey transformers during downstream migration. The Afon Teifi in the zone of hydrological influence of the drought order is designated as both an SAC and SSSI. It is noted that the Review of Consents identified the existing abstraction at Llechryd as impacting lamprey in the Afon Teifi. Operation of the drought order resulting in increased abstraction during lamprey transformer downstream migration would result in increased potential for entrainment of lamprey, resulting in adverse impacts. As the existing licence has been concluded as impacting the SAC, the drought order would potentially exacerbate the situation, unless suitable screening measures were implemented. Baseline information used The EAR prepared in 2012 utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The Environmental Monitoring Plan (EMP) sets out the monitoring requirements monitoring that would be required if a drought permit is implemented, and is presented in the EAR. The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for: river flows, physico-chemical water quality and lamprey species. Mitigation measures Mitigation measures were identified in the EAR. These include: Additional flow management measures, in-channel management measures, point source pollution management measures and direct ecological intervention measures to mitigate for water quality impacts. It is noted that fish screening measures to prevent the entrainment of lamprey are to be installed on the Welsh Water abstraction at Llechryd by 2015. Impact on other activities Minor adverse impacts on angling on the Afon Teifi e.g. fisheries, industry etc between June and October. Negligible impacts to all other recreational activities, landscape and visual amenity and archaeology and cultural heritage.

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8202.D2 - Increase the Teifi Pools annual abstraction licence to fully utilise the Emergency Storage volume Option Name Increase the Teifi Pools annual abstraction licence to fully utilise the Emergency Storage volume Trigger(s) Drought- Prepare Drought Order/ Drought Permit (or preceding actions) Should the storage in Teifi Pools decline into the Severe Drought zone of the Drought Diagram, a Drought Order solution would be sought for supply side options 2 Yield of action 1.5 Ml/d (for 30 days) Ml/day unless stated otherwise Location Mid Ceredigion Area affected or whole supply zone Implementation timetable Total 6 weeks: Preparation time, time of year 1 week preparation of application effective, duration We assume a decision from WG within 28 days of submitting the Drought Order application. The practical implementation of the option could be effected within 1 week. Drought orders are valid for up to 6 months. Permissions required and constraints Drought Order- WG Including details of liaison carried out Modelling has shown that the Emergency Storage

with bodies responsible for giving any requirement from Teifi Pools (284 Ml) could not be Option Implementation Assessment Implementation Option permits or approvals fully utilised, as in an exceptionally dry year the annual abstraction licence would have a shortfall of approximately 50 Ml. A Drought Order would be sought to increase the annual licence by this volume. Risks associated with option Modelling has shown that the Emergency Storage requirement from Teifi Pools (284 Ml) could not be fully utilised, as in an exceptionally dry year the annual abstraction licence would have a shortfall of approximately 50 Ml.

Risk to the Environment (High/Medium/Low or unknown) Summary of likely environmental impacts Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites

Baseline information used Environmental Assessment Environmental

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Summary of additional baseline monitoring requirements Mitigation measures

Impact on other activities e.g. fisheries, industry etc

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Figure 28 - Teifi Pools Drought Action Zones

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North Ceredigion - 8203

Location Plan 29 - North Ceredigion Water Resource Zone

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North Ceredigion Water Resources No. Location Licence No. Type 1 Llyn Craig Y Pistyll 23/64/12/0001 Reservoir Source 2 Nant Y Moch Stream 22/63/01/0027 Stream Abstraction 3 Maesnant Stream 22/63/01/0027 Stream Abstraction 4 Llyn Llygad Rheidol 22/63/01/0005 Reservoir Source 5 Lovesgrove Borehole 1 22/63/01/0029 Groundwater Abstraction 6 Lovesgrove Borehole 2 Licence Exempt Groundwater Abstraction Table 56 - North Ceredigion Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A47. Drought Control Lines have been defined for the combined storage of the North Cerdigion Reservoirs, as shown in Figure A48 and drought actions are given in Table A42. Current Resource Status The Craig y Pystyll and Llyn Llygad Rheidol reservoirs combined with the stream abstractions at Maesnant and Nant y Moch supply raw water to Bont Goch WTW. The works can maintain an output of 12 Ml/d that would require an input of 13 Ml/d of raw water. The live storage of Llyn Craig Y Pistyll is 356 Ml. Welsh Water is licensed to abstract 9.1Ml/d (1864 Ml/yr) with a compensation flow of 1.82 Ml/d to the Afon Leri. The live storage of Llyn Llygad Rheidol is 188 Ml. Welsh Water is licensed to abstract 5 Ml/d (929 Ml/yr). The abstractions from the Nant Y Moch and Maesnant streams are licensed for 6.8Ml/d and 1.4 Ml/d respectively. Borehole 1 at Lovesgrove is constrained by the abstraction licence quantity. Whilst Borehole 2 is currently in the groundwater licence exempt area of West Wales, changes to the licensing legislation following the Water Act 2003 mean that such an exemption will be terminated in the foreseeable future and the source will become licensed. Therefore, the major driver will be the performance of the abstraction licences of the storage reservoirs. For 2012/ 2013 the average demand was 8.43 Ml/d and the peak week demand was 9.25 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, within Use the water that you need but please don’t waste it demand levels. operational rules and within quality General Water Efficiency Campaigns via: constraints Ongoing leakage maintenance and water efficiency - Radio work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ - Water Efficiency Web Page and ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance of Commence increased liaison with Use what you need but please don’t waste water. Drought water conservation measures through the operational colleagues and NRW in line with We increasingly need your help to conserve water supplies. established media campaigns as per the Management and Communications Plan. communication plan which will include requests We are also doing our bit by ensuring we fix leaks quickly to Operationally if the combined storage of for voluntary restraint. prevent waste Craig-y-Pistyll and Llygad Rheidol falls into Progress ‘Media Campaigns with Water Efficiency the Developing Drought zone (Figure 52) Continuation of Normal Activities plus Enhanced targeted Water Device Offering’ option then maximum use is made of Lovesgrove 1 Efficiency Messaging via: borehole, the abstractions at Maesnant and Undertake ‘Enhanced Leakage Management’ Nantymoch are started to conserve storage - Local Radio option in Craig-y-Pistyll reservoir and preparations - Target social media Supply / demand situation continually monitored are undertaken to start using Lovesgrove 2. throughout the drought situation and the - Prepare and Publish DCWW Drought Web Page Review and implement where feasible effectiveness of demand-side measures. tankering to support lower resource and/or TUB consultation via Printed media Continuation of preceding options. from neighbouring zone. Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last resort to demand-side measures to be included in media help conserve water supplies Implement environmental monitoring in line campaign and as aligned with the communication with Monitoring Plan. Ask you to respect this to ensure supplies to people in the area are plan.) conserved Review current operational activities to Introduction of TUBs (Saving of 0 – 5% demand, 0 – preserve resource. Thank you in advance for your cooperation 0.40 Ml/d).

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Continuation of preceding options. Continue to review and implement where Implement TUBS feasible tankering to support lower resource Preplanning for the implementation of NEUBs. Continuation of Previous Techniques plus Enhanced messaging via: and/or from neighbouring zone. - Local Radio If the combined storage volume falls into the Drought zone of the Drought Diagram (Figure - Targeted social Media 52) then full use is made of Lovesgrove 2. - Plus Call Centre Pre recorded Messages Prepare Drought Order/ Permit applications. - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. If storage falls below the Severe Drought Continuation of Previous Activities with the enhanced message Drought Control Line then the next step would be to Increasing public awareness and content of new We appreciate your help so far in observing the temporary use seek a Drought Permit solution for supply demand-side measures to be included in media restrictions side options 8203.D1 - D3 campaign and as aligned with the communication Water levels are at very low levels so we ask you think carefully plan.) about the waster you use Introduction of NEUBs (Saving of 0 – 5% NHH Urge you not to waste any water demand, 0-0.12 Ml/d). Implementation of NEUB Implementation of Emergency Drought Orders as Last Resort (Saving likely 0-10%, 0 – 0.80 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 57 - North Ceredigion Drought Actions Sequence of Events

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Drought Management Options - Supply Side

8203.D1 - Increase the annual abstraction quantity from Llyn Llygad Rheidol Option Name Increase the annual abstraction quantity from Llyn Llygad Rheidol

Trigger(s) Drought- Prepare Drought Permit application (or preceding actions) Severe Drought- Seek a Drought Permit solution for supply side options 1 to 3.

Yield of action Up to 5 Ml/d Ml/day unless stated otherwise The abstraction licence for the Llyn Llygad Rheidol sources (the reservoir and the Maesnant stream) was varied in September 2007 to allow a total daily abstraction rate of 5 Ml/d and a total annual abstraction rate of 929.2 Ml. In a dry year, the annual licence quantity would only allow a daily abstraction at

5 Ml/d for 186 days. This option has the benefit of allowing improved flexibility in the operation of the two storage reservoir sources; however, this would be achieved without increasing the overall authorised annual quantity. This would have the effect of making more use of the resource in the reservoir. Location North Ceredgion Area affected or whole supply zone

Implementation timetable Total 8 weeks: Preparation time, time of year 1 week application preparation Option Implementation Assessment Implementation Option effective, duration We assume a decision from NRW within 6 weeks of submitting the Drought Permit application. The practical implementation of the option could be effected within 1 week. This option could be implemented at any time of year. Drought permits are valid for up to 6 months. Permissions required and Drought Permit - NRW constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals

Risks associated with option Non-granting of Drought Permit by NRW

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Risk to the Environment (High/Medium/Low or unknown) Low Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared impacts for this drought permit in 2009. The EMP does not Include details for features of constitute an Environmental Assessment Report (EAR) moderate and major sensitivity and which would describe the potential impacts of drought minor sensitivity features from permit implementation on sensitive features. However, designated sites the EMP does present a hydrological assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought permit implementation includes Nant-y-Llyn from Llyn Llygad Rheidol to the confluence with the Afon Hengwn (minor hydrological impact). Negligible impacts are

anticipated on Llyn Llygad Rheidol and flows in the Afon Hengwn. Resulting impacts of changes to the flow regime on ecological features including macrophytes, macroinvertebrates and fish are considered unlikely to be significant. No designated sites have been identified that have the potential to be impacted during drought permit implementation. Another possibility is that the potential impact is

reservoir refill and spill will take longer after the Environmental Assessment Environmental drought event has ended, as storage would start from a lower base position. Baseline information used An EMP was prepared for this drought option in 2009 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought permit, was agreed by DCWW monitoring requirements and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for: reservoir levels, physico-chemical water quality, brown trout, eel, lamprey, macroinvertebrates and macrophytes. Mitigation measures Mitigation measures were identified in the EMP. These include: Physical modification to existing structures that could present as barriers to fish migration, relocation of fish upstream of migratory barriers, installation of flow deflectors, creation of alternative refuges in deeper water and if identified as required, fish rescue in

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consultation with NRW and/or restocking using offspring of broodstock from the catchment. Impact on other activities No significant impacts on landscape and visual amenity, e.g. fisheries, industry etc recreation (including angling) and archaeology and cultural heritage are anticipated.

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8203.D2 – Pumped Abstraction from Nantymoch (an HEP reservoir) into the raw water main between Llyn Llygad Rheidol Reservoir and Bontgoch WTW Option Name Pumped abstraction from Nantymoch (an HEP reservoir) into the raw water main between Llyn Llygad Rheidol Reservoir and Bontgoch WTW Trigger(s) Drought- Prepare Drought Permit applications (or preceding actions) Severe Drought- Seek a Drought Permit solution for supply side options 1 to 3. Yield of action 5 Ml/d Ml/day unless stated otherwise Location North Ceredgion Area affected or whole supply zone Implementation timetable Total 7 weeks: Preparation time, time of year 1 week application preparation effective, duration We assume a decision from NRW within 14 days of submitting the Drought Permit application. The practical implementation of the option could be effected within 4 weeks, providing that the feasibility of pumping through the gravity main had been tested and had achieved favourable results. Drought permits are valid for up to 6 months. Permissions required and Drought Permit and agreement from the HEP company. constraints Option Implementation Assessment Implementation Option Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Ecological impact has not been assessed but as the reservoir is operated to make Hydro Electric Power releases to the Afon Rheidol at rates of up to 160 Ml/d, the negotiated abstraction would fall within the range of the existing HEP abstraction regime. It is likely that the diversion of this amount for public water supply would make no difference to the reservoir performance or the highly artificial flow regime of the Rheidol.

Risk to the Environment Unknown; assumed to be low. HRA Screening did not (High/Medium/Low or unknown) identify likely significant effects on any European designated sites. Ecological impact has not been assessed but as the reservoir is operated to make Hydro Electric Power releases to the Afon Rheidol at rates of up to 160 Ml/d, the negotiated abstraction would fall within the range of Statkraft’s existing abstraction regime. It is likely that the diversion of this amount for public water supply

would make no difference to the reservoir performance Environmental Assessment Environmental or the highly artificial flow regime of the Rheidol.

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Summary of likely environmental impacts Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites Baseline information used

Summary of additional baseline monitoring requirements Mitigation measures

Impact on other activities e.g. fisheries, industry etc

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8203.D3 - Reduce the compensation release from Llwn Craig Y Pistyll by 50% Option Name Reduce the compensation release from Llyn Craig Y Pistyll by 50% Trigger(s) Drought- Prepare Drought Order/ Permit applications (or preceding actions) Severe Drought- Seek a Drought Permit solution for supply side options 1 to 3. Yield of action 0.9 Ml/d Ml/day unless stated otherwise Location North Ceredigion Area affected or whole supply zone Implementation timetable Total 6 weeks:

Preparation time, time of year 1 week application preparation

effective, duration We assume a decision from NRW within 28 days of submitting the Drought Permit application. The practical implementation of the option could be effected within 1 week. Drought permits are valid for up to 6 months. Permissions required and Drought Permit-NRW constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals

Risks associated with option Non-granting of Drought Permit by NRW Option Implementation Assessment Assessment Implementation Option Risk to the Environment Unknown: The Generic Environmental Plan will be (High/Medium/Low or unknown) applied to this site, and a site specific Environmental Monitoring Plan will be produced with a Drought Plan review. HRA Screening did not identify likely significant effects on any European designated sites. Summary of likely environmental impacts Include details for features of moderate and major sensitivity and minor sensitivity features from

designated sites

Baseline information used

Summary of additional baseline monitoring requirements Mitigation measures

Impact on other activities

e.g. fisheries, industry etc Environmental Assessment Assessment Environmental

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Craig y Pistyll and Llygad Rheidol Combined Storage - Drought Action Zones 100 NORMALOPERATION 90

80 DEVELOPING DROUGHT 70

60 DROUGHT

40 ReservoirStorage (%) SEVERE DROUGHT 30

EMERGENCY STORAGE 10

Figure 29 – Craig y Pistyll and Llygad Rheidol Combined Drought Action Zones

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Pembrokeshire - 8206

Location Plan 30 - Pembrokeshire Water Resources Zone

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Pembrokeshire Water Resources No. Location Licence No. Type 1 Western Cleddau at Crowhill 22/61/03/0001 River Intake 2 Eastern Cleddau at Canaston 22/61/04/0010 Regulated River Intake 3 Pendine Borehole Licence Exempt Groundwater Abstraction 4 Valley Court Licence Exempt Groundwater Abstraction 5 Milton Boreholes Licence Exempt Groundwater Abstraction 6 Preseli Reservoir 22/61/04/0001 Impounding Reservoir 7 Pont Hywel Intake 22/61/04/0003 River Intake 8 Llys-Y-Fran Reservoir 22/61/04/0038 Impounding Reservoir 9 Middle Mill 22/61/02/0031 Stream Intake Table 58 - Pembrokeshire Abstraction Licences

The location of the WRZ is shown on the Welsh Water Area map (Figure 1) and the location of the resources are shown on Figure A49. Drought Control Lines have been defined for Preseli and Llys-y- Fran Reservoirs, as shown in Figures A50 and A51 and drought actions are given in Table A43. Current Resource Status In earlier versions of the Drought Plan, Welsh Water reported separately for the WRZ’s of North Pembrokeshire and South Pembrokeshire. With the completion of a link main in 2004, the two WRZs have now been joined and create a single Pembrokeshire WRZ and will be reported as such for the future. The largest treatment works in the WRZ is located at Bolton Hill, which is supplied by an abstraction at the Canaston intake on the Eastern Cleddau, which in turn is supported by river regulation releases from Llys-y-Fran Reservoir and also by an abstraction on the Western Cleddau at Crowhill WPS and this is a direct river abstraction with a prescribed-flow condition. In addition to potable water production for public water supply, the Canaston/Crowhill – Bolton Hill arrangement supplies raw industrial water to the Oil Refineries, Liquid Petroleum Gas Tank Farms and Electricity Generators South and North of Milford Haven. Preseli Reservoir is located upstream of Llys-y-Fran Reservoir and the compensation discharge from Preseli Reservoir flows into Llys-y-Fran. Welsh Water is able to support Rosebush WTW with an abstraction from Llys-y- Fran and a river abstraction from the Eastern Cleddau at Pont Hywel, which provides a pump-refill facility for Preseli. However, the abstraction at Pont Hywel is subject to a Hands-Off-Flow condition. The stand-by source at Milton Boreholes is available when there is high demand in Tenby and the southern part of the WRZ cannot be sustained from Bolton Hill WTW alone. Similarly Pendine borehole augments supplies to the eastern part of the WRZ under similar conditions. Under extreme drought conditions the constraint becomes the storage in Llys-y-Fran Reservoir, which can suffer from significant drawdown. During periods of high demand the pipeline capacity over the Cleddau Bridge is also a constraint to delivering water south of the Haven. A compensation release from Llys-y-Fran Reservoir is required of 13 Ml/d when regulation releases are not being made, but usually the reservoir moves from spill to regulation within a matter of

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weeks. As such Welsh Water believes that there would be little or no savings to be gained by modifying the compensation discharge in a single season drought. The Cleddau Rivers (Eastern and Western) are designated as a Special Area of Conservation (SAC) under the Habitats Regulations. Any changes to our authorised operation will have to reflect the sensitivities of this designation. The Cleddau Rivers SAC has been subject to the Review of Consents process undertaken by the Environment Agency Wales to meet their obligations under the EU Habitats Directive. The assessment considers the river flow requirements needed to support the designated species and the potential impact from our operations. The EAW have so far been unable to conclude ‘no adverse affect’ from our current operations and we are awaiting the formal licence modifications. They have also raised concerns over the potential for our intakes along the rivers to entrain fish. Once the formal licence modifications have been received, we will assess the impact on our operations during a drought and consider modifying the Drought Plan accordingly. For 2012/ 2013 the average demand was 38.38 Ml/d and the peak week demand was 45.47 Ml/d.

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Drought Actions – Sequence of Events Resource Demand Side Actions Supply Side/ Operational Actions Communications key messages and actions Position Normal Weekly monitoring of rainfall, reservoir and Abstraction remains within licence, within Use the water that you need but please don’t waste it demand levels. operational rules and within quality constraints General Water Efficiency Campaigns via: Ongoing leakage maintenance and water - Radio efficiency work streams. - Education Centres Preplanning for the implementation of ‘Media Campaign with Water Efficiency Device Offering’ - Water Efficiency Web Page and ‘Enhanced Leakage Management’ option. Developing Raise and increase awareness of the importance Commence increased liaison with operational Use what you need but please don’t waste water. Drought of water conservation measures through the colleagues and NRW in line with Management and We increasingly need your help to conserve water supplies. established media campaigns as per the Communications Plan. communication plan which will include requests We are also doing our bit by ensuring we fix leaks quickly to When summer demands south of the Haven and in for voluntary restraint. prevent waste the Tenby area increase to the point where Progress ‘Media Campaigns with Water Efficiency Orielton, Norchard and Pentlepoir Service Continuation of Normal Activities plus Enhanced targeted Water Device Offering’ option Reservoir Levels are difficult to maintain, then the Efficiency Messaging via: standby source of Milton Boreholes would be Undertake ‘Enhanced Leakage Management’ brought back into supply. - Local Radio option Review and implement where feasible tankering to - Target social media Supply / demand situation continually monitored support lower resource and/ or from neighbouring throughout the drought situation and the - Prepare and Publish DCWW Drought Web Page zone. effectiveness of demand-side measures. TUB consultation via Printed media Continuation of preceding options. Preplanning for the implementation of TUBs and NEUBs. Drought Increasing public awareness and content of new Within WRZ support for vulnerable sources. We’ve introduced a temporary hosepipe ban as a last resort to demand-side measures to be included in media help conserve water supplies Implement environmental monitoring in line with campaign and as aligned with the communication Monitoring Plan. Ask you to respect this to ensure supplies to people in the area plan.) are conserved Review current operational activities to preserve Introduction of TUBs (Saving of 0 – 5% demand, 0 resource. Thank you in advance for your cooperation – 1.82 Ml/d).

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Continuation of preceding options. Continue to review and implement where feasible Implement TUBS tankering to support lower resource and/ or from Preplanning for the implementation of NEUBs. Continuation of Previous Techniques plus Enhanced messaging via: neighbouring zone. - Local Radio Prepare Drought Order/ Permit applications. - Targeted social Media - Plus Call Centre Pre recorded Messages - Targeted messaging through texting service Media interviews with Senior Managers produced via TV and Radio Preparation for NEUB Via Chamber of Commerce and Trade Bodies Severe Continuation of preceding options. When the storage in Llys-y-Fran reservoir falls into Continuation of Previous Activities with the enhanced message Drought the Severe Drought zone then a Drought Order Increasing public awareness and content of new We appreciate your help so far in observing the temporary use solution will be pursued to supply side option 1. demand-side measures to be included in media restrictions campaign and as aligned with the communication When the storage in Preseli Reservoir falls into the Water levels are at very low levels so we ask you think carefully plan.) Severe Drought zone then a Drought Order/ Permit about the waster you use solution will be pursued to supply side options Introduction of NEUBs (Saving of 0 – 5% NHH 8206.D1, D2, D4, D5, and D6 (Option 6 is most Urge you not to waste any water demand, 0 – 3.64 Ml/d). appropriate to implement during the autumn / Implementation of NEUB Implementation of Emergency Drought Orders as winter period). Last Resort (Saving likely 0-10%, 0 – 6.19 Ml/d) Non-essential use restrictions will be implemented. This is a last resort but essential if going to conserve supplies for customers. - Local Media - Text Service Engagement with Chamber of Commerce and Trade Bodies Preparation for Emergency Drought Orders Media Campaign Media Interviews with Senior Managers produced via TV and Radio Table 59 - Pembrokeshire Drought Action Sequence of Events

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Drought Management Options - Supply Side

8206.D1 - Reduce the required prescribed flow below the Crowhill Abstraction Option Name Reduce the required prescribed flow below the Crowhill Abstraction Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe Drought- When the storage in Llys-y-Fran reservoir Preseli Reservoir falls into severe drought zone the Drought Order solution will be pursued Yield of action 3 Ml/d Ml/day unless stated otherwise Location West Pembrokeshire Area affected or whole supply zone Implementation timetable Tota 6 weeks: Preparation time, time of year 1 week application preparation effective, duration We assume a decision from WG within 28 days of submitting the Drought Order application. The practical implementation of the option could be effected within 1 week. The option is most likely to be implemented during the summer period. Option Implementation Assessment Implementation Option Drought orders are valid for up to 6 months. Permissions required and Drought Order-WG constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Non-granting of Drought Permit by NRW Reduced flow in Western Cleddau through Haverfordwest to tidal limits Risk to the Environment

(High/Medium/Low or unknown) High

Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared impacts for this drought order in 2007. The EMP does not Include details for features of constitute an Environmental Assessment Report (EAR) moderate and major sensitivity which would describe the potential impacts of drought and minor sensitivity features from order implementation on sensitive features. However, designated sites the EMP does present a hydrological assessment which lists the likely impacts of drought order implementation on the flow/level regime in the impacted waterbodies.

Environmental Assessment Environmental In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive

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ecological receptors. The zone of hydrological influence of drought permit implementation includes the River Western Cleddau from Crowhill intake to the tidal limit (1.27km, major hydrological impact). Resulting impacts of the changes to the flow regime on ecological features including macroinvertebrates (including freshwater pearl mussel and white-clawed crayfish if present), macrophytes and fish (including lamprey species, Atlantic salmon and sea/brown trout) are likely to be significant. The Western Cleddau forms part of the Afonydd Cleddau/Cleddau Rivers (Eastern and Western) SAC and Afon Cleddau Gorllewinol/River Western Cleddau SSSI. The changes to the flow and level regime as a result of drought order implementation are anticipated to result in significant impacts on designated features of the SAC and SSSI. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought order was agreed by DCWW monitoring requirements and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for: river cross section and wetted area, geomorphology, physico- chemical water quality, phytoplankton, salmonids, bullhead, lamprey, macroinvertebrates, white clawed crayfish, freshwater pearl mussel and macrophytes. Mitigation measures Mitigation measures were identified in the EMP. These include: Reestablishment of macrophyte communities in impacted reaches, artificial channel narrowing, habitat enhancement, phased changes in compensation flow regime, installation of flow deflectors, creation of refuges, fish rescue in consultation with NRW and/or restocking using offspring of broodstock from the catchment, removal of freshwater pearl mussels to hatchery. Impact on other activities No significant effects to landscape and visual amenity, e.g. fisheries, industry etc recreation and archaeology and cultural heritage are anticipated. Impacts on angling may be significant.

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8206.D2 - Reduce the Compensation release from Preseli Reservoir by 50% Option Name Reduce the Compensation release from Preseli Reservoir by 50% Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe Drought- When the storage in Preseli Reservoir falls into the Severe Drought zone then a Drought Order solution will be pursued Yield of action 0.9 Ml/d Ml/day unless stated otherwise Location North Pembrokeshire Area affected or whole supply zone Implementation timetable Total 6 weeks: Preparation time, time of year 1 week application preparation effective, duration We assume a decision from NRW within 28 days of submitting the Drought Permit application.

The practical implementation of the option could be effected within 1 week. The option is most likely to be implemented during the summer and autumn period. Drought permits are valid for up to 6 months. Permissions required and Drought Permit- NRW constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Non-granting of Drought Permit by NRW Reduced flows below the reservoir in the Syffynwy

before it flows into Llys-y-Fran Reservoir. Option Implementation Assessment Assessment Implementation Option Risk to the Environment (High/Medium/Low or unknown) Medium-High Summary of likely environmental An Environmental Monitoring Plan (EMP) was prepared impacts for this drought permit in 2007. The EMP does not Include details for features of constitute an Environmental Assessment Report (EAR) moderate and major sensitivity which would describe the potential impacts of drought

and minor sensitivity features from permit implementation on sensitive features. However, designated sites the EMP does present a hydrological assessment which lists the likely impacts of drought permit implementation on the flow/level regime in the impacted waterbodies. In the absence of an EAR, professional judgment has been used to determine the likely significance of the effects of flow/level regime changes on sensitive ecological receptors. The zone of hydrological influence of drought order

implementation includes the Afon Syfynwy from Preseli Environmental Assessment Assessment Environmental

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Reservoir outflow to Llys-y-Fran Reservoir inflow (minor hydrological impact). Resulting impacts of changes to the flow regime on ecological features including macrophytes, macroinvertebrates and fish are considered unlikely to be significant. It is noted that the upper Syfynwy catchment, above Llys-y-Fran Reservoir, is not accessible to migratory fish (including sea and river lmprey). The Afon Syfynwy forms part of the Afon Cleddau Dwyreiniol SSSI and the Afonydd Cleddau/Cleddau Rivers SAC, which is designated for Ranunculion fluitantis and Callitricho-Batrachion vegetation, active raised bogs, alluvial forests with Alnus glutinosa and Fraxinus excelsior, lamprey species, bullhead and otter. Compensation and river regulation releases from Llys-y- Fran reservoir will not be altered during implementation of this drought order. It is not anticipated that there will be significant effects on designated features of the SAC or SSSI, however further assessment is required to confirm this. Baseline information used An EMP was prepared for this drought option in 2007 and utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional baseline The EMP for this drought order was agreed by DCWW monitoring requirements and NRW (then Environment Agency Wales and CCW). The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for: reservoir level and outflow, river flows, river cross section and wetted area, geomorphology, physico-chemical water quality, phytoplankton, salmonids, bullhead, lamprey, macroinvertebrates, white clawed crayfish (if present) and macrophytes. Mitigation measures Mitigation measures were identified in the EMP. These include: Reestablishment of macrophyte communities in impacted reaches, habitat enhancement, phased changes in compensation flow regime, installation of flow deflectors, creation of refuges, fish rescue in consultation with NRW and/or restocking using off spring of broodstock from the catchment. Impact on other activities No significant effects to landscape and visual amenity, e.g. fisheries, industry etc recreation (including angling) and archaeology and cultural heritage are anticipated.

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8206.D3 - Increase the direct abstraction from Llys y Fran Reservoir and remove the Section 158 restrictions, if applicable Option Name Increase the direct abstraction from Llys-y-Fran Reservoir and remove the Section 158 restrictions, if applicable Trigger(s) Drought- Consider option (or preceding actions) Severe Drought- implement option Yield of action 2 Ml/d Ml/day unless stated otherwise Location North Pembrokeshire Area affected or whole supply zone Implementation timetable Total 6 weeks: Preparation time, time of year 1 week application preparation effective, duration We assume a decision from NRW within 28 days of

submitting the Drought Permit application.

The practical implementation of the option could be effected within 1 week. The option is most likely to be implemented during the summer and autumn period. Drought permits are valid for up to 6 months. Permissions required and Covered by existing abstraction licence constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Additional pumping would be required. The capacity of

the pipeline needs confirming Option Implementation Assessment Assessment Implementation Option Risk to the Environment Low: The option is within the existing abstraction (High/Medium/Low or unknown) licence, therefore, no Environmental Monitoring Plan required.

The consequence will be to reduce the storage in Llys-y- Fran reservoir and have a slight impact on the water available for release for regulation purposes. This is

considered to have a minimal impact during a drought event. There is a potential modest environmental impact in that reservoir refill and spill may take marginally longer as storage would start from a lower base position. Summary of likely environmental impacts Include details for features of moderate and major sensitivity

and minor sensitivity features from Environmental Assessment Assessment Environmental

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designated sites

Baseline information used

Summary of additional baseline monitoring requirements Mitigation measures

Impact on other activities e.g. fisheries, industry etc

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8206.D4 - Reduce the prescribed flow required at the Pont Hywel abstraction Option Name Reduce the Prescribed flow required at the Pont Hywel abstraction Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe Drought- When the storage in Preseli Reservoir falls into the Severe Drought zone then a Drought

Order solution will be pursued Yield of action 2 Ml/d Ml/day unless stated otherwise Location North Pembrokeshire Area affected or whole supply zone Implementation timetable Total 6 weeks: Preparation time, time of year 1 week application preparation effective, duration We assume a decision from NRW within 28 days of submitting the Drought Permit application. The practical implementation of the option could be effected within 1 week. Drought permits are valid for up to 6 months. Option Implementation Assessment Implementation Option Permissions required and constraints Drought Order-WG Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with option Non-granting of Drought Permit by NRW

Risk to the Environment Unknown: likely to be Medium - High. (High/Medium/Low or unknown) The Generic Environmental Plan will be applied to this site, and a site specific Environmental Monitoring Plan will be produced with a Drought Plan review. HRA Screening identified potential for likely significant

effects on Cleddau Rivers SAC.

Summary of likely environmental impacts Include details for features of moderate and major sensitivity and minor sensitivity features from designated sites Baseline information used

Environmental Assessment Environmental Summary of additional baseline monitoring requirements Mitigation measures

Impact on other activities e.g. fisheries, industry etc

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8206.D5 - Abstraction from the Afon Taf Option Name Abstraction from the Afon Taf

Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe Drought- When the storage in Preseli Reservoir falls into the Severe Drought zone then a Drought Order solution will be pursued Yield of action 5 to 10 Ml/d Ml/day unless stated otherwise Location South and East Pembrokeshire areas Area affected or whole supply zone Implementation timetable Total up to 13 weeks Preparation time, time of 1 week application preparation year effective, duration We assume a decision from WG within 28 days of submitting the Drought Order application. The practical implementation of the option could be effected within 4 – 8 weeks. The option is most likely to be implemented during the summer and autumn period, although it could be

implemented at any time during the year. Drought orders are valid for up to 6 months Permissions required and Drought Order-WG constraints Including details of liaison carried out with bodies responsible for giving any permits or approvals Risks associated with Non-granting of Drought Order by WG and requires new option temporary weir, abtraction, treatment, pumping and pipeline to link into existing distribution network. Timeframe: It may not be possible to implement this option

within 8 weeks due to unforeseen engineering implications. Option Implementation Assessment Assessment Implementation Option Risk to the Environment Medium-High (High/Medium/Low or

unknown) Summary of likely An Environmental Assessment Report (EAR) has been environmental impacts prepared for this drought option. Include details for features The zone of hydrological influence of drought permit of moderate and major implementation includes the Afon Taf from the location of sensitivity and minor the intake to the tidal limit (minor hydrological impact). The sensitivity features from lower reach of the Afon Taf, downstream of the tidal limit designated sites (and outside of the zone of influence of the drought order) is designated as both an SAC and SSSI (Carmarthen Bay and

Estuaries SAC and Aber Taf SSSI). The SAC is designated for a Environmental Assessment Assessment Environmental

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range of estuarine and coastal habitats as well as for shad and lamprey species. The EAR concluded negligible to minor adverse impacts of the drought order on all ecological receptors except upstream migration of Atlantic salmon/sea trout, lamprey and shad species, for which the impact of the drought order was assessed as moderate adverse. Impacts are associated with the construction of the temporary weir, which would introduce a potential barrier to upstream fish migration. The drought order has the potential to affect designated features of the Carmarthen Bay and Estuaries SAC and Aber Taf SSSI through effects on migratory fish. Baseline information used The Environmental Assessment Report prepared in 2012 utilised available information from surveys and investigations undertaken by DCWW and NRW. Summary of additional The Environmental Monitoring Plan (EMP) sets out the baseline monitoring monitoring that would be required if a drought order is requirements implemented, and is presented in the EAR. The EMP for the Afon Taf at Llanddowror drought order was prepared in 2012 and agreed by DCWW and NRW. The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for; river flows, physico- chemical water quality, juvenile Atlantic salmon sea/brown trout, lamprey and shad species. Mitigation measures Mitigation measures were identified in the EAR. These include: Incorporation of fish passage facilities into the design of the temporary weir, and the selection of a ‘fish-friendly’ or screened pump for abstraction. The requirement for fish passage facilities to be incorporated within the design of the temporary weir should be discussed and agreed with NRW. Access agreements with riparian landowners for canoe/kayak portage (between the 2 river access points) should be arranged. Mitigation should be discussed with Canoe Wales and could include measures to aid canoe/kayak removal from and launch into the river at either side of the temporary weir. Impact on other activities The environmental studies identified the following adverse e.g. fisheries, industry etc impacts on other activities: The temporary weir will form an in-river barrier to canoes and kayaks. These impacts to canoeing and kayaking have been assessed as moderate and temporary, at any time of year. Impacts to angling if the drought order is in place during the period June to October.

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8206.D6 - Reduction in the statutory compensation release from Llys y Fran Reservoir to the Afon Syfynwy of 7.64 Ml/d from 13.64 Ml/d to 6 Ml/d Option Name Reduction of 7.64 Ml/d in the statutory compensation release from Llys y Fran Reservoir to the Afon Syfynwy from 13.64Ml/d to 6Ml/d Trigger(s) Drought- Prepare Drought Order (or preceding actions) Severe Drought- When the storage in Preseli Reservoir falls into the Severe Drought zone then a Drought Order solution will be pursued Yield of action Ml/day unless stated otherwise 7.64Ml/d Location Whole supply Zone Area affected or whole supply zone Implementation timetable Total 6 weeks: Preparation time, time of year 1 week application preparation effective, duration We assume a decision from WG within 28 days of submitting the Drought Order application.

1 week practical implementation

The option is most likely to be implemented during the autumn/winter period to aid refill of Llysyfran reservoir, although it could be implemented at any time during the year. Drought orders are valid for up to 6 months Permissions required and constraints Including details of liaison carried Drought Order- WG out with bodies responsible for giving any permits or approvals Risks associated with option

Non-granting of Drought Order by WG Option Implementation Assessment Assessment Implementation Option Risk to the Environment (High/Medium/Low or unknown) Medium-High Summary of likely environmental An Environmental Assessment Report (EAR) has been

impacts prepared for this drought option. Include details for features of The zone of hydrological influence of drought permit moderate and major sensitivity and implementation includes the Afon Syfynwy from Llys-y- minor sensitivity features from Fran Resrevoir to the confluence with the Eastern designated sites Cleddau River (major hydrological impact), and the Eastern Cleddau River from the confluence with the Afon Syfynwy to the tidal limit (minor hydrological impact). The EAR concluded negligible to minor adverse impacts of the drought order on macrophytes, negligible to

moderate adverse impacts on macroinvertebrates and Environmental Assessment Assessment Environmental

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fish species except adult upstream migration of Atlantic salmon/sea trout species, for which the impact of the drought order was assessed as major adverse in the Afon Syfynwy. The Afon Syfynwy and Eastern Cleddau are designated as both an SAC and SSSI. The SAC is designated for its Rannunculion/Callitricho habitat, alluvial forests and active raised bogs as well as for lamprey species, bullhead) and otter. The changes to the flow and level regime as a result of drought order implementation are anticipated to result in significant impacts on designated features of the SAC and SSSI. Baseline information used The Environmental Assessment Report prepared in 2012 utilised available information from surveys and investigations undertaken by DCWW and NRW. In addition, a programme of environmental monitoring was undertaken in 2012. Summary of additional baseline The Environmental Monitoring Plan (EMP) sets out the monitoring requirements monitoring that would be required if a drought order is implemented, and is presented in the EAR. The EMP for the Llys y Fran and Afon Syfynwy drought order was prepared in 2012 and agreed by DCWW and NRW. The EMP recommended baseline monitoring, and monitoring that should be undertaken during and after implementation of a drought order for; river flows, physico-chemical water quality, macroinvertebrates, juvenile Atlantic salmon sea/brown trout, lamprey and bullhead species. Mitigation measures Mitigation measures were identified in the EAR. These include: Additional flow management measures, in-channel management measures, point source pollution management measures and direct ecological intervention measures to mitigate for water quality impacts. Potential ecological mitigation measures proposed in the EAR include: relocation or re-colonisation, dependent on species; if necessary, fish rescue and / or habitat enhancement; and; re-stocking of fish species using offspring of broodstock from the catchment. Impact on other activities The EAR identified the following adverse impacts on e.g. fisheries, industry etc other activities: Minor adverse impacts on landscape and visual amenity adjacent to the Afon Syfynwy. Impacts to angling if the drought order is in place during October. Negligible impacts to all other recreational activities and archaeology and cultural heritage.

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Llys y Fran Reservoir Drought Action Zones 100

90 NORMALOPERATION

DEVELOPING DROUGHT 70

60 DROUGHT

40 ReservoirStorage (%) SEVERE DROUGHT

EMERGENCY STORAGE 10

Figure 30 - Llys y Fran Drought Action Zones

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Preseli Reservoir Drought Action Zones 100

90 NORMALOPERATION

80 DEVELOPING DROUGHT 70

60 DROUGHT

40 SEVERE DROUGHT ReservoirStorage (%)

EMERGENCY STORAGE 10

Figure 31 - Preselli Reservoir Drought Action Zones