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 Table 9.2: Criteria for Determining Magnitude of Impact (Based on DMRB, Volume 11, section 3, Part 10, table 5.4) 2 Magnitude Criteria Example Major Adverse Loss of attribute and/or quality and integrity of attribute High risk of surface water pollution and potential failure of total zinc and dissolved copper, extensive change to a fishery or nature conservation site, loss of an aquifer or high risk of groundwater pollution, 100mm increase in flood Moderate Adverse Minor Adverse Negligible Minor Beneficial Moderate Beneficial Major Beneficial Effect on integrity of attribute or loss of part of attribute Measurable change in attribute’s quality or integrity Effects of insufficient magnitude to affect the attribute’s use or integrity Some beneficial effect or reduced risk of negative effect Moderate improvement to attribute quality Major improvement to attribute quality peak level (1% annual probability) High risk of surface water pollution and potential failure of either total zinc or dissolved copper, partial loss in productivity of a fishery, partial loss or change to an aquifer, medium risk of groundwater pollution, greater than 50mm increase in flood peak level (1% annual probability) High risk of surface water pollution but no change in total zinc and dissolved copper, low risk of pollution to groundwater, greater than 10mm increase in flood peak level (1% annual probability) Unlikely to affect the integrity of the water environment Table 9.3 Criteria for Estimating the Significance of Potential Effects (Based on DMRB Volume 11, section 3, Part 10, table 5.5) 2 Reduction in spillage risk by 50% or more (where existing risk is less than 1% per annum), greater than 10mm reduction in flood peak level (1% annual probability) Reduction in spillage risk by 50% or more (where existing risk is greater than 1% per annum), greater than 50mm reduction in flood peak level (1% annual probability) Removal of existing polluting discharge or of existing potential polluting discharge, recharge of an aquifer, greater than 100mm reduction in flood peak level (1% annual probability) Criteria for Estimating the Significance of Potential Effects Magnitude of Importance potential impact Very High High Medium Low Major VERY LARGE LARGE / VERY LARGE LARGE SLIGHT / MODERATE Moderate LARGE / VERY MODERATE / MODERATE SLIGHT LARGE LARGE Minor MODERATE / SLIGHT / SLIGHT NEUTRAL LARGE MODERATE Negligible NEUTRAL NEUTRAL NEUTRAL NEUTRAL B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 6
M1 JUNCTION 19 IMPROVEMENT ENVIRONMENTAL STATEMENT VOLUME 2 CHAPTER 9 – ROAD DRAINAGE AND THE WATER ENVIRONMENT 9.2.9 Significance should be assigned after consideration of proposed mitigation. In some cases, two alternatives are given for significance. In such cases, a reasoned judgement should be used to decide on a single description of significance. 9.2.10 Potential effects can either be beneficial or adverse. B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 7
Page 1: M1 Junction 19 Improvement Environm
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M1 JUNCTION 19 IMPROVEMENT ENVIRONM
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Appendix A - Pollution and Spillage
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Method D - Assessment of Pollution
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Groundwater: Hydrocarbons Hydrogeol
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Non Technical Summary Skanska Const
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Contents 1 Introduction 1 1.1 Overv
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1 Introduction 1.1 Overview Jacobs
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2 Policy Review 2.1 Planning Contex
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When the both the ‘Flood Zone’
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3 Flood Risk to the Proposed Develo
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3.2 Fluvial Flooding - Ordinary Wat
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Major earthworks affecting surface
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3.7 Flooding from Infrastructure Fa
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3.9 Summary of Risks to Site Table
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4 Impacts of the Proposed Developme
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4.6 Summary of Flood Impacts from D
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5 Proposed Mitigation Measures 5.1
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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
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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
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Appendix D Volume Distribution for
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Floodplain compensation area - elev
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Depth Bands (m) TOTAL (m³) Area Re
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Chapter 9: Road drainage and the water environment

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