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 9.6.47 The increased highway area would result in a net increase in highway runoff. To ensure that there is no increase in runoff to the surface watercourses, a system of attenuation ponds has been designed. As described in Section 9.5 discharge rates would be equivalent to at least a 20% reduction for existing carriageways retained by the project. For new sections of highway run-off would be attenuated to a green field rate of 5 litres per second per hectare as agreed with the EA, less an additional allowance of 20% for climate change. 9.6.48 To mitigate against the risk of groundwater seepage in cuttings, filter drains and slope drainage would be used. 9.6.49 In summary, all flood risks associated with the junction improvement could be successfully managed. Implications for Planning Policies Regional Policy 9.6.50 Policy CC1 from the West Midlands Regional Spatial Strategy promotes the enhancement and extension of natural habitats, so that the opportunities for species migration are not precluded and biodiversity can adapt to climate change and hence help to mitigate its affects by absorbing flood water. This policy also requires all new development to minimise resource demand and encourage the efficient use of resources, especially water, avoid development in areas at risk of flooding and promote the use of sustainable drainage techniques. 9.6.51 Policy QE9 from the West Midlands Regional Spatial Strategy aims to protect or improve water quality and where necessary significantly reduce the risk of pollution, particularly regarding wetland species and habitats subject to local biodiversity partnerships. Where possible, the implementation of sustainable drainage systems should be considered. Development that poses an unacceptable risk to the quality of groundwater or surface water should therefore be avoided. The proposed development would accord with the Regional Policy objectives for the West Midlands where possible and would therefore have a Neutral/Beneficial Impact on these objectives. 9.6.52 Policies 32 and 35 from the East Midlands Regional Plan regarding Water Quality and Flood Risk, seek to promote improvements in water efficiency in new development, improve water quality, reduce the risk of pollution and flood risk. The most sustainable solutions should take account of climate change and use sustainable drainage techniques. 9.6.53 Development would not be permitted if, alone or in conjunction with other new development, it would be at unacceptable risk from flooding or create such an unacceptable risk elsewhere. However, adequate measures to mitigate negative effects, including provision for the maintenance and enhancement of biodiversity may be considered in accordance with the flood management regime for the region. As the proposed development would take drainage and sustainability into account where possible it would have a Neutral/Beneficial Impact on East Midlands Regional policy objectives. Local Policy 9.6.54 Strategic Objective 8 of the Joint Core Strategy for West Northamptonshire Issues and Options document aims to ensure that development is sensitive to its environment as it states that development should be locally distinctive and of a high quality design, using sustainable construction methods. B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 34
M1 JUNCTION 19 IMPROVEMENT ENVIRONMENTAL STATEMENT VOLUME 2 CHAPTER 9 – ROAD DRAINAGE AND THE WATER ENVIRONMENT 9.6.55 Potential Strategy ST1 from the Harborough District Core Spatial Strategy Final Draft Document states that all development must help mitigate and adapt to climate change; development in areas liable to be at risk of flooding will therefore be avoided. The promotion of sustainable drainage measures that do not compromise the function of watercourses and value of river corridors in providing natural floodplains is also promoted. 9.6.56 Policy GP10 from the Rugby Borough Local Plan regarding Flooding and Surface Water Drainage which states that Planning Permission will be granted for development that does not reduce the capacity of the floodplain to store water or otherwise exacerbate, or give rise to, the risk of flooding. Any necessary flood protection and mitigation measures, to ensure that the risk of flooding and damage to buildings and related areas is reduced to an acceptable level for the lifetime of the development, should be incorporated where possible. The use of mitigation measures is also promoted, including Sustainable Drainage Systems to provide for the disposal of surface water and provide for the re-use and recycling of such water within the development. 9.6.57 Policy GP11: Pollution Control from the Rugby Local Plan covers issues relating to drainage and the water environment, requires development proposals to show that there would not be any resulting pollution to surface or ground water. This is supported by Policy CS17 from the Rugby Borough Core Strategy Proposed Submission Draft document, regarding sustainable design and construction, which states that developments should be designed to reduce the use of non-renewable resources and take into account the impact of climate change over the lifetime of the development, through the implementation of methods such as Sustainable Drainage Systems. 9.6.58 Policy 13: General Sustainable Development Principles from the North Northamptonshire Core Strategy states that development should not cause a risk to (and where possible enhance) the quality of the underlying groundwater or surface water, nor increase the risk of flooding on the site or elsewhere, and where possible incorporate Sustainable Drainage Systems. 9.6.59 Overall, it is not considered that the proposed improvement to Junction 19 would negatively impact on Regional or Local policy principles and objectives, providing that sustainable measures such as Sustainable Drainage techniques and other mitigation measures to minimise the potential for pollution and flooding are implemented where possible throughout the scheme. B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 35
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
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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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