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Strategic Flood Risk Assessment - Level 1

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Strategic Flood Risk Assessment - Level 1 STRATEGIC FLOOD RISK ASSESSMENT - LEVEL 1 FOR LONDON BOROUGHS OF BARNET, BRENT, EALING, HARROW, HILLINGDON AND HOUNSLOW Prepared by: Mike Mair and Damon Reid- Date: April 2018 Williams Reviewed by: Michael Arthur Version: 1.4 Director: Simon Jones London Boroughs of Barnet, Brent, Ealing, Harrow, Hillingdon and Hounslow April 2018 Strategic Flood Risk Assessment - Level 1 Version No. 1.4 Version Date Details Prepared by Reviewed by Approved by Damon Reid- Minor corrections / revisions to 1.2 March 2018 Williams / Michael Arthur Michael Arthur website – Final Draft Mike Mair Revisions following review of Damon Reid- 1.3 April 2018 Michael Arthur Michael Arthur final draft Williams Final revisions following Damon Reid- 1.4 April 2018 agreement use of Flood Zones Michael Arthur Michael Arthur Williams 3a/b fo surface water Limitations Metis Consultants Limited (Metis) have prepared this Website (westlondonsfra.london) for the use of the West London Boroughs of Barnet, Brent, Ealing, Harrow, Hillingdon and Hounslow (hereinafter ‘the Client’). No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by Metis. The conclusions and recommendations contained in this Website are based upon information provided by others and upon the assumption that all relevant information has been provided by those parties from whom it has been requested and that such information is accurate. Information obtained by Metis has not been independently verified by Metis, unless otherwise stated in the Website. The work described in this Website is based on the conditions encountered and the information available during the period of production. The scope of this Website and the services are accordingly factually limited by these circumstances. Metis disclaim any undertaking or obligation to advise any person of any change in any matter affecting the Report, which may come or be brought to Metis’ attention after the date of the Website. Certain statements made in the Report that are not historical facts may constitute estimates, projections or other forward-looking statements and even though they are based on reasonable assumptions as of the date of the Website, such forward-looking statements by their nature involve risks and uncertainties that could cause actual results to differ materially from the results predicted. Metis specifically does not guarantee or warrant any estimate or projections contained in this Website. The Client should take appropriate professional legal advice prior to implementing any recommendations made within this Report Website may impact on the legal exposure of the Client. Copyright © This Report is the copyright of Metis Consultants Limited. Any unauthorised reproduction is strictly prohibited. Contact Details Metis Consultants Ltd. Spencer House 23 Sheen Road, Richmond London, TW9 1BN United Kingdom T: 020 8948 0249 E: [email protected] W: www.metisconsultants.co.uk ii London Boroughs of Barnet, Brent, Ealing, Harrow, Hillingdon and Hounslow April 2018 Strategic Flood Risk Assessment - Level 1 Version No. 1.4 Contents User Guide ................................................................................................................................... v Glossary ..................................................................................................................................... vii Acronyms and Abbreviations ........................................................................................................ x Executive Summary .................................................................................................................... xii 1. Introduction ........................................................................................................................ 1 1.1. Overview ................................................................................................................................................... 1 1.2. Objectives ................................................................................................................................................. 1 1.3. Document Structure ................................................................................................................................. 2 1.4. Local Plans ................................................................................................................................................ 3 1.5. Planning Application Considerations ........................................................................................................ 3 2. Planning and Policy Framework............................................................................................ 4 2.1. Overview ................................................................................................................................................... 4 2.2. Key Policies and Requirements ................................................................................................................ 4 3. Sources and Assessment of Flood Risk ................................................................................ 20 3.1. Overview ................................................................................................................................................. 20 3.2. Responsibilities ....................................................................................................................................... 20 3.3. Fluvial Flooding ....................................................................................................................................... 22 3.4. Tidal Flooding ......................................................................................................................................... 23 3.5. Surface Water and Ordinary Watercourse Flooding .............................................................................. 24 3.6. Groundwater Flooding ........................................................................................................................... 24 3.7. Sewer Flooding ....................................................................................................................................... 25 3.8. Artificial Sources Flooding ...................................................................................................................... 25 3.9. Historic Flooding ..................................................................................................................................... 26 3.10. Impacts of Climate Change – All Sources of Flood Risk ...................................................................... 26 3.11. Functional Floodplain ......................................................................................................................... 27 3.11.1 Definition................................................................................................................................................ 27 3.11.2 Interpretation - Approach ...................................................................................................................... 30 3.11.3 Interpretation - Examples .......................................................................... Error! Bookmark not defined. 4. Flood Risk Assessment Guidance ........................................................................................ 32 4.1. Overview ................................................................................................................................................. 32 4.2. Developer Guidance ............................................................................................................................... 47 4.2.1. Application of the Sequential and Exception Tests ............................................................................ 47 4.2.2. Sustainable Drainage Systems (SuDS) ................................................................................................ 49 4.2.3. Site-Specific Flood Risk Assessment (FRA) ......................................................................................... 50 4.2.4. Drainage Strategy ............................................................................................................................... 50 4.2.5. Flood Risk Management Structures and Features ............................................................................. 51 4.2.6. Borough-Specific Requirements ......................................................................................................... 51 4.3. Developer Management Guidance......................................................................................................... 55 4.3.1. Application of the Sequential and Exception Tests ............................................................................ 55 4.3.2. Sustainable Drainage Systems (SuDS) ................................................................................................ 56 4.3.3. Site-Specific FRAs ............................................................................................................................... 57 4.3.4. Drainage Strategy ............................................................................................................................... 57 4.3.5. Flood Risk Management Structures and Features ............................................................................. 58 4.3.6. Borough-Specific Requirements ........................................................................................................
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