Kettering Strategic Flood Risk Assessment Level 1 Main Report Northamptonshire County Council August 2019 Revision Schedule Kettering Borough Level 1 Strategic Flood Risk Assessment 2019 Revision Date Details Prepared by Reviewed by Approved by 1st Draft for client 01 21/06/2019 Phil Jones Ruth Burnham Alison Parry consultation 2nd Draft for partner 02 09/07/2019 Phil Jones Ruth Burnham Alison Parry consultation 03 16/08/2019 Final for publication Phil Jones Ruth Burnham Alison Parry Northamptonshire County Council Flood and Water Management One Angel Square 4 Angel Street Northampton NN1 1ED Contents Executive Summary ................................................................................................................................. 6 1 Introduction .................................................................................................................................... 8 Applying the Sequential Test for Plan Making Purposes ........................................................................ 9 Applying the Exception Test for Plan Making Purposes ....................................................................... 10 Flood Risk Objectives ............................................................................................................................ 10 The Strategic Flood Risk Assessment Structure .................................................................................... 11 Study Area ............................................................................................................................................. 12 2 Methodology ................................................................................................................................. 13 Overview ............................................................................................................................................... 13 Tasks ...................................................................................................................................................... 13 Stakeholders ......................................................................................................................................... 13 Data Collection and Review .................................................................................................................. 13 Data Gaps and Assumptions ................................................................................................................. 14 3 Relevant Flood Risk Management Plans, Strategies and Studies ................................................. 16 National Flood and Coastal Erosion Management Strategy for England.............................................. 16 Preliminary Flood Risk Assessments ..................................................................................................... 16 Flood Risk Management Plans and River Basin Management Plans .................................................... 17 Flood and Water Related Work ............................................................................................................ 20 4 Local Plans ..................................................................................................................................... 27 North Northamptonshire Joint Core Strategy (Local Plan Part 1) ........................................................ 27 Kettering Part 2 Local Plan .................................................................................................................... 29 North Northamptonshire Brownfield Land Assessment ....................................................................... 30 Neighbourhood Planning ...................................................................................................................... 30 5 Understanding Flood Risk in Kettering Borough ........................................................................... 32 Historic Flooding ................................................................................................................................... 32 Topography, Natural Landform and Geology ....................................................................................... 34 Surface Water Flood Risk ...................................................................................................................... 35 Drainage and Sewerage Flood Risk ....................................................................................................... 37 Fluvial Flood Risk ................................................................................................................................... 38 Groundwater Flood Risk ....................................................................................................................... 39 Reservoir Flood Risk .............................................................................................................................. 41 Residual Flood Risk................................................................................................................................ 41 6 Site-Specific Information ............................................................................................................... 43 Further Site-Specific Requirements ...................................................................................................... 44 7 Flood Risk Management in Kettering Borough ............................................................................. 54 Existing Flood Defences and Assets ...................................................................................................... 54 Flood Warning and Hydrometric Stations ............................................................................................ 54 Emergency Planning and New Development........................................................................................ 56 Flood Resilience .................................................................................................................................... 56 Flood Resistance ................................................................................................................................... 57 Reducing Flood Risk through Site Layout and Design ........................................................................... 57 Modification of Ground Levels ............................................................................................................. 57 Buffer Strips .......................................................................................................................................... 58 Houses in Multiple Occupation ............................................................................................................. 58 Developer Contributions ....................................................................................................................... 58 8 Cumulative Impact of Development ............................................................................................. 60 Understanding Cumulative Impact ....................................................................................................... 60 Cumulative Impact of Development in Kettering Borough .................................................................. 60 SWMP Critical Drainage Catchments .................................................................................................... 61 Recommendations for Cumulative Impact ........................................................................................... 62 9 Sustainable Drainage Systems ...................................................................................................... 64 Statutory Consultee Role ...................................................................................................................... 64 Sustainable Drainage Systems .............................................................................................................. 64 General SuDS Advice for Developers in Northamptonshire ................................................................. 64 Local Standards and Guidance for Surface Water Drainage in Northamptonshire .............................. 64 Adoption of Drainage Systems and Water Company Guidance ........................................................... 64 Flood Data and Information Requests .................................................................................................. 65 Technical Flood Advice Services............................................................................................................ 65 10 Responsibility for Risk Management Authorities ......................................................................... 66 Overview ............................................................................................................................................... 66 The Environment Agency ...................................................................................................................... 66 Lead Local Flood Authority ................................................................................................................... 68 Water and Sewerage Companies .......................................................................................................... 71 Borough and District Councils ............................................................................................................... 71 Highway Authority ...............................................................................................................................