Appendix 1 – Water Resource Zone Summaries

Appendix 1 – Water Resource Zone Summaries

Appendix 1 – Water Resource Zone Summaries 2 | P a g e 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 ....................................................................................................................................

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