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Strategic Flood Risk Assessment Spelthorne Borough Council Strategic Flood Risk Assessment Spelthorne Borough Council Project number: 60559796 Draft February 2018 DRAFT Spelthorne Borough Council DRAFT Project number: 60559796 Quality information Prepared by Checked by Approved by Fraser O’Halloran Sarah Littlewood Sarah Kelly Graduate Consultant Senior Consultant Regional Director Revision History Revision Revision date Details Authorized Name Position 1 Feb 2018 Draft for Client Comment 14/02/2018 Sarah Kelly Regional Director Distribution List # Hard Copies PDF Required Association / Company Name Prepared for: Spelthorne Borough Council Prepared by: AECOM Infrastructure and Environment UK Limited Midpoint, Alencon Link Basingstoke Hampshire RG21 7PP United Kingdom T: +44(0)1256 310200 aecom.com © 2018 AECOM Infrastructure and Environment UK Limited. All Rights Reserved. This document has been prepared by AECOM Infrastructure and Environment UK Limited (“AECOM”) for sole use of our client (the “Client”) in accordance with generally accepted consultancy principles, the budget for fees and the terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. Prepared for: Spelthorne Borough Council AECOM Spelthorne Borough Council DRAFT Project number: 60559796 Table of Contents Abbreviations ...................................................................................................................................................5 Glossary of Terms .............................................................................................................................................6 Executive Summary ..........................................................................................................................................8 1 Introduction and User Guide ............................................................................ 9 1.1 Introduction .........................................................................................................................................9 1.2 Approach to Flood Risk Management ..................................................................................................9 1.3 Purpose of the SFRA ........................................................................................................................ 11 1.4 Flood Risk Policy and Guidance ........................................................................................................ 11 1.5 User Guide .......................................................................................................................................12 1.6 Living Document ...............................................................................................................................13 2 Methodology .................................................................................................. 14 2.1 Consultation ......................................................................................................................................14 2.2 Data Collection and Mapping .............................................................................................................15 3 Strategic Assessment of Flood Risk .............................................................. 16 3.1 Overview ..........................................................................................................................................16 3.2 Flooding From Rivers ........................................................................................................................18 3.3 Flooding From Surface Water ............................................................................................................25 3.4 Flooding From Groundwater ..............................................................................................................27 3.5 Flooding From Sewers ......................................................................................................................29 3.6 Flooding From Artificial Sources.........................................................................................................30 4 Avoiding Flood Risk – Applying the Sequential and Exception Tests ............. 32 4.1 Overview ..........................................................................................................................................32 4.2 Applying the Sequential Test for the Local Plan ..................................................................................32 4.3 Applying the Sequential Test for Planning Applications .......................................................................35 4.4 Exception Test...................................................................................................................................36 5 Managing and Mitigating Flood Risk.............................................................. 38 5.1 Overview ..........................................................................................................................................38 5.2 Development Layout and Sequential Approach ..................................................................................38 5.3 Finished Floor Levels ........................................................................................................................38 5.4 Flood Resistance ‘Water Exclusion Strategy’ ......................................................................................39 5.5 Flood Resilience ‘Water Entry Strategy’ .............................................................................................41 5.6 Safe Access and Egress ....................................................................................................................41 5.7 Flood Compensation Storage ............................................................................................................42 5.8 Flood Routing ...................................................................................................................................44 5.9 Riverside Development .....................................................................................................................44 5.10 Surface Water Management ..............................................................................................................45 5.11 Flood Warning and Evacuation Plans................................................................................................. 48 5.12 Flood Warning Areas .........................................................................................................................49 6 Preparing Site Specific FRAs ........................................................................ 51 6.1 What is a Flood Risk Assessment? ....................................................................................................51 6.2 When is a Flood Risk Assessment required? ......................................................................................51 6.3 How detailed should a FRA be? .........................................................................................................51 6.4 What needs to be addressed in a Flood Risk Assessment? ................................................................53 6.5 Flood Risk Assessment Checklist ......................................................................................................53 6.6 Pre-application Advice .......................................................................................................................56 Appendix A Data Register ........................................................................................ 57 Appendix B Figures .................................................................................................. 58 Prepared for: Spelthorne Borough Council AECOM Spelthorne Borough Council DRAFT Project number: 60559796 Appendix C Surface Water Conditions Report ......................................................... 59 Figures Figure 1-1 Taking flood risk into account in the preparation of a Local Plan (Planning Practice Guidance for Flood Risk and Coastal Change) ..............................................................................................................................10 Figure 4-1 Application of Sequential Test for Local Plan preparation (Planning and Practice Guidance for Flood Risk and Coastal Change) ..............................................................................................................................32 Figure 5-1 Flood Resistant / Resilient Design Strategies, Improving Flood Performance, CLG 2007 ..................40 Figure 5-2 Example of Floodplain Compensation Storage (Environment Agency 2009) .....................................43 Tables Table 1-1 Flood Risk Policy and Guidance Documents ..................................................................................... 11 Table 2-1 SFRA Stakeholder Organisations and Roles .....................................................................................14 Table 3-1 Fluvial Flood Zones (extracted from the PPG, 2014) .........................................................................18 Table 3-2 Peak river flow allowances for Thames river basin district (use 1961 to 1990 baseline) ......................20 Table
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