Joint Strategic Flood Risk Assessment
Total Page:16
File Type:pdf, Size:1020Kb
Hinckley & Bosworth Borough Council Blaby District Council Oadby & Wigston Borough Council Joint Strategic Flood Risk Assessment Final Report October 2014 This page is intentionally left blank 2014s1272 Joint SFRA Final Report v1.0 Oct 2014).doc i JBA Project Manager Claire Gardner The Library St Philip’s Courtyard Church End COLESHILL B46 3AD Revision History Revision Ref / Amendments Issued to Date Issued • Sally Smith & Rachel Dexter (Hinckley & Bosworth Borough Council • Lucy O’Doherty (Blaby District Council • Kirstie Rea (Oadby & Wigston Borough Draft Report Council) Version 1.0 • (August 2014) Chris Clarke (Environment Agency – Lichfield Office) • Tim Andrews (Environment Agency – Nottingham Office) • Leicestershire County Council Updated following review by Hinckley & Bosworth • Sally Smith & Rachel Dexter (Hinckley & Final Draft Borough Council, Blaby Bosworth Borough Council Report Version District Council, Oadby & • Lucy O’Doherty (Blaby District Council 1.0 Wigston Borough • (September Council, Leicestershire Kirstie Rea (Oadby & Wigston Borough 2014) County Council and the Council) Environment Agency Small text amendments • Sally Smith & Rachel Dexter (Hinckley & Final Report based upon Hinckley & Bosworth Borough Council Version 1.0 Bosworth Borough • Lucy O’Doherty (Blaby District Council (October 2014) Council and Environment • Kirstie Rea (Oadby & Wigston Borough Agency comments Council) Contract This report describes work commissioned by Hinckley & Bosworth Borough Council, Blaby District Council, and Oadby & Wigston Borough Council. The Councils’ representative for the contract was Sally Smith of Hinckley & Bosworth Borough Council. Natasha Todd-Burley, Jaroslav Petrovskij and Claire Gardner of JBA Consulting carried out this work. Prepared by .................................................. Natasha Todd-Burley BSc PhD Senior Analyst Claire Gardner BSc MSc FRGS MCIWEM C.WEM Chartered Analyst Reviewed by ................................................. David Kearney BSc MSc MCIWEM C.WEM Principal Analyst 2014s1272 Joint SFRA Final Report v1.0 Oct 2014).doc ii Purpose This document has been prepared as a Final Report for Hinckley & Bosworth Borough Council, Blaby District Council, and Oadby & Wigston Borough Council. JBA Consulting accepts no responsibility or liability for any use that is made of this document other than by the Client for the purposes for which it was originally commissioned and prepared. JBA Consulting has no liability regarding the use of this report except to Hinckley & Bosworth Borough Council, Blaby District Council, and Oadby & Wigston Borough Council. 2014s1272 Joint SFRA Final Report v1.0 Oct 2014).doc 3 Acknowledgements We would like to acknowledge the assistance of Sally Smith and Rachel Dexter (Hinckley & Bosworth Borough Council), Lucy O’Doherty (Blaby District Council), Kirstie Rea and Jamie Carr (Oadby & Wigston Borough Council), Tim Andrews, Chris Clarke and Andrew Nickolls (Environment Agency), Dorothy Barratt (North Warwickshire Borough Council), Fabian D’Costa (Leicester City Council), Lesley Aspinall (Harborough District Council) and Lizzie Beresford (Rugby Borough Council). Copyright © Jeremy Benn Associates Limited 2014 Carbon Footprint A printed copy of the main text in this document will result in a carbon footprint of 627g if 100% post-consumer recycled paper is used and 798g if primary-source paper is used. These figures assume the report is printed in black and white on A4 paper and in duplex. JBA is aiming to reduce its per capita carbon emissions. 2014s1272 Joint SFRA Final Report v1.0 Oct 2014).doc 4 Bla62. unc1l Hinckley &Bosworth the heart of Leicestushire Borough Council This page is intentionally left blank 2014s1272 Joint SFRA Final Report v1 0 Oct 2014).doc 5 Executive Summary Introduction This updated version of the Joint Strategic Flood Risk Assessment (SFRA) 2014 replaces the document “Joint Strategic Flood Risk Assessment Final Report, November 2007”1 for the Councils of Hinckley & Bosworth Borough, Blaby District and Oadby & Wigston Borough (hereafter referred to as the joint SFRA area). The updated report has been prepared to replace the work that was included in the previous SFRA and provide appropriate supporting evidence for each Council’s Local Plan. The SFRA update will be used in decision making and to inform decisions on the location of future development and the preparation of sustainable policies for the long-term management of flood risk. Since the previous SFRA there have been a number of changes to the planning system, including the Localism Act (2011) and the National Planning Policy Framework (NPPF) (2012) with accompanying Planning Practice Guidance (March 2014). In addition, the provisions of the Flood and Water Management Act (2010) have been substantially commenced under a programme that was initiated by Defra in April 2010 and the Flood Risk Regulations came into force in December 2009 (these regulations transposed the EU ‘Floods Directive’ into UK law). The purpose of this SFRA update is to • provide information on the changes to planning, policy and guidance since the previous SFRA; • provide a detailed assessment of any flood hazard within the Flood Zones; • provide information on existing defences and flood risk management measures; • allow a sequential approach to site allocation to be undertaken within a flood zone; and • allow development of the policies and practices required to ensure that development in Flood Zones 2 and 3 satisfies the requirements of the Exception Test. SFRA objectives The Planning Practice Guidance advocates a tiered approach to risk assessment and identifies the following two levels of SFRA 1. Level One: where flooding is not a major issue and where development pressures are low. The Assessment should be sufficiently detailed to allow application of the Sequential Test 2. Level Two: where land outside Flood Zones 2 and 3 cannot appropriately accommodate all the necessary development creating the need to apply the NPPF’s Exception Test. In these circumstances the Assessment should consider the detailed nature of the flood characteristics within a flood zone. The objectives of this SFRA update are a hybrid of level one and level two. SFRA outputs This version of the SFRA delivers: Level one outputs • Maps showing the local planning authority area, Main Rivers, ordinary watercourses, and Flood Zones • An assessment of the implications of climate change for flood risk at assessment sites • Areas at risk from other sources of flooding, for example surface water or reservoir • Flood risk management measures, including location and standard of flood defences, flood warning coverage and emergency plans • Recommendations about the identification of critical drainage areas and the potential need for surface water management plans • Advice on the likely applicability of sustainable drainage systems for managing surface water runoff at key development sites 1 Joint Strategic Flood Risk Assessment (JBA Consulting, November 2007) 2014s1272 Joint SFRA Final Report v1.0 Oct 2014).doc vi • Advice on the preparation of flood risk assessments for development sites Level two outputs • An appraisal of current conditions of flood defence infrastructure • An appraisal of the probability and consequences of overtopping or failure of flood risk management infrastructure, including an allowance for climate change • Definition and mapping of the functional floodplain • Definition and mapping of o Flood depth o Flood velocity o Flood hazard • Maps showing the distribution of flood risk across all Flood Zones from all sources of flooding • Advice on appropriate policies for sites which could satisfy the first part of the Exception Test and on the requirements that would be necessary for a site-specific flood risk assessment supporting a planning application to pass the second part of the Exception Test • Advice on the preparation of site-specific flood risk assessments for sites of varying risk across the Flood Zones, including information about the use of sustainable drainage techniques • Recommendations to inform policy, development control and technical issues Summary • The Joint SFRA update has considered all sources of flooding, including fluvial, pluvial, groundwater, canal, reservoir and sewer flooding, within Hinckley & Bosworth Borough, Blaby District and Oadby & Wigston Borough. • An assessment of the flood defences in the joint SFRA area has been undertaken, including defence condition and standard and the residual risk. • Flood risk has been assessed for all supplied development options. • Guidance for the requirements for a site specific Flood Risk Assessment for these sites is provided (Appendix A), as well as general guidance on flood risk assessment for any development proposals within the joint SFRA area. • The updated Flood Map for Surface Water is provided, indicating the likelihood of surface water flooding in the joint SFRA area. • Surface water flooding is a risk in many of the areas. Advice has been provided regarding suitable SuDS options. • A broad scale assessment of the cumulative impact of development and cross-boundary issues has been undertaken. • Green Infrastructure within the joint SFRA area has been assessed and the Water Framework Directive (WFD) status of the joint SFRA area’s watercourses assessed. Recommendations Key recommendations • It is recommended that the mapping produced for this SFRA update is used in preference to the previous SFRA published in 2007. • It is recommended that