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 Harborough District Council Local Plan (2001) 30 9.3.8 The Harborough District Local Plan was adopted in 2001 and all policies that were not formally saved expired in September 2007. There are no saved policies which relate to drainage and the water environment. 9.3.9 Harborough are in the process of producing their Core Strategy which is currently at the Final Draft stage. Within this document (2009), Potential Strategy ST1 states that all development must help mitigate and adapt to climate change and that development in areas liable to be at risk of flooding will therefore be avoided. Rugby Borough Council Local Plan (2006) 31 9.3.10 The Rugby Borough Local Plan was adopted in 2006 and contains a number of saved policies. Policies GP10: Flooding and Surface Water Drainage and GP11: Pollution Control of the local plan cover issues relating to drainage and the water environment. Policy GP10 aims to ensure that development does not increase the risk of flooding and that all developments should incorporate sustainable drainage systems. Policy GP11 requires development proposals to show that there would not be any resulting pollution to surface or ground water. 9.3.11 In addition to the saved policies in the Local Plan, the emerging Core Strategy for Rugby is currently at the Proposed Submission Draft Stage. Within the Draft Submission Core Strategy Document (2009), there are no specific policies which relate to drainage or the water environment. North Northamptonshire Core Strategy (2008) 32 9.3.12 The North Northamptonshire Core Strategy was adopted in 2008 and is a joint Core Strategy covering the areas of Corby, Kettering, Wellingborough and East Northamptonshire. Within this document Policy 13: General Sustainable Development Principles covers issues relating to the protection of ground water and surface water from pollution, as well as ensuring that the development does not increase flood risk. In addition to these requirements it also states that development should incorporate sustainable drainage systems. B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 12
M1 JUNCTION 19 IMPROVEMENT ENVIRONMENTAL STATEMENT VOLUME 2 CHAPTER 9 – ROAD DRAINAGE AND THE WATER ENVIRONMENT 9.4 BASELINE CONDITIONS Surface Water 9.4.1 The existing distribution of surface waters in the area is shown on Figure 9.1. Junction 19 of the M1 lies within the upper catchment of the River Avon. The River Avon flows in a broadly south-westerly direction; it is crossed by the eastern extent of the A14 Trunk Road within the study area, and is also crossed further downstream by the southern extent of the M1 within the study area. 9.4.2 There are a number of tributaries in the vicinity of the junction which predominantly flow southwards / south-westwards / south-eastwards to the River Avon. These include the Swinford Lodge Brook, which is located to the north east of the junction and flows beneath the eastern extent of the A14 Trunk Road. Another tributary, the Clay Coton Yelvertoft Brook, is located to the south east of the junction and flows westwards, converging with the River Avon adjacent to and east of the M1. 9.4.3 The River Avon and Clay Coton Yelvertoft Brook are classified as ‘main’ rivers. All others are ‘ordinary’ watercourses. 9.4.4 A network of drains and ditches currently collects highway runoff from the M1, M6 and A14 Trunk Road, which is then discharged at some 11 locations to the adjacent watercourses (as shown on Figure 9.2). Summary details of the drainage areas or ‘zones’ and their discharge points to the receiving watercourses are shown in Table 9.6 below. The areas quoted in the table are those within the limits of the scheme as illustrated on Figure 9.2. The drainage of highways outside the scheme limits as noted on Figure 9.2 has not been included in the assessment. In some areas, land and highway drainage are combined prior to discharge, which is sometimes direct, to the various receiving watercourses. Water courses are currently culverted at three locations within the scheme area, beneath the M1, M6 and A14 Trunk Road. There are two bridges over the River Avon. Table 9.6 Summary Details of Existing Highway Drainage Drainage Highway Sections Area Receiving Water Course Zone (m 2 ) 1 Northern extent of M1 8209 Tributary of Swinford Lodge Brook 2 Majority section of M1 54064 Swinford Lodge Brook between Zone 1 and north of interchange including various slip roads 3 M1 south of Zone 2 extending 61383 River Avon southwards to just north of River Avon 4 South of Zone 3, section of 8753 River Avon M1 over River Avon 5 South of Zone 4, comprising 20800 Clay Coton Yelvertoft Brook most of remaining southern extent of M1 6 Mostly westbound section M6, west of interchange including various slip roads, between Zones 1, 3 and 9 32421 Tributary of River Avon (name unknown) B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 13
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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