SAMPSON HOUSE PLANNING APPLICATION MAY 2018 FLOOD RISK ASSESSMENT SAMPSON HOUSE LIMITED TEAM CLIENT STRUCTURE ENGINEER TOWNSCAPE CONSULTANT SAMPSON HOUSE LIMITED AKT II TAVERNOR CONSULTANCY PLANNING CONSULTANT SERVICES ENGINEER VISUALISATION SERVICE DP9 SWECO MILLER HARE PROJECT MANAGER FIRE ENGINEER ENVIRONMENTAL CONSULTANT GARDINER & THEOBALD JGA FIRE ENGINEERING TRIUM ENVIRONMENTAL CONSULTING ARCHITECT FACADE ENGINEER PUBLIC RELATIONS PLP ARCHITECTURE / MAKE ARCHITECTS THORNTON TOMASETTI KANDA CONSULTING DAYLIGHT & SUNLIGHT CONSULTANT LANDSCAPE ARCHITECTS GORDON INGRAM ASSOCIATES GILLESPIES RESIDENTIAL AGENT TRANSPORT ENGINEER KNIGHT FRANK LLP WSP GROUP / CLEWLOW CONSULTING AFFORDABLE HOUSING CONSULTANT ACCESS CONSULTANT DS2 JANE SIMPSON ACCESS 3795 -Sampson House 1 1. Introduction 2 APPENDICES Contents Appendix A - London Borough of Southwark SFRA Maps 2. The Site 3 Appendix B - Thames Water Sewer Flooding Enquiry Appendix C - Site Investigation Extracts 3. Proposed Development 4 Appendix D - Environment Agency Flood Data 4. Requirements of National Planning Appendix E - Topographical Survey Policy Framework (NPPF) 5 4.1 Summary 5 5. Strategic Flood Risk Assessments 6 5.1 London Borough of Southwark SFRA 6 6. Sources of Flooding 7 6.1 Sequential Test 7 6.2 Exception Test 7 6.3 Flooding from Rivers and Sea 8 6.4 Flooding from Sewers 8 6.5 Flooding from Groundwater 8 6.6 Flooding from Artificial Sources 8 6.7 Flooding from Surface Water 9 6.7.1 Safe Access 10 7. Run-off Assessment 11 7.1 Existing Site Run-off 11 7.2 Proposed Site Run-off 11 7.3 Disposal Methods 12 8. Conclusions 11 P4 03.05.18 Post legal review P3 20.04.18 Issued for Planning P2 09.04.18 Environmental consultant comments added P1 21 12 2017 Preliminary Revision Date Status Prepared by: Mike Duff Checked by: David Purcell Approved by: Alex Hanna 3795 - Sampson House 2 AKT II have been commissioned to undertake a Flood Risk Assessment (FRA) in support of the 1. Introduction proposed redevelopment of the Sampson House site adjacent to Blackfriars Bridge in Central London. This report is intended to cover only flood risk and to provide the guidelines and parameters for the detailed drainage design. This study has been prepared in accordance with the guidance contained in the National Planning Policy Framework (NPPF) and the accompanying Planning Practice Guidance. This report should be read in conjunction with the AKT II drainage strategy report dated May 2018. 3795 - Sampson House 3 The site is located to the east of Blackfriars rail bridge on the 2. southern bank of the River Thames with postcode SE1 9JH. It is The Site enclosed by Southwark Street to the south, Hopton Street to the east and north and railway arches to the west. The National Grid reference for the site is 531762, 180425. Adjacent to the site, there is the Tate Modern gallery to the east and the southern entrance to Blackfriars Station to the north and west. The River Thames is located immediately to the north of the site. The site occupies an area of approximately 1.008ha. The surrounding topography has a very slight fall from west to east from a level of approximately 4.1m AOD to 3.9m AOD SITE along Southwark Street and a slight fall from the northern and southern boundaries to the centre of the site from a level of approximately 3.9m AOD to 3.65m AOD along Hopton Street. The site is roughly rectangular in plan and is approximately 210m long x 60m wide. The site location is shown in Figures 2.1 to 2.3 for information. Figure 2.1: Site Location Plan SITE Figure 2.2: Site Location Plan Figure 2.3: Site Location Plan .