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Strategic Flood Risk Assessment

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Strategic Flood Risk Assessment Strategic Flood Risk Assessment Ipswich Borough Council Project number: 60612179 October 2020 Strategic Flood Risk Assessment Project number: 60612179 Quality information Prepared by Checked by Verified by Approved by Miguel Headley Joanna Bolding Emily Craven Amy Ruocco Graduate Engineer Senior Consultant Associate Senior Consultant Amy Ruocco Sarah Littlewood Emily Craven Sarah Littlewood Senior Consultant Senior Consultant Associate Principal Consultant Revision History Revision Revision date Details Authorized Name Position 1 October 2019 For stakeholder comment EC Emily Craven Associate 2 December 2019 For stakeholder comment EC Emily Craven Associate 3 January 2020 1st Issue EC Emily Craven Associate 4 March 2020 2nd Issue EC Emily Craven Associate 5 June 2020 3rd Issue EC Emily Craven Associate 6 September 2020 4th Issue EC Emily Craven Associate 7 October 2020 5th Issue EC Emily Craven Associate Distribution List # Hard Copies PDF Required Association / Company Name 0 1 Ipswich Borough Council Prepared for: Ipswich Borough Council Grafton House 15-17 Russell Road, Ipswich IP1 2DE United Kingdom Prepared by: AECOM Infrastructure & Environment UK Limited Midpoint, Alencon Link Basingstoke Hampshire RG21 7PP United Kingdom T: +44(0)1256 310200 aecom.com © 2020 AECOM Infrastructure & Environment UK Limited. All Rights Reserved. This document has been prepared by AECOM Infrastructure & 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: Ipswich Borough Council AECOM i Strategic Flood Risk Assessment Project number: 60612179 Table of Contents 1. Executive Summary ......................................................................................... 1 1.1 SFRA User Guide ....................................................................................................................... 2 2. Introduction ...................................................................................................... 3 2.1 Approach .................................................................................................................................... 3 2.2 Stakeholder Consultation ........................................................................................................... 4 2.3 Data Collection ........................................................................................................................... 6 2.4 Living Document ........................................................................................................................ 6 3. Sources of Flooding in Ipswich ........................................................................ 7 3.1 Overview .................................................................................................................................... 7 3.2 River Gipping ............................................................................................................................. 8 3.3 River Orwell ................................................................................................................................ 9 3.4 Belstead Brook .......................................................................................................................... 11 3.5 Mill River ................................................................................................................................... 11 3.6 Alderman Canal ........................................................................................................................ 11 3.7 Wet Dock ...................................................................................................................................12 3.8 Westerfield Watercourse ...........................................................................................................13 3.9 Other watercourses, springs, land drains ..................................................................................13 3.10 Sewerage System .....................................................................................................................13 3.11 Highway or Railway Drains .......................................................................................................14 3.12 SuDS and Soakaways ...............................................................................................................14 3.13 Surface water ............................................................................................................................15 3.14 Groundwater .............................................................................................................................16 3.15 Reservoirs .................................................................................................................................16 3.16 Summary ...................................................................................................................................16 4. Policy and Local Context ............................................................................... 17 4.1 Overview ...................................................................................................................................17 5. Assessment of Flood Risk ............................................................................. 21 5.1 Approach ...................................................................................................................................21 5.2 River Gipping ............................................................................................................................21 5.3 River Orwell ...............................................................................................................................23 5.4 Belstead Brook ..........................................................................................................................24 5.5 Mill River ...................................................................................................................................25 5.6 Westerfield Watercourse ...........................................................................................................26 5.7 Alderman Canal ........................................................................................................................26 5.8 Sewers and local drainage network...........................................................................................27 5.9 Surface water flooding ...............................................................................................................29 5.10 Groundwater flooding ................................................................................................................31 5.11 Reservoir Flooding ....................................................................................................................32 6. Assessment of Residual Tidal Flood Risk ...................................................... 33 6.1 Residual Risk ............................................................................................................................33 6.2 Modelling ...................................................................................................................................34 6.3 Speed of Onset and Duration ....................................................................................................47 7. Safety of development in Flood Zones 2 and 3 to inform the Exception Test 48 7.1 Introduction ...............................................................................................................................48 7.2 Specific local circumstances .....................................................................................................49 7.3 Recommendations for Safety Framework .................................................................................51 8. Applying the Exception Test - Assessment of site allocations ........................ 61 8.1 Overview ...................................................................................................................................61 Prepared for: Ipswich Borough Council AECOM ii Strategic Flood Risk Assessment Project number: 60612179 9. Flood risk management ................................................................................. 69 9.1 Overview ...................................................................................................................................69 9.2 Basements ................................................................................................................................69 9.3 Car Parks ..................................................................................................................................69 9.4 Riverside Development .............................................................................................................69 9.5 Development Layout and Sequential Approach ........................................................................70 9.6 Flood Warning and Alert ............................................................................................................70
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