Appendix A Norfolk Local Flood Risk Management Strategy Consultation Draft March 2015 1 Blank 2 Part One - Flooding and Flood Risk Management Contents PART ONE – FLOODING AND FLOOD RISK MANAGEMENT ..................... 5 1. Introduction ..................................................................................... 5 2 What Is Flooding? ........................................................................... 8 3. What is Flood Risk? ...................................................................... 10 4. What are the sources of flooding? ................................................ 13 5. Sources of Local Flood Risk ......................................................... 14 6. Sources of Strategic Flood Risk .................................................... 17 7. Flood Risk Management ............................................................... 19 8. Flood Risk Management Authorities ............................................. 22 PART TWO – FLOOD RISK IN NORFOLK .................................................. 30 9. Flood Risk in Norfolk ..................................................................... 30 Flood Risk in Your Area ................................................................ 39 10. Broadland District .......................................................................... 39 11. Breckland District .......................................................................... 45 12. Great Yarmouth Borough .............................................................. 51 13. Borough of King’s Lynn & West Norfolk ........................................ 60 14. North Norfolk District ..................................................................... 73 15. Norwich City .................................................................................. 81 16. South Norfolk District .................................................................... 89 17. Broads Authority Area ................................................................... 97 PART THREE – OBJECTIVES AND POLICIES ......................................... 103 18. Aim and Objectives ..................................................................... 103 19. Undertakings and commitments .................................................. 107 20. Ordinary Watercourse Regulation Policies .................................. 118 21. Wider Environmental Considerations .......................................... 124 22. Environmental Policies ................................................................ 127 23. SuDS Approving Body (SAB) ...................................................... 133 PART FOUR – MEASURES AND FUNDING .............................................. 134 24. Measures .................................................................................... 134 25. Funding ....................................................................................... 137 26. Monitoring and Review ................................................................ 143 Appendix 1: Measures ................................................................ 150 Appendix 2: Breakdown of Maintenance Expenditure by Risk Management Authorities ............................................................. 157 Appendix 3: Glossary .................................................................. 158 Appendix 4: Abbreviations .......................................................... 166 3 Part One - Flooding and Flood Risk Management Tables Table 1: Risk Management Authorities and their functions ................................. 24 Table 2: Responsibilities of Riparian Owners ..................................................... 28 Table 3: PFRA Priority Settlement Ranking, 2011 .............................................. 35 Table 4: Broadland District Settlement Ranking, 2011 ........................................ 41 Table 5: Breckland District Settlement Ranking, 2011 ........................................ 47 Table 6: Great Yarmouth Borough Area Settlement Ranking, 2011 ................... 53 Table 7: King’s Lynn and West Norfolk Settlement Ranking, 2011 ..................... 64 Table 8: North Norfolk Area Settlement Ranking, 2011 ...................................... 75 Table 9: South Norfolk Area Settlement Ranking, 2011 ...................................... 91 Table 10: Norfolk environmental projects that have the potential to influence local flood risk and drainage ............................................................................. 135 Table 11: Sources of funding ............................................................................ 137 Table 12: EA significance banding .................................................................... 144 Table 13: Monitoring and implementation regime ............................................. 146 Maps Map 1: Norfolk primary catchments and rivers ................................................. 31 Map 2: Map of Environment Agency Management Catchment Areas .............. 32 Map 3: Norfolk Internal Drainage Board boundaries ........................................ 33 Map 4: Map of Environment Agency Flood Zone 2 & 3 coverage of Norfolk .... 37 Map 5: Norfolk wide Preliminary Flood Risk Assessment map ........................ 38 Map 6: Rivers and catchment boundaries within the Broadland district area ... 44 Map 7: Rivers and catchment boundaries within the Breckland district area ... 50 Map 8: Rivers and catchment boundaries within the Great Yarmouth Borough area ....................................................................................... 58 Map 9: Critical Drainage Catchments within the Great Yarmouth Borough area ...................................................................................................... 59 Map 10: Map of the Fens area ........................................................................... 71 Map 11: Rivers and catchment boundaries within the King’s Lynn Borough area ...................................................................................................... 72 Map 12: Rivers and catchment boundaries within the North Norfolk District area ...................................................................................................... 80 Map 13: Rivers and catchment boundaries within the Norwich City Council area ...................................................................................................... 87 Map 14: Critical Drainage Catchments within the Norwich City and Broadland District areas ........................................................................................ 88 Map 15: Rivers and catchment boundaries within the South Norfolk District area ...................................................................................................... 96 4 Part One - Flooding and Flood Risk Management PART ONE – FLOODING AND FLOOD RISK MANAGEMENT 1. Introduction Background 1.1 In 2006 a torrential thunderstorm in the Great Yarmouth area flooded over 50 properties including 6 schools; more properties and businesses were flooded from Hemsby to Hopton on Sea and serious disruption was caused to a much wider area. The following year saw exceptional flooding across the UK, with 55,000 properties flooded and around 7,000 people rescued from the flood waters by the emergency services. 1.2 In response to these and other flood events the Government commissioned Sir Michael Pitt to undertake a review of the flooding. The resulting ‘Pitt Review’ recommended that; “the role of local authorities should be enhanced so that they take on responsibility for leading the co-ordination of flood risk management in their areas”. Legislative context 1.3 In response to the Pitt Review, the Flood and Water Management Act 2010 (FWMA) has introduced a new role of Lead Local Flood Authority (LLFA) which confers new statutory responsibilities on Local Authorities such as Norfolk County Council (NCC). 1.4 One of these new statutory duties is set out in Section 9 (1), FWMA which states that “a Lead Local Flood Authority for an area in England must develop, maintain, apply and monitor a strategy for local flood risk management in its area”. 1.5 The status of the Local Flood Risk Management Strategy is also indicated in the Flood and Water Management Act 2010. Section 11 states that an English Risk Management Authority must act in a manner which is “consistent” with the national strategy and guidance and (except in the case of a water company) act in a manner which is “consistent” with local strategies and guidance. A water company must “have regard” to local strategies and guidance. 5 Part One - Flooding and Flood Risk Management What is the strategy seeking to do? 1.6 The Local Flood Risk Management Strategy aims to inform all groups and individuals who may have an interest in, or an ability to influence or manage flood risks, including householders, businesses, landowners, developers and risk authorities. 1.7 The Local Flood Risk Management Strategy seeks to: • explain what flooding is, its dangers, and how flood risks can be managed; • inform about the extent and characteristics of flood risk in Norfolk and signpost other sources of information about flood risk in the county; • clarify which Risk Management Authorities1 are responsible for which flood risk management activities; • indicate the objectives of the strategy and make commitments in respect of the actions that will be taken by the Lead Local Flood Authority and other Risk Management Authorities; • establish a framework of policies