London Borough of Enfield New Enfield Local Plan 2041: Level 1 Strategic Flood Risk Assessment _________________________________________________ Draft Report June 2021 New Enfield Local Plan 2041: Level 1 Strategic Flood Risk Assessment London Borough of Enfield Document Control Sheet Report Title Strategic Flood Risk Assessment Revision 1 Status Draft Control Date February 2021 Report Title Strategic Flood Risk Assessment Revision 1.1 Status Final Draft Control Date June 2021 Prepared by Graham Campbell & Jamie Kukadia Checked by Ian Russell & Ismail Mulla London Borough of Enfield B-Block North, Civic Centre, Silver Street, Enfield, EN1 3XA Email
[email protected] i New Enfield Local Plan 2041: Level 1 Strategic Flood Risk Assessment London Borough of Enfield CONTENTS PAGE LIST OF TABLES AND FIGURES v SFRA USER GUIDANCE vii EXECUTIVE SUMMARY x 1.0 INTRODUCTION 1 Aims and Objectives 1 Policy Context 4 2.0 FLOOD RISK IN ENFIELD 11 Geography of Enfield 11 Catchment Areas of Main Rivers in Enfield 13 Sources of Flooding 16 History of Flooding in Enfield 18 3.0 STRATEGIC ASSESSMENT OF FLOOD RISK 19 General Methodology 19 Data Collation and Review 19 Fluvial Flooding 20 Groundwater Flooding 27 Surface Water Flooding 30 Sewer Flooding 34 Reservoirs 36 The New River 38 Effects of Climate Change 39 4.0 FLOOD RISK MANAGEMENT INFRASTRUCTURE 41 Flood Defences 41 Flood Alleviation Schemes 43 Catchment Based Approach 45 Flood Warning Systems 47 Emergency Planning 48 ii New Enfield Local Plan 2041: Level 1 Strategic Flood Risk Assessment London