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Level 1 Strategic Flood Risk Assessment

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Level 1 Strategic Flood Risk Assessment Final Report Submitted to Submitted by London Boroughs of Croydon, AECOM Merton, Sutton and Wandsworth Scott House Alençon Link Basingstoke Hampshire RG21 7PP United Kingdom Level 1 Strategic Flood Risk Assessment London Borough of Croydon London Borough of Merton London Borough of Sutton London Borough of Wandsworth AECOM Level 1 Strategic Flood Risk Assessment i Prepared by: Joanna Bolding Hydrology Consultant Sarah Littlewood Flood Risk Consultant Craig Boorman Assistant Hydrologist Checked by: Elizabeth Gent Principal Consultant Approved by: Carl Pelling Associate Director Rev No Comments Checked by Approved by Date 1 1st Draft report for client and stakeholder comment Elizabeth Gent Carl Pelling 02/07/2015 2 2nd Draft report for client and stakeholder comment Sarah Elizabeth Gent 10/11/2015 Littlewood 3 Final version Elizabeth Gent Elizabeth Gent 17/12/2015 Scott House, Alençon Link, Basingstoke, Hampshire, RG21 7PP, United Kingdom Telephone: 01256 310 200 Website: http://www.aecom.com Job No 47072816 December 2015 FINAL - 47072816 December 2015 AECOM Level 1 Strategic Flood Risk Assessment ii FINAL - 47072816 December 2015 AECOM Level 1 Strategic Flood Risk Assessment Page iii URS and AECOM On the 5th January 2015 URS officially became part of AECOM. Please note, whilst AECOM and URS have become one company, contracting entities (all of which are now wholly owned by AECOM) and lines of communication currently remain the same unless specifically agreed or communicated otherwise. Limitations AECOM Infrastructure & Environment UK Limited (“AECOM”) has prepared this Report for the sole use of the Client Group (London Borough of Croydon Council, London Borough of Merton Council, London Borough of Sutton Council and London Borough of Wandsworth Council) in accordance with the Agreement under which our services were performed (SFRA Tender Response 11-09-2014_rg_gh.pdf). No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by AECOM. This Report is confidential and may not be disclosed by the Client nor relied upon by any other party without the prior and express written agreement of AECOM. The conclusions and recommendations contained in this Report 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 AECOM has not been independently verified by AECOM, unless otherwise stated in the Report. The methodology adopted and the sources of information used by AECOM in providing its services are outlined in this Report. The work described in this Report was undertaken between October 2014 and November 2015 and is based on the conditions encountered and the information available during the said period of time. The scope of this Report and the services are accordingly factually limited by these circumstances. Where assessments of works or costs identified in this Report are made, such assessments are based upon the information available at the time and where appropriate are subject to further investigations or information which may become available. AECOM 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 AECOM’s attention after the date of the Report. 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 Report, such forward-looking statements by their nature involve risks and uncertainties that could cause actual results to differ materially from the results predicted. AECOM specifically does not guarantee or warrant any estimate or projections contained in this Report. Copyright © This Report is the copyright of London Borough of Croydon. Any unauthorised reproduction or usage by any person other than the addressee is strictly prohibited. FINAL - 47072816 December 2015 AECOM Level 1 Strategic Flood Risk Assessment Page iv Contents Executive Summary ............................................................................................................................................................. 1 1 Introduction ................................................................................................................................................................. 2 1.1 Terms of Reference .............................................................................................................................................. 2 1.2 Project Background .............................................................................................................................................. 2 1.3 Level 1 SFRA Deliverables .................................................................................................................................... 3 1.4 Study Area ............................................................................................................................................................ 4 1.4.1 Topography .................................................................................................................................................. 4 1.4.2 Hydrogeology ............................................................................................................................................... 4 1.4.3 Principal Watercourses ................................................................................................................................ 5 1.5 Partner Organisations ........................................................................................................................................... 6 2 Legislative and Planning Policy Context .................................................................................................................... 7 2.1 Introduction .......................................................................................................................................................... 7 2.2 Flood and Water Management Act ....................................................................................................................... 7 2.2.1 National Strategy for Flood and Coastal Erosion Risk Management ........................................................... 7 2.2.2 Local Flood Risk Management Strategy ...................................................................................................... 8 2.2.3 Surface Water Management Plans .............................................................................................................. 8 2.3 Flood Risk Regulations ......................................................................................................................................... 8 2.3.1 Preliminary Flood Risk Assessment ............................................................................................................. 8 2.3.2 Thames River Basin District Draft Flood Risk Management Plan ................................................................. 9 2.3.3 Thames Catchment Flood Management Plan .............................................................................................. 9 2.3.4 Thames Estuary 2100 .................................................................................................................................. 9 2.4 National Planning Policy Framework .................................................................................................................. 10 2.4.1 NPPF Guidance SuDS Policy (April 2015) .................................................................................................. 10 2.5 London Planning Policy ...................................................................................................................................... 10 2.5.1 The London Plan (March 2015) .................................................................................................................. 10 2.5.2 Sustainable Design and Construction SPG (April 2014) ............................................................................ 12 2.6 Local Planning Policy .......................................................................................................................................... 13 2.6.1 Croydon Local Planning Policy .................................................................................................................. 13 2.6.2 Merton Local Planning Policy ..................................................................................................................... 14 2.6.3 Sutton Local Planning Policy ...................................................................................................................... 18 2.6.4 Wandsworth Local Planning Policy ............................................................................................................ 20 2.7 River Wandle Catchment Plan ............................................................................................................................ 25 2.8 Summary ............................................................................................................................................................. 25 3 Level 1 SFRA Methodology ......................................................................................................................................
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