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BROOK HOUSE, FLEET Initial Flood Risk Assessment Thakeham Homes BROOK HOUSE, FLEET Initial Flood Risk Assessment 33671-FRA-001 MARCH 2018 PUBLIC Thakeham Homes BROOK HOUSE, FLEET Initial Flood Risk Assessment TYPE OF DOCUMENT (VERSION) PUBLIC PROJECT NO. 70033671 OUR REF. NO. 33671-FRA-001 DATE: MARCH 2018 WSP QUALITY CONTROL Issue/revision First issue Revision 1 Revision 2 Revision 3 Revision 4 Remarks Draft for First Issue Red Line Draft Update Revision Comment Boundary for Comment Incorporating Updated Client Comments Date May 2017 June 2017 June 2017 March 2018 March 2018 Prepared by Simon King Simon King Simon King Simon King Simon King Signature Checked by Steven Brown Steven Brown Steven Brown Steven Brown Steven Brown Signature Authorised by Martin Martin Wheeler Martin Wheeler Martin Wheeler Martin Wheeler Wheeler Signature Project number 70033671 Report number 3671-FRA-001 File reference \\uk.wspgroup.com\central data\Projects\700336xx\70033671 - Brook House, Fleet- Hampshire\02 WIP\DE Development\03 Document\Reports\Water\Initial Flood Risk Assessment\180314-SEK-Initial Flood Risk Assessment v5.docx BROOK HOUSE, FLEET WSP Project No.: 70033671 | Our Ref No.: 33671-FRA-001 March 2018 Thakeham Homes CONTENTS 1 INTRODUCTION 4 1.1 APPOINTMENT AND BRIEF 4 1.2 AIM 4 1.3 OBJECTIVES 4 2 POLICY 5 2.1 NATIONAL POLICY 5 2.2 LOCAL POLICY 6 3 THE SITE 10 3.1 SITE LOCATION 10 3.2 SITE DESCRIPTION 10 3.3 TOPOGRAPHY 10 3.4 GEOLOGY AND HYDROGEOLOGY 10 3.5 EXISTING WATERCOURSES 11 3.6 FLOOD DEFENCES 11 3.7 EXISTING SEWER AND DRAINAGE INFRASTRUCTURE 11 3.8 HISTORIC FLOOD RECORDS 11 4 OVERVIEW OF FLOOD RISK 12 4.1 INTRODUCTION 12 4.2 EXISTING RISK OF FLOODING TO THE SITE 12 Flooding from Coastal and Tidal Sources 12 Flooding from Fluvial Sources 12 Flooding from Pluvial Sources 14 Flooding from Groundwater Sources 14 Flooding from Sewer and Drainage Infrastructure 15 Flooding from Artificial Sources 15 BROOK HOUSE, FLEET WSP Project No.: 70033671 | Our Ref No.: 33671-FRA-001 March 2018 Thakeham Homes Page 1 of 24 4.3 RISK OF FLOODING TO AND ARISING FROM THE PROPOSED DEVELOPMENT 16 Flooding from Coastal and Tidal Sources 16 Flooding from Fluvial and Pluvial Sources 16 Flooding from Groundwater Sources 17 Flooding from Sewers and Drainage Infrastructure 17 Flooding from Artificial Sources 17 4.4 SUMMARY OF FLOOD RISK 18 5 CONSULTATION 19 5.1 ENVIRONMENT AGENCY 19 6 SURFACE WATER DRAINAGE 20 6.1 EXISTING DRAINAGE REGIME 20 6.2 SURFACE WATER MANAGEMENT STRATEGY REQUIREMENTS 20 6.3 INDICATIVE SURFACE WATER DRAINAGE STRATEGY 20 7 CONCLUSIONS 22 TABLES Table 1 – Summary of Flood Risk 3 Table 2 - Summary of Flood Extents 14 Table 3 – Summary of Flood Risk to and from the Site/Proposed Development 18 Table 4 – Peak Greenfield Runoff Rates 20 Table 5 – Required Attenuation Volumes 21 APPENDICES Appendix A - Site Plans Appendix B - Proposed Development Plans Appendix C - Flood Risk Mapping Appendix D - Surface Water Drainage Calculations Appendix E - Hydraulic Modelling Study WSP BROOK HOUSE, FLEET March 2018 Project No.: 70033671 | Our Ref No.: 33671-FRA-001 Page 2 of 24 Thakeham Homes EXECUTIVE SUMMARY This report has been prepared in support of a proposed residential-led development of circa 500 dwellings, community facilities including a primary school, and 15 ha of Suitable Alternative Natural Greenspace (the ‘Proposed Development’) at a 45.6 ha agricultural site to the north of the M3 in Fleet, Hampshire (the ‘Site’) The Site is being submitted by Thakeham Homes to Hart District Council for Regulation 19 consultation of the Draft Hart Local Plan. This assessment has been undertaken in accordance with the criteria specified in the National Planning Policy Framework, the accompanying Flood Risk and Coastal Change Planning Practice Guidance and Local Planning Guidance. Existing flood risk posed to the Site and the Proposed Development from all potential sources has been assessed along with the potential of the Proposed Development to exacerbate these risks. Where risks have been identified suitable mitigation measures have been proposed. Part of the Site is considered to be subject to a High risk of fluvial and pluvial (i.e. surface water) flooding associated with the Ordinary Watercourse which runs through the Site. All other sources of flooding were assessed and found to range from Low to Negligible. Definitions of the grading criteria used are given in Paragraph 4.1.2 in the main body of this report. The Proposed Development adopts the sequential approach to spatial planning to locate all the residential and educational development within areas identified as having Very Low risk of fluvial flooding. The proposed strategy for the management of surface water will reduce the risk of flooding from surface water to the Proposed Development to Low. The Proposed Development would therefore have an annual probability of fluvial flooding of less than 0.1% and is consistent with the requirements by the NPPF with regards to flood risk. Consequently, the risk of flooding currently posed to the Site would not prohibit the Proposed Development from being successfully delivered. This report demonstrates that the Proposed Development can be delivered sustainably with regards to flood risk and surface water management and would be in accordance with both local and national policy. Table 1 – Summary of Flood Risk Sources of Flood Risk Current Risk to the Site Future Risk to the Future Risk from the Proposed Proposed Development Development Coastal and Tidal Negligible Negligible Negligible Fluvial High (4.7%), Moderate (4.4%) Very Low Very Low Low (6.5 %), Very Low (84.4%) Pluvial and Overland High to Low Low Very Low Flow Groundwater Low Low Very Low Drainage Infrastructure Very Low Very Low Very Low Artificial Sources Negligible Negligible Negligible BROOK HOUSE, FLEET WSP Project No.: 70033671 | Our Ref No.: 33671-FRA-001 March 2018 Thakeham Homes Page 3 of 24 1 INTRODUCTION 1.1 APPOINTMENT AND BRIEF 1.1.1. WSP was appointed by Thakeham Homes to produce a Preliminary Flood Risk Assessment in support of a proposed residential-led development of circa 500 dwellings, community facilities including a primary school, and 15 hectares (ha) of Suitable Alternative Natural Greenspace (the ‘Proposed Development’). An indicative plan of the Proposed Development is provided in Appendix B.1 (the ‘Masterplan’). 1.1.2. The Proposed Development is to be located at a 45.6 ha agricultural site to the north of the M3 in Fleet, Hampshire (the ‘Site’). 1.1.3. The Proposed Development is being submitted to Hart District Council (HDC) as the Local Planning Authority (LPA) for consideration as part of the Regulation 19 consultation of the Draft Hart Local Plan1 (the ‘Local Plan’). 1.2 AIM The aim of this document is to identify flood risks currently posed to the Site in accordance with the National Planning Policy Framework (NPPF)2 and those which may arise as a result of the Proposed Development in order to inform HDC’s consideration of the Site for inclusion within the Local Plan. 1.3 OBJECTIVES To achieve this aim the following objectives have been met: ¡ A desk study and data research including review of relevant local and national flood risk policies; ¡ A qualitative assessment of flood risk posed to the Site and the Proposed Development from all possible sources, including fluvial, pluvial, groundwater, sewers and man-made infrastructure; ¡ A hydrological assessment to predict river flows and rainfall intensities accounting for the anticipated effects of climate change; ¡ Development of a 1D-2D hydraulic model to enable a preliminary quantitative assessment of the flood risk posed to the Site; ¡ A walkover of the Site to visually verify critical flood flow routes, and to understand the local hydrological setting; ¡ An assessment of the impact of the Proposed Development on local flood risks; ¡ Estimation of surface water flows based on the current conditions at the Site and existing drainage systems; ¡ Estimation of pre and post development surface water flows based on the development proposals; ¡ Specification of mitigation measures to alleviate any unacceptable flood risks to and/or arising from the proposed Development; ¡ An assessment of the residual flood risk to the Proposed Development and neighbouring property from local flood sources; and, ¡ Production of a standalone Preliminary Flood Risk Assessment in accordance with the requirements of the NPPF and local policy. 1 Hart District Council (April 2017) Draft Hart Local Plan: Strategy and Sites 2016 – 2032, Proposed Submission Version; accessed March 2018 from https://www.hart.gov.uk/Local-Plan-Publication-2018 2 Department for Communities and Local Government (2012) National Planning Policy Framework; accessed March 2018 from https://www.gov.uk/guidance/national-planning-policy-framework WSP BROOK HOUSE, FLEET March 2018 Project No.: 70033671 | Our Ref No.: 33671-FRA-001 Page 4 of 24 Thakeham Homes 2 POLICY 2.1 NATIONAL POLICY National Planning Policy Framework 2.1.1. The NPPF states that ‘a site specific flood risk assessment is required for proposals of 1 hectare (ha) or greater in Flood Zone 1; all proposals for new development (including minor development and change of use) in Flood Zones 2 and 3, or in an area within Flood Zone 1 which has critical drainage problems (as notified to the local planning authority by the Environment Agency), and where Proposed Development or a change of use to a more vulnerable class may be subject to other sources of flooding’. 2.1.2. The Environment Agency’s Flood Map for Planning3 indicates that the Site is located within Flood Zones 1, 2 and 3. The Site covers an area of approximately 45.6 ha. 2.1.3. Consequently, a Flood Risk Assessment (FRA) would be required to support a planning application for the Proposed Development in order to ‘demonstrate that the Proposed Development will be safe for its lifetime taking account of the vulnerability of its users, without increasing flood risk elsewhere, and, where possible, will reduce flood risk overall’.
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