West Devon Level 1 Strategic Flood Risk Assessment Revised December 2014 Level 1 Strategic Flood Risk Assessment West Devon Borough Council & Part of DNPA Contents Glossary ...................................................................................................................... 14 1 Introduction ......................................................................................................... 17 1.1 Background ........................................................................................................................... 17 1.2 Strategic Flood Risk Assessment (SFRA) Approach ............................................................... 17 1.3 Planning Context ................................................................................................................... 19 1.4 Study Area ............................................................................................................................. 19 1.5 West Devon Borough Council Area ....................................................................................... 19 1.6 Dartmoor National Park Area ............................................................................................... 20 1.7 Aims and Objectives of the SFRA Update ............................................................................. 20 2 Policy Context ...................................................................................................... 21 2.1 National Policy ...................................................................................................................... 21 2.2 The Flood and Water Management Act (2010) .................................................................... 22 2.3 Consultation on delivering Sustainable Drainage Systems ................................................... 23 2.4 House of Commons: Written Statement (HCWS161) ........................................................... 23 2.5 National Planning Policy Framework (2012) ......................................................................... 24 2.6 National Flood and Coastal Erosion Risk Management Strategy (FCERM) ........................... 25 2.7 Catchment Flood Management Plans (CFMP) ...................................................................... 25 2.8 River Basin Management Plans (RBMP) ............................................................................... 27 2.9 Shoreline Management Plan (SMP) ...................................................................................... 27 2.10 Devon County Council Prefeasibility Flood Risk Assessment (PFRA) .................................... 27 2.11 Local Flood Risk Management Strategy (LFMS) .................................................................... 28 2.12 Emergency Planning .............................................................................................................. 28 3 Data Collection and Review .................................................................................. 28 3.1 Tasks ...................................................................................................................................... 28 3.2 Stakeholder Consultation ...................................................................................................... 28 3.3 Data/Information Requested ................................................................................................ 29 4 Level 1 Strategic Flood Risk Assessment Data ....................................................... 29 4.1 Requirements of National Planning Policy Framework (NPPF) ............................................ 29 4.2 Climate Change ..................................................................................................................... 29 4.3 Tidal Flooding ........................................................................................................................ 30 4.4 Fluvial Flooding ..................................................................................................................... 30 4.5 Flood Defences ...................................................................................................................... 31 4.6 Flood Warning Areas ............................................................................................................. 32 2 Level 1 Strategic Flood Risk Assessment West Devon Borough Council & Part of DNPA 4.7 Surface Water Flooding ........................................................................................................ 32 4.8 Groundwater Flooding .......................................................................................................... 32 4.9 Sewer Flooding ...................................................................................................................... 33 4.10 Artificial Sources ................................................................................................................... 33 4.11 Reservoirs .............................................................................................................................. 34 4.12 Lakes...................................................................................................................................... 34 4.13 Tavistock Canal ...................................................................................................................... 34 4.14 Leats ...................................................................................................................................... 34 5 West Devon Strategic Flood Risk Assessment ....................................................... 34 5.1 Study Area Flood Sources ..................................................................................................... 35 5.2 Fluvial Flood Sources ............................................................................................................. 35 5.2.1 River Dart .......................................................................................................................... 35 5.2.2 River Lew ........................................................................................................................... 35 5.2.3 River Lyd ............................................................................................................................ 36 5.2.4 River Meavy ...................................................................................................................... 36 5.2.5 River Tamar ....................................................................................................................... 36 5.2.6 River Tavy .......................................................................................................................... 36 5.2.7 River Taw ........................................................................................................................... 36 5.2.8 River Okement .................................................................................................................. 36 5.2.9 River Walkham .................................................................................................................. 37 5.3 Tidal Flood Sources ............................................................................................................... 37 5.4 Surface Water Sources .......................................................................................................... 37 5.5 Groundwater Sources ........................................................................................................... 37 5.6 Strategic Flood Risk Assessment Level 1 – Flood Risk Review .............................................. 38 5.7 Main Settlements - West Devon Borough Council Planning Area ........................................ 38 5.8 Minor Settlements – West Devon Borough Council Planning Area ...................................... 38 5.9 Minor Settlements – Dartmoor National Park Authority Planning Area .............................. 39 6 BERE ALSTON ............................................................................................................................ 39 6.1 Main River ............................................................................................................................. 39 6.2 Ordinary Watercourses ......................................................................................................... 40 6.4 Tidal Flooding ........................................................................................................................ 40 6.5 Sewer Flooding ...................................................................................................................... 40 6.6 Highway Flooding .................................................................................................................. 40 6.7 Ground Water Flooding ........................................................................................................ 41 3 Level 1 Strategic Flood Risk Assessment West Devon Borough Council & Part of DNPA 6.8 Flood Mapping ...................................................................................................................... 41 7 BERE FERRERS ........................................................................................................................... 41 7.1 Main River ............................................................................................................................. 41 7.2 Ordinary Watercourses ........................................................................................................