Wolverhampton Surface Water Management Plan
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Wolverhampton Surface Water Management Plan February 2012 Prepared for: Wolverhampton City Council UNITED KINGDOM & IRELAND WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN PHASE I, II & III – INTERIM DRAFT FEBRUARY, 2012 2 WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN REVISION SCHEDULE Rev Date Details Prepared by Reviewed by Approved by 1 February 2012 Interim Andrew Woodliffe Dr Neil Williams Jon Robinson Draft Principal Consultant Senior Consultant Technical Director URS Royal Court Basil Close Chesterfield Derbyshire S41 7SL Tel: 01246 244 744 Fax: 01246 209 229 www.ursglobal.com PHASE I, II & III – INTERIM DRAFT FEBRUARY, 2012 3 WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN PHASE I, II & III – INTERIM DRAFT FEBRUARY, 2012 4 WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN TABLE OF CONTENTS ACRONYMS AND ABBREVIATIONS................................................. 9 GLOSSARY ....................................................................................... 11 1 INTRODUCTION ............................................................. 13 PHASE I: PREPARATION................................................................. 15 2 IDENTIFY THE NEED FOR A SURFACE WATER MANAGEMENT PLAN.................................................... 17 2.1 Introduction .................................................................... 17 2.2 Stakeholder Engagement.............................................. 17 3 CLARIFY THE SCOPE FOR THE SWMP ...................... 21 3.1 Structure ......................................................................... 21 3.2 Aims and Objectives ..................................................... 21 4 FLOODING IN WOLVERHAMPTON .............................. 23 4.1 Surface Water Flooding in Wolverhampton................ 23 4.2 Future Flooding.............................................................. 25 4.3 Fragmented Responsibilities........................................ 26 4.4 Existing and Emerging Legislation.............................. 26 5 OVERVIEW OF DEVELOPMENT IN WOLVERHAMPTON ......................................................................................... 28 5.1 Core Strategy Status ..................................................... 28 6 ESTABLISH THE FLOOD RISK PARTNERSHIP .......... 30 6.1 Wolverhampton Flood Risk Partnership ..................... 30 6.2 Benefits of Collaborative Working............................... 31 6.3 Terms of Reference ....................................................... 32 7 DATA COLLECTION AND REVIEW .............................. 33 7.1 Data Collection............................................................... 33 7.2 Data Review.................................................................... 34 7.3 Linkages with Other Plans............................................ 34 7.4 Environment Agency Plans .......................................... 35 7.5 Wolverhampton Plans ................................................... 36 7.6 Multi-Agency Flood Plan............................................... 37 7.7 Severn Trent Water Plans ............................................. 37 PHASE II: RISK ASSESSMENT ....................................................... 40 8 PHASE II SCOPE............................................................ 42 8.1 Aims and Objectives ..................................................... 42 9 PLUVIAL FLOODING...................................................... 44 9.1 Overview ......................................................................... 44 9.2 Pluvial Flooding Data Review....................................... 44 10 LEVEL OF ASSESSMENT FOR WOLVERHAMPTON.. 50 10.1 Levels of SWMP Assessment....................................... 50 PHASE I, II & III – INTERIM DRAFT FEBRUARY, 2012 5 WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN 10.2 Selected Level of Assessment for Wolverhampton... 50 10.3 City-Wide Pluvial Modelling – Direct Rainfall ............. 51 10.4 Historical Flooding and Maintenance Records .......... 52 10.5 Hydrological Site Inspections ...................................... 56 11 SEWER FLOODING........................................................ 57 11.1 Overview ......................................................................... 57 11.2 Responsibility ................................................................ 57 11.3 Sewer Flooding Data Review........................................ 58 12 SMALL OPEN-CHANNEL AND CULVERTED WATERCOURSES.......................................................... 60 12.1 Overview ......................................................................... 60 12.2 Watercourse Data Review............................................. 60 13 GROUNDWATER ASSESSMENT.................................. 62 13.1 Overview ......................................................................... 62 13.2 Conclusions of Groundwater Flooding Susceptibility Assessment.................................................................... 62 13.3 Recommendations from Groundwater Flooding Susceptibility Assessment ........................................... 64 13.4 Further Recommendations ........................................... 64 14 CRITICAL DRAINAGE AREAS ...................................... 65 14.1 Overview ......................................................................... 65 14.2 Property Counts............................................................. 65 14.3 Risk to Existing Residential Properties....................... 65 14.4 CDA1 – Woodstock Road.............................................. 68 14.5 CDA2 - Corve Gardens .................................................. 70 14.6 CDA3 - Guy Avenue....................................................... 72 14.7 CDA4 – Wychall Drive, Blackbrook Way and Primrose Avenue ............................................................................ 74 14.8 CDA5 – Clark Road/Compton Road/Ross Avenue ..... 77 14.9 CDA6 - Bramstead Avenue/Grove Lane ...................... 83 14.10 CDA7 - Marnell Drive/Gail Park..................................... 88 14.11 CDA8 - Oxley Moor Road .............................................. 91 14.12 Risk to Future Development ......................................... 93 14.13 Communicate Risk....................................................... 100 PHASE III: OPTIONS....................................................................... 102 15 PHASE III: OPTIONS .................................................... 104 15.1 Objectives..................................................................... 104 15.2 Methodology................................................................. 104 15.3 Identify and Shortlist Options .................................... 109 PHASE I, II & III – INTERIM DRAFT FEBRUARY, 2012 6 WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN 15.4 Preferred Options ........................................................ 110 15.5 Recommendations for Next Steps and Quick Wins. 141 PHASE IV: IMPLEMENTATION AND REVIEW.............................. 144 PHASE I, II & III – INTERIM DRAFT FEBRUARY, 2012 7 WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN PHASE I, II & III – INTERIM DRAFT FEBRUARY, 2012 8 WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN ACRONYMS AND ABBREVIATIONS AAP Area Action Plan AEP Annual Exceedance Probability ASTSWF Areas Susceptible to Surface Water Flooding BGS British Geological Survey BW British Waterways CDA Critical Drainage Area CIRIA Construction Industry Research and Information Association CFMP Catchment Flood Management Plan CLG Department for Communities and Local Government Defra Department for Environment, Flood and Rural Affairs DEM Digital Elevation Model DMBC Dudley Metropolitan Borough Council DSM Digital Surface Model DTM Digital Terrain Model EA Environment Agency FMfSW Flood Map for Surface Water FRR Flood Risk Regulations FWMA Flood & Water Management Act GIS Geographical Information Systems HCA Homes and Communities Agency IUD Integrated Urban Drainage Study JCS Joint Core Strategy LDF Local Development Framework LiDAR Light Detection and Ranging LLFA Lead Local Flood Authority LPA Local Planning Authority LRF Local Resilience Forum NE Natural England NRD National Receptors Database PHASE I, II & III – INTERIM DRAFT FEBRUARY, 2012 9 WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN NR Network Rail OS Ordnance Survey PFRA Preliminary Flood Risk Assessment PPS25 Planning and Policy Statement 25: Development and Flood Risk RBMP River Basin Management Plan RFCC Regional Flood and Coastal Committee RSS Regional Spatial Strategy SAB SUDS Approval Body SFRA Strategic Flood Risk Assessment SMBC Sandwell Metropolitan Borough Council SPD Supplementary Planning Document ST Severn Trent Water SUDS Sustainable Drainage Systems SWMP Surface Water Management Plan UKCIP02 United Kingdom Climate Impact Programme 2002 WCC Wolverhampton City Council WFD Water Framework Directive WMBC Walsall Metropolitan Borough Council PHASE I, II & III – INTERIM DRAFT FEBRUARY, 2012 10 WOLVERHAMPTON SURFACE WATER MANAGEMENT PLAN GLOSSARY A source of groundwater comprising water bearing rock, sand or gravel capable of Aquifer yielding significant quantities of water. Asset A plan for managing water and sewerage company (WaSC) infrastructure and other Management assets in order to deliver an agreed standard of service. Plan Catchment Flood A high-level planning strategy through which the Environment Agency works with their Management key decision makers within a river catchment to identify and agree policies to secure the Plan long-term sustainable management of flood