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Strategic Flood Risk Assessment Main Report

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Strategic Flood Risk Assessment Main Report Horsham Strategic Flood Risk Assessment Horsham District Council January 2020 Project number- 60613369 Horsham Strategic Flood Risk Assessment Horsham District Council Quality information Prepared by Checked by Verified by Approved by Joanna Bolding Sarah Littlewood Emily Craven Emily Craven Senior Hydrology Senior Flood Risk Associate Director Associate Director Consultant Consultant Hannah Booth Graduate Water Consultant Revision History Revision Revision date Details Authorized Name Position 01 22/11/2019 Draft for comment EC Emily Craven Associate Director 02 17/01/2020 Final report EC Emily Craven Associate Director Prepared for: Horsham District Council Prepared by: AECOM Infrastructure & Environment UK Limited Midpoint, Alencon Link Basingstoke Horsham 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. January 2020 AECOM ii Horsham Strategic Flood Risk Assessment Horsham District Council Table of Contents User Guide ................................................................................................................. ix Strategic Planning and Policy ............................................................................................................. ix Applying the Sequential Test ............................................................................................................... ix Emergency Planning ........................................................................................................................... x Preparing Site Specific FRAs ............................................................................................................... x Assessing Planning Applications .......................................................................................................... x Living Document ................................................................................................................................. x 1. Introduction .......................................................................................................... 1 1.1 Approach to Flood Risk Management ..................................................................................... 1 1.1.1 Assess flood risk ................................................................................................................... 1 1.1.2 Avoid flood risk ...................................................................................................................... 1 1.1.3 Manage and mitigate flood risk............................................................................................... 1 1.2 Purpose of a SFRA ................................................................................................................ 2 2. Study Area ........................................................................................................... 4 2.1 Local Planning Authority Area ................................................................................................ 4 2.2 Topography ........................................................................................................................... 5 2.3 Geology ................................................................................................................................ 5 2.4 Hydrogeology ........................................................................................................................ 5 2.5 Main Rivers ........................................................................................................................... 6 2.5.1 The River Arun & Tributaries .................................................................................................. 8 2.5.2 The River Adur & Tributaries .................................................................................................. 9 2.6 Tidal Influences ..................................................................................................................... 9 3. National and Local Policy ................................................................................... 10 3.1 Policy and Guidance Overview............................................................................................. 10 3.2 Climate Change Policy......................................................................................................... 11 3.2.1 Peak River Flow Climate Change Allowances ....................................................................... 11 3.2.2 Peak Rainfall Intensity Climate Change Allowance ................................................................ 12 3.2.3 Sea Level Allowance............................................................................................................ 12 4. Stakeholders and Consultation .......................................................................... 13 4.1 Responsibilities ................................................................................................................... 13 4.2 Consultation ........................................................................................................................ 14 5. Level 1 SFRA – Methodology ............................................................................ 16 5.1 Flooding from Rivers and Sea .............................................................................................. 16 5.1.1 Flood Map for Planning (Rivers and Sea) ............................................................................. 16 5.1.2 Functional Floodplain ........................................................................................................... 17 5.1.3 Flood Defences ................................................................................................................... 17 5.1.4 Climate Change................................................................................................................... 18 5.1.5 Hydraulic Modelling Studies ................................................................................................. 18 5.1.6 Historic Flooding .................................................................................................................. 19 5.1.7 Flood Warning Areas and Flood Alert Areas .......................................................................... 20 5.2 Flooding from Surface Water................................................................................................ 20 5.2.1 Risk of Flooding from Surface Water (RoFSW) ..................................................................... 20 5.2.2 Climate Change................................................................................................................... 20 5.3 Flooding from Sewers .......................................................................................................... 20 5.3.1 Historic Flooding .................................................................................................................. 21 5.4 Flooding from Groundwater.................................................................................................. 21 5.4.1 Areas Susceptible to Groundwater Flooding ......................................................................... 22 January 2020 AECOM iii Horsham Strategic Flood Risk Assessment Horsham District Council 5.4.2 Areas at Risk of Groundwater Flooding ................................................................................ 22 5.5 Flooding from Artificial Sources ............................................................................................ 23 6. Level 1 SFRA – Flood Risk Review ................................................................... 24 6.1 Tidal Flooding ...................................................................................................................... 24 6.1.1 Tidal flood defences ............................................................................................................. 24 6.2 Fluvial Flooding ................................................................................................................... 24 6.2.1 Flood Zones ........................................................................................................................ 24 6.2.2 Climate change ................................................................................................................... 24 6.2.3 Flood defences .................................................................................................................... 25 6.2.4 Flood Warning Areas ........................................................................................................... 25 6.3 Surface Water Flooding ....................................................................................................... 25 6.4 Groundwater Flooding ......................................................................................................... 26 6.5 Sewer Flooding ..................................................................................................................
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