Environmental Statement 6.2 Brechfa Forest Connection Development Consent Order Application - Reference EN020016 Environmental Statement Appendix 13.1 Hydrology, flood risk and drainage data tables May 2015 Regulation reference: The Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009 Regulation 5(2)(a) Environmental Statement – Appendix 13.1 – Volume 6.4 Contents Tables Table 1 Watercourses along Proposed Development Table 2 Nant Pibwr recorded water quality Table 3 River Towy recorded water quality Table 4 Nant Crychiau recorded water quality Table 5 River Gwili (near Abergwili) recorded water quality Table 6 River Gwili (near Llanllawddog) recorded water quality Table 7 River Pib recorded water quality Table 8 Hydrological features along Proposed Development Table 9 Surrounding watercourses near Burry Port Substation Table 10 Barnaby Pil recorded water quality Table 11 Hydrological features near New Lodge Substation, Burry Port Table 12 Surrounding watercourses near main construction compound Table 13 Tawelon recorded water quality Table 14 Surrounding watercourses near satellite construction compound 1 Environmental Statement – Appendix 13.1 – Volume 6.4 Table 1 – Watercourses along Proposed Development Watercourse Name Approximate Profile (observed from site visit/ Crossing Location aerial mapping) Nant Morlais 240452, 211290 Small stream, approx 1m wide flowing south easterly towards Gwendraeth Fach. Tributary of Nant 241427, 212975 Very small field boundary ditch, Morlais heavily overgrown, flows in south westerly direction. Tributary of Nant 242160, 214522 Very small field boundary ditch, Trhydw heavily overgrown. Tributary of Nant 243666, 215927 Very small field drain, flows in north Cwmffrwd westerly direction towards Nant Cwmffrwd. Nant Cwmffrwd 244099, 216417 Small watercourse, 1-2m wide, meandering and overgrown near crossing location, flows in a westerly direction. Tributary of Nant Pibwr 244686, 217437 Very small ditch, heavily overgrown. Tributary of Nant Pibwr 244708, 218203 Very small ditch, heavily overgrown, flowing north towards Nant Pibwr. Nant Pibwr 243965, 218424 Main River, approximately 2-3m wide, meandering (straight at crossing point), vegetation lined banks, flows in a westerly direction towards the River Towy. Tributary of Nant Pibwr 243916, 218682 Very small field boundary ditch, heavily overgrown. Tributary of River Towy 243583, 219321 Very small field boundary ditch, tree lined. River Towy 243441, 220147 Main River, 30m wide, meandering, associated flood plain (GB110060029590). 2 Environmental Statement – Appendix 13.1 – Volume 6.4 River Gwili Nr 243364, 220909 Main River, approximately 15m wide, straight channel, sparse vegetation on banks, flows southerly towards confluence with Towy (GB110060029080). Bwlch Stream 243518, 220647 Main River, small watercourse approx 1-2m wide, flows from Bishop’s Pond to Afon Gwili. Tributary of Bwlch 243468, 220703 Small watercourse, approx <1m wide Stream flows from Abergwili to Bwlch Stream. Abergwili Mill Leat 243352, 220730 Main River small watercourse approx 1m wide, flows from north of Abergwili Road to confluence with Bwlch Stream, vegetated banks. The Abergwili Mill Leat is approximately 0.8km in length. The watercourse was dry when site visit was undertaken on 19/9/2014 by RSK hydrologist. Nant Crychiau 243333, 221551 Small, straight watercourse, approx 4- 5m wide, tree lined banks, flows south westerly towards Gwili (GB11006029070). Tributary of River Gwili 243329, 222099 Small ditch, approx 1m wide flows in southerly direction towards Gwili. Nant Felys 242781, 224121 Small, shallow watercourse, 1m wide, meandering and overgrown near crossing location, flows in a south westerly direction. Tributary of Nant 243505, 225344 Small ditch, approx 1m wide flows in Brechfa northerly direction towards Nant Brechfa. Nant Brechfa 243505, 226192 Small watercourse, approx 2m wide, tree lined banks, flows westerly towards Gwili. Tributary of Nant 243508, 227164 Small ditches, approx 1m wide flows Brechfa in southerly direction towards Nant Brechfa. 3 Environmental Statement – Appendix 13.1 – Volume 6.4 Tributary of Nant 243806, 227943 Small ditch, approx 1m wide flows in Corrwg northerly direction towards Nant Corrwg. Nant Corrwg 243722, 228437 Small, watercourse, approx 2m wide, tree lined banks, flows north towards Gwili. River Gwili 243942, 228327 Main River, approx 5m wide, meandering, sparse/intermittent vegetation on banks, flows westerly (GB110060029080). Nant y Boncath 243994, 229001 Small, shallow watercourse, 1m wide, straight and overgrown near to proposed route, flows in a southerly direction. Tributary of Nant y 244261, 229547 Small ditch, approx 1m wide, Boncath overgrown, flows in westerly direction towards Nant y Boncath. Nant y Boncath 244156, 229895 Small, shallow watercourse, 1m wide, straight and overgrown near to proposed route, flows in a southerly direction. Nant Alltwalis Nr 3243777, 230721 Small watercourse, heavily wooded banks, flows south westerly towards Gwili. Tributary of Nant 243976, 230562 Small ditch, tree lined and vegetated Alltwalis banks, flows westerly towards Nant Alltwalis Tributary of Nant 244755, 230888 Small ditch, tree lined and vegetated Alltwalis banks, flows north westerly towards Nant Alltwalis. Tributary of Nant 245374, 231471 Small ditch, heavily wooded banks, Alltwalis flows north westerly towards Nant Alltwalis. Nant Aerau 246825, 231573 Small watercourse, heavily wooded banks, flows south westerly, source close to proposed route. 4 Environmental Statement – Appendix 13.1 – Volume 6.4 Nant Cwm Dafydd 247062, 231469 Small watercourse, heavily wooded banks, flows south westerly, source close to proposed route. Tributary of River Pib 248092, 231665 Small ditch, heavily wooded banks, flows north easterly towards River Pib, source close to proposed route. Tributary of River Pib 248490, 231278 Small ditch, heavily wooded banks, flows north easterly towards River Pib, source close to proposed route. Tributary of River Pib 248777, 231201 Small ditch, heavily wooded banks, flows north easterly towards River Pib, source close to proposed route. Tributary of River Pib 249054, 230643 Small ditch, heavily wooded banks, flows north easterly towards River Pib, source close to proposed route. Tributary of River Pib 250029, 230394 Small ditch, heavily wooded banks, flows easterly towards River Pib. 5 Environmental Statement – Appendix 13.1 – Volume 6.4 Table 2 – Nant Pibwr recorded water quality Waterbody Name Nant Pibwr Grid Reference of intersect point 243965, 218424 WFD Waterbody ID GB110060029260 WFD Status Objective 2027 overall, 2027 ecological (2015/2021/2027) Hydromorphological Designation Not designated A/HMWB Designations Freshwater Fish Directive, Natura 2000 (Habitats and/or Birds Directive) WFD Element Current Status Ecological Status Poor Biological Status Poor Chemical Status High Hydrology Not High Morphology High Fish Poor Macro-invertebrates High Ammonia High Dissolved Oxygen High pH High Phosphate High Temperature High 6 Environmental Statement – Appendix 13.1 – Volume 6.4 Table 3 – River Towy recorded water quality Waterbody Name Towy Grid Reference of intersect point 243441, 220147 WFD Waterbody ID GB110060029590 WFD Status Objective 2027 overall, 2015 chemical (2015/2021/2027) Hydromorphological Designation Heavily Modified Designations Freshwater Fish Directive, Natura 2000 (Habitats and/or Birds Directive) WFD Element Current Status Ecological Status Moderate Biological Status High Chemical Status High Macro-invertebrates High Ammonia High Dissolved Oxygen High pH High Phosphate High Temperature High 7 Environmental Statement – Appendix 13.1 – Volume 6.4 Table 4 – Nant Crychiau recorded water quality Waterbody Name Crychiau Grid Reference of intersect point 243333, 221551 WFD Waterbody ID GB110060029070 WFD Status Objective 2015 overall, 2015 ecological (2015/2021/2027) Hydromorphological Designation Not Designated A/HMWB Designations Not Designated WFD Element Current Status Ecological Status Moderate Biological Status Moderate Chemical Status Moderate Hydrology High Morphology Good Fish Good Macro-invertebrates Moderate Ammonia High Dissolved Oxygen High pH High Phosphate Moderate Temperature High 8 Environmental Statement – Appendix 13.1 – Volume 6.4 Table 5 – River Gwili (near Abergwili) recorded water quality Waterbody Name Gwili Grid Reference of intersect point N/A WFD Waterbody ID GB110060029080 WFD Status Objective 2015 overall, 2015 ecological (2015/2021/2027) Hydromorphological Designation Not Designated A/HMWB Designations Freshwater Fish Directive WFD Element Current Status Ecological Status Moderate Biological Status Good Chemical Status Good Hydrology High Morphology Good Fish Good Ammonia High Dissolved Oxygen High pH High Phosphate Moderate Temperature High 9 Environmental Statement – Appendix 13.1 – Volume 6.4 Table 6 – River Gwili (near Llanllawddog) recorded water quality Waterbody Name Gwili Grid Reference of intersect point 243942, 228327 WFD Waterbody ID GB110060036100 WFD Status Objective 2015 overall, 2015 ecological (2015/2021/2027) Hydromorphological Designation Not Designated A/HMWB Designations Freshwater Fish Directive WFD Element Current Status Ecological Status Good Biological Status High Hydrology High Morphology Good Invertebrates High Ammonia High Dissolved Oxygen High pH High Phosphate High Temperature High 10 Environmental Statement – Appendix 13.1 – Volume 6.4 Table 7 – River Pib recorded water quality Waterbody Name Pib Grid