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 further guidance on the overall assessment of significance. Effects can be direct, indirect, secondary or cumulative, and can be permanent or temporary. Prediction also takes into account mitigation measures which have already been incorporated into the design, such as drainage design measures, or proposals for phasing parts of the development to restrict operations to a limited part of the year or day. Judgement may be made on the likelihood of an impact occurring. 9.2.8 Prediction of the magnitude of impacts should not be confused with evaluation of their significance. The significance of an effect is the product of the magnitude and the sensitivity / importance / quality of the environmental resource which is affected. B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 4
M1 JUNCTION 19 IMPROVEMENT ENVIRONMENTAL STATEMENT VOLUME 2 CHAPTER 9 – ROAD DRAINAGE AND THE WATER ENVIRONMENT Table 9.1: Estimating the Importance of Water Environmental Attributes (Reproduced from DMRB Volume 11, section 3, Part 10, table 5.3) 2 Importance Criteria Typical Examples Very High Attribute has a high quality and rarity on regional or national scale Surface Water: EC Salmonid/Cyprinid fishery; RQO River Ecosystem Class RE1 Site protected under EU or UK wildlife legislation (SAC, SPA, SSSI, Ramsar Site) Groundwater: Major aquifer providing a regionally important resource or supporting site protected under wildlife legislation; SPZ I Flood Risk: Flood Plain or defence protecting more than 100 residential properties from High Medium Low Notes : Attribute has a high quality and rarity on local scale Attribute has a medium quality and rarity on local scale Attribute has a low quality and rarity on local scale flooding Surface Water: RQO River Ecosystem Class RE2; Major Cyprinid Fishery; Species protected under EU or UK wildlife legislation Groundwater: Major aquifer providing locally important resource or supporting river ecosystem; SPZ II Flood Risk: Flood plain or defence protecting between 1 and 100 residential properties or industrial premises from flooding Surface Water: RQO River Ecosystem Class RE3 or RE4 Groundwater: Aquifer providing water for agricultural or industrial use with limited connection to surface water; SPZ III Flood Risk: Flood plain or defence protecting 10 or fewer industrial properties from flooding Surface Water: RQO River Ecosystem Class RE5 Groundwater: Non-aquifer Flood Risk: Floodplain with limited constraints and a low probability of flooding of residential and industrial properties EC : European Community Salmonid : Fish species including salmon and trout Cyprinid : A family of soft finned mainly freshwater fish including carp, tench, rudd and dace RQO : River Quality Objective, set by the EA RE : River Ecosystem, set by the EA EU : European Union SAC : Special Area of Conservation. European designated wildlife site. SPA : Special Protection Area. European designated wildlife site Ramsar : European designated wildlife site. SPZ : Source Protection Zone B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 5
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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