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Wirral Strategic Flood Risk Assessment Wirral Council June 2009

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Wirral Strategic Flood Risk Assessment Wirral Council June 2009 Wirral Strategic Flood Risk Assessment Wirral Council June 2009 Prepared by: ................................................ Approved by: ................................................. Andrew Greenhalgh David Wells Engineer Regional Director Wirral Strategic Flood Risk Assessment Rev No Comments Date 1 Draft Issue 19/05/2008 2 Draft Issue 30/01/2009 3 Final Issue for Approval 04/02/2009 4 Final Issue following Council / EA Review 10/06/2009 38 Woodside Business Park, Birkenhead, Merseyside, CH41 1EL Telephone: 0151 647 2312 Fax: 0151 647 4742 Website: http://www.fabermaunsell.com 60041400 AG10274 June 2009 This document has been prepared by Faber Maunsell Limited (“Faber Maunsell”) for the sole use of our Wirral Council (the “Client”) and in accordance with generally accepted consultancy principles, the budget for fees and the terms of reference agreed between Faber Maunsell and the Client. Any information provided by third parties and referred to herein has not been checked or verified by Faber Maunsell, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of Faber Maunsell. Faber Maunsell Wirral Strategic Flood Risk Assessment 3 Table of Contents EXECUTIVE SUMMARY Introduction ....................................................................................................................... vii SFRA Structure and Methodology ................................................................................... vii Development and Flood Risk .......................................................................................... viii Data Collection ...................................................................................................................x Wirral SFRA Character Areas ............................................................................................x Conclusions and Recommendations ................................................................................ xi 1 Introduction ..................................................................................................................... 1 1.1 Background ........................................................................................................... 1 1.2 Report Structure and Methodology ....................................................................... 1 1.3 SFRA and the Planning Process .......................................................................... 2 1.4 Study Area ............................................................................................................ 3 2 Links Between Development Planning and Flood Risk Management ....................... 7 3 Planning Policy Framework ........................................................................................... 9 3.1 Introduction ........................................................................................................... 9 3.2 National Policy ...................................................................................................... 9 3.3 Regional Planning Policy .................................................................................... 10 3.4 Sub Regional Planning Policy ............................................................................. 10 3.5 Local Planning Policy .......................................................................................... 11 4 Flood Risk Management ............................................................................................... 13 4.1 Roles and Responsibilities within Flood Risk Management ............................... 13 4.2 Strategic Flood Risk Management Plans ........................................................... 15 4.3 Planning & Development Control ........................................................................ 17 4.4 Detailed Flood Risk Assessment (FRA) – The Developer.................................. 31 4.5 Climate change ................................................................................................... 31 4.6 Water Management – Background Information .................................................. 32 4.7 Flood Resistance and Flood Proofing Measures ................................................ 35 4.8 Civil Contingencies Act – Emergencies .............................................................. 35 5 Data Collection .............................................................................................................. 37 5.1 Overview ............................................................................................................. 37 5.2 Environment Agency Data .................................................................................. 37 5.3 Flood History ....................................................................................................... 38 5.4 Consultation ........................................................................................................ 38 5.5 SMP and CFMP Data ......................................................................................... 38 6 Flood Risk on Wirral ..................................................................................................... 41 6.1 Overview ............................................................................................................. 41 6.2 Historical Flooding .............................................................................................. 41 6.3 Flood Defences and Major Coastal Defences .................................................... 41 6.4 Current Fluvial Flood Risk .................................................................................. 47 6.5 Current Coastal / Tidal Flood Risk ...................................................................... 47 6.6 Local Sewer Flooding and Surface Water Issues ............................................... 48 6.7 Groundwater Flood Risk ..................................................................................... 48 6.8 Reservoirs / Impounded Water Bodies ............................................................... 49 6.9 Climate Change .................................................................................................. 49 6.10 Residual Risk of Flooding and Flood Hazard ..................................................... 50 6.11 Flood Incident Management / Emergency Planning ........................................... 51 7 Character Areas ............................................................................................................ 53 7.1 Overview ............................................................................................................. 53 7.2 Character Area 1 – Wallasey / New Brighton ..................................................... 55 7.3 Character Area 2 – Wirral Waters ....................................................................... 57 Faber Maunsell Wirral Strategic Flood Risk Assessment 4 7.4 Character Area 3 – Woodside / Docks ............................................................... 59 7.5 Character Area 4a – Bromborough / Eastham ................................................... 61 7.6 Character Area 4b – Bromborough / Eastham (river) ......................................... 62 7.7 Character Area 5a – Heswall / Gayton ............................................................... 63 7.8 Character Area 5b – Heswall / Pensby / Irby ...................................................... 63 7.9 Character Area 6 – Hoylake / West Kirby ........................................................... 64 7.10 Character Area 7 – Leasowe and the North Wirral Floodplains ......................... 66 7.11 Character Area 8a – Birkenhead / Tranmere / Bebington .................................. 68 7.12 Character Area 8b –Bidston / Noctorum / Prenton ............................................. 70 7.13 Character Area 9 – Upton / Woodchurch / Greasby / Moreton .......................... 70 7.14 Character Area 10 – Open Countryside / Greenbelt .......................................... 72 8 Conclusions and Recommendations .......................................................................... 75 8.1 Conclusion .......................................................................................................... 75 8.2 Recommendations .............................................................................................. 75 Abbreviations ............................................................................................................................. 79 Terms of Definition .......................................................................................................... 81 Glossary ..................................................................................................................................... 81 References ................................................................................................................................. 83 Appendix 1 – Pitt Review Recommendations ........................................................................ 87 Appendix 2 – Wallasey Embankment Breach Analysis ......................................................... 95 Appendix 3 – Character Areas ................................................................................................. 99 Appendix 4 – SFRA User Guide and Sample Flood Risk Assessment .............................. 101 Appendix 5 – Application of the Sequential and Exception Test ......................................
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