Corby Borough Council SFRA Main Report Final
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Corby Strategic Flood Risk Assessment Level 1 Main Report Northamptonshire County Council February 2019 Revision Schedule Corby Borough Level 1 Strategic Flood Risk Assessment Revision Date Details Prepared by Reviewed by Approved by 01 28th Draft SFRA Level Josie Phil Jones Alison Parry February 1 Main Report Bateman and 2018 Aiden Grist 02 1st May Draft SFRA Level Josie Phil Jones Alison Parry 2018 1 Main Report Bateman and version 2 Aiden Grist following partner consultation 03 4th June Final SFRA Level Josie Phil Jones Alison Parry 2018 1 Main Report Bateman and Aiden Grist 04 20th Updated Aiden Grist Phil Jones Alison Parry February Groundwater 2019 Mapping Northamptonshire County Council Place Directorate Flood and Water Management One Angel Square 4 Angel Street Northampton NN1 1ED Contents Executive Summary ................................................................................................................................. 7 Study Area ........................................................................................................................................... 8 1 Introduction .................................................................................................................................... 9 Applying the Sequential Test for Plan Making Purposes .................................................................... 9 Applying the Exception Test for Plan Making Purposes ................................................................... 10 Study Area ......................................................................................................................................... 11 Flood Risk Objectives ........................................................................................................................ 12 The Strategic Flood Risk Assessment Structure ................................................................................ 13 2 Methodology ................................................................................................................................. 14 Overview ........................................................................................................................................... 14 Tasks .................................................................................................................................................. 14 Stakeholders ..................................................................................................................................... 14 3 Data Collection and Review .......................................................................................................... 15 Overview ........................................................................................................................................... 15 Topography, Natural Landform and Geology ................................................................................... 15 River Welland ................................................................................................................................ 16 Harpers Brook ............................................................................................................................... 16 Gretton Brook ............................................................................................................................... 16 Willow Brook ................................................................................................................................. 16 GIS Layers .......................................................................................................................................... 17 Data Gaps and Assumptions ............................................................................................................. 17 4 Relevant Flood Risk Management Plans, Strategies and Studies ................................................. 18 National Flood and Coastal Erosion Management Strategy for England.......................................... 18 Preliminary Flood Risk Assessments ................................................................................................. 18 Flood Risk Management Plans and River Basin Management Plans ................................................ 19 Anglian Flood Risk Management Plan........................................................................................... 19 Northamptonshire Local Flood Risk Management Strategy and Action Plan ............................... 21 Flood and Water Related Work ........................................................................................................ 22 Corby Water Cycle Strategy. Phase 1 – Outline Strategy. Technical Report – September 2005 .. 22 Corby Water Cycle Strategy. Phase 2 – Detailed Strategy. Technical Report – November 2006 . 23 Corby Water Cycle Strategy Update: Corby Culvert Options Assessment – May 2012 ................ 23 North Northamptonshire Detailed Water Cycle Strategy – 2009 ................................................. 24 North Northamptonshire Flood Risk Management Study. Final Report – June 2007 .................. 24 North Northamptonshire Flood Risk Management Study Update – April 2012 ........................... 25 Corby Borough Council Strategic Flood Risk Assessments ........................................................... 25 Corby Flood Risk Management Plan 2015 .................................................................................... 26 5 Local Plans ..................................................................................................................................... 28 North Northamptonshire Joint Core Strategy (Local Plan Part 1) .................................................... 28 Policy 5 – Water Environment, Resources and Flood Risk Management ..................................... 29 Corby Part 2 Local Plan ..................................................................................................................... 29 North Northamptonshire Brownfield Land Assessment ................................................................... 30 Neighbourhood Planning .................................................................................................................. 30 6 Flood History ................................................................................................................................. 32 Main Rivers ....................................................................................................................................... 33 River Welland ................................................................................................................................ 33 Harpers Brook ............................................................................................................................... 33 Gretton Brook ............................................................................................................................... 33 Willow Brook (North, Central and Southern Arm) ........................................................................ 33 Flood Defence Infrastructure ............................................................................................................ 34 Gretton Brook ............................................................................................................................... 34 Harpers Brook ............................................................................................................................... 34 Willow Brook ................................................................................................................................. 34 Local Sources of Flood Risk ............................................................................................................... 35 Ordinary Watercourses ................................................................................................................. 35 Surface Water Flood Risk .............................................................................................................. 35 Water and Sewerage Systems ...................................................................................................... 35 Groundwater Flooding .................................................................................................................. 36 Reservoir Risk ................................................................................................................................ 37 7 Predicted Flood Risk ...................................................................................................................... 40 Surface Water Flooding .................................................................................................................... 40 General Drainage Issues .................................................................................................................... 41 Fluvial Flooding ................................................................................................................................. 41 Residual Flood Risk............................................................................................................................ 42 Groundwater Flooding ...................................................................................................................... 43 8 Site-Specific Information ..............................................................................................................