River Hull Advisory Board River Hull Integrated Catchment Strategy April 2015 Strategy Document Draft report This Page is intentionally left blank 2 Inner Leaf TITLE PAGE 3 This page is intentionally left blank 4 Contents 1 This Document.............................................................................................................................17 2 Executive Summary ..............................................................................................................18 3 Introduction and background to the strategy ..................................20 3.1 Project Summary .................................................................................................................................... 20 3.2 Strategy Vision ........................................................................................................................................ 20 3.2.1 Links to other policies and strategies .......................................................................................21 3.3 Background .............................................................................................................................................. 22 3.3.1 Location ........................................................................................................................................... 22 3.3.2 Key characteristics and issues of the River Hull catchment ...............................................22 3.3.3 EA Draft River Hull Flood Risk Management Strategy .........................................................26 3.3.4 Multi-agency strategic approach ................................................................................................ 27 3.4 Objectives ................................................................................................................................................ 28 3.5 Governance.............................................................................................................................................. 28 3.6 The study rationale ................................................................................................................................ 31 3.7 Strategy development approach ......................................................................................................... 33 3.7.1 Option 1: Do nothing, maintain existing assets .....................................................................33 3.7.2 Option 2: Adopt the EA River Hull Strategy ..........................................................................34 3.7.3 Option 3: Review the EA River Hull Strategy ........................................................................34 3.7.4 Option 4: Develop an Integrated Catchment Strategy ........................................................35 3.7.5 Preferred option ............................................................................................................................ 36 3.8 Study plan and strategy development ................................................................................................ 36 3.8.1 Strategy Procurement .................................................................................................................. 37 3.8.2 Hydraulic modelling ...................................................................................................................... 37 3.8.3 Baseline understanding ................................................................................................................. 37 3.8.4 Economic appraisal ....................................................................................................................... 38 3.8.5 Strategy development ...................................................................................................................38 3.8.6 Strategic environmental assessment .........................................................................................38 3.8.7 Management strategy documentation ......................................................................................39 3.8.8 Risks to delivery ............................................................................................................................ 39 4 Catchment overview............................................................................................................41 4.1 The River Hull catchment and definition of the study area .........................................................41 4.1.1 The study area ............................................................................................................................... 41 5 4.1.2 Topography ..................................................................................................................................... 42 4.1.3 Geology and Hydrogeology ........................................................................................................ 44 4.1.4 The river system ............................................................................................................................45 4.2 Environmental context .......................................................................................................................... 48 4.2.1 Strategic Environmental Assessment ........................................................................................49 4.2.2 People and property..................................................................................................................... 49 4.2.3 Land use and landscape ................................................................................................................ 49 4.2.4 Recreation and amenity ............................................................................................................... 50 4.2.5 Material assets ................................................................................................................................ 50 4.2.6 Natural environment .................................................................................................................... 50 4.2.7 Fisheries........................................................................................................................................... 51 4.2.8 Cultural heritage ............................................................................................................................ 52 4.2.9 Water............................................................................................................................................... 53 4.3 Other relevant plans and strategies ................................................................................................... 53 4.3.1 Hull and coastal streams catchment flood management plan (CFMP) .............................55 4.3.2 Haltemprice Flood Risk Management Plan ..............................................................................56 4.3.3 Other plans..................................................................................................................................... 56 4.3.4 Planning and development ...........................................................................................................58 4.3.5 Environmental issues .................................................................................................................... 60 5 Flood risk............................................................................................................................................... 62 5.1 Definitions................................................................................................................................................ 62 5.1.1 Flood risk and probability ............................................................................................................62 5.2 Causes of flooding .................................................................................................................................. 62 5.2.1 Flooding processes ........................................................................................................................62 5.3 Flood management in the River Hull catchment ............................................................................66 5.3.1 Responsibilities for flood management ....................................................................................66 5.3.2 The role of the Regional Flood and Coastal Committees ..................................................67 5.3.3 Environment Agency .................................................................................................................... 67 5.3.4 Lead local flood authorities (LLFAs) .........................................................................................68 5.3.5 Legal responsibilities for the River Hull ...................................................................................69 5.3.6 Flood defences............................................................................................................................... 70 5.4 Assessment of current flood risk ....................................................................................................... 71 5.5 Flood risk in the future ......................................................................................................................... 74 5.5.1 Climate change............................................................................................................................... 74 6 5.5.2 New Development