Chapter 9: Road drainage and the water environment

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M1 JUNCTION 19 IMPROVEMENT ENVIRONMENTAL STATEMENT VOLUME 2 CHAPTER 9 – ROAD DRAINAGE AND THE WATER ENVIRONMENT Feature & ATTRIBUTE / SERVICE Flood Risk Floodplain: Conveyance of flood flows Quality Indicator Surface waters Groundwater Scale 1 , Details and Grading Regional / Local: Proposed Development within River Avon and Clay Coton Yelvertoft Brook 1:100 year indicative floodplain Local: Alluvial and river terrace gravel deposits with water table in places Importance Potential Impact Magnitude without Mitigation Medium Medium Potential increase in flood peak due to construction within flood plain Change in road runoff rates Residual loss of deposits during construction phase Minor adverse Minor adverse Magnitude with Mitigation (Negligible) Minor beneficial Significance of Effect (Neutral) Negligible Negligible Neutral Slight beneficial below 1m Local: Clay soils Low None (Negligible) (Negligible) (Neutral) 1 Assume that quality and rarity of the same grading and that all features of limited substitutability B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 44
M1 JUNCTION 19 IMPROVEMENT ENVIRONMENTAL STATEMENT VOLUME 2 CHAPTER 9 – ROAD DRAINAGE AND THE WATER ENVIRONMENT 9.8 INDICATION OF DIFFICULTIES ENCOUNTERED 9.8.1 Water quality data is not available for some of the tributaries of the River Avon in the study area. For these watercourses, it has been assumed that the quality is of the same high standard as the River Avon upstream of the junction, thus ensuring that a precautionary approach has been taken during the assessment. B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 45
Page 1: M1 Junction 19 Improvement Environm
Page 4 and 5: M1 JUNCTION 19 IMPROVEMENT ENVIRONM
Page 71 and 72: Appendix A - Pollution and Spillage
Page 73: Method D - Assessment of Pollution
Page 78 and 79: Groundwater: Hydrocarbons Hydrogeol
Page 83 and 84: Non Technical Summary Skanska Const
Page 85 and 86: Contents 1 Introduction 1 1.1 Overv
Page 87 and 88: 1 Introduction 1.1 Overview Jacobs
Page 89 and 90: 2 Policy Review 2.1 Planning Contex
Page 91 and 92: When the both the ‘Flood Zone’
Page 93 and 94: 3 Flood Risk to the Proposed Develo
Page 95 and 96: 3.2 Fluvial Flooding - Ordinary Wat
Page 97 and 98: Major earthworks affecting surface
Page 99 and 100: 3.7 Flooding from Infrastructure Fa
Page 101 and 102:
3.9 Summary of Risks to Site Table
Page 103 and 104:
4 Impacts of the Proposed Developme
Page 105 and 106:
4.6 Summary of Flood Impacts from D
Page 107 and 108:
5 Proposed Mitigation Measures 5.1
Page 109 and 110:
The extents of this problem are cur
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5.7 Summary of Recommended Mitigati
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6 Residual Risks The level of flood
Page 115 and 116:
7 PPS25 Sequential and Exception Te
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8 Conclusion The M1 Junction 19 Imp
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Appendix A Existing Layout, Environ
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Appendix B Contractor’s Proposals
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Appendix C Hydrogeological Assessme
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Memorandum Fairbairn House, Ashton
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Memorandum (Continued) Page 3 of 6
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Memorandum (Continued) Page 5 of 6
Page 141 and 142:
Appendix D Volume Distribution for
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Floodplain compensation area - elev
Page 145:
Depth Bands (m) TOTAL (m³) Area Re
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Chapter 9: Road drainage and the water environment

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