River Axe Flood Risk Study

Total Page：16

File Type：pdf, Size：1020Kb

What can we learn from the River Axe – an award winning project Sun Yan Evans – Mott MacDonald Andy Emblin – Environment Agency Outline 1. Introduction 2. River Axe catchment 3. History of flooding 4. Project set up & funding 5. Project governance 6. Tiered approach & efficiency 7. Key ingredients for success Introduction R. Yarty River Axe catchment R. Axe 96km2 178km2 Key features R. Yarty R. Axe Axminster History of flooding – Chard Junction 31/12/2000 19/12/1992 29/11/1965 07/07/2012 History of flooding – Broom 13/10/1993 13/10/1993 7/12/2000 30/11/2012 Key recent event: 7th July 2012 storm 7th July 2012 event Chard Junction Broom Weycroft Axminster Whitford Damages from 7th July 2012 event All three parties affected EA Network Rail DCC Response from organisations affected • EA – A more evidence-based understanding of present day flood risk • Network Rail – To enable better management of future flood risk, develop asset resilience • Devon County Council – To assist future planning of flood risk management Project set up & funding Common interests: to improve understanding of flood risk, to tackle challenges and issues for greater & wider benefits Project set up Partnership Collaborative funding working Project governance Senior Users Senior Supplier Advisory Group (Legal, procurement) Project Board Project Product Director Owners Stakeholder Working Group Project Team (Chair: EA PM) Joint development of project scope We understand each other’s needs & requirements, impacts and benefits Tiered approach to bring further efficiency Flood risk assessment - approach • 2D model Ü • Multiple events • Multiple scenarios • Flood progression • Depth, velocity, hazard 2013 Channel Survey • Wider use Extent of 2D domain 1m LiDAR Elevation (mAOD) 250m – WFD 10m SAR Elevation (mAOD) – Option testing 170m 0m 0 0.75 1.5 3 Kilometers Asset Vulnerability: Key sections at risk of flooding Railway Road Chard Junction Station Road, Chard Junction Broom Crossing Broom Lane Axe Farm Weycroft Weycroft Bridge Millbrook Stream White Bridge Shand Park B3261 Bow Bridge Whitford Whitford Road Volumes > 25,000m3 stored behind railway Key achievements for Tier 1 • Better Understanding of: – Flood Risk – Critical risk locations – Magnitude of vulnerability – Present day hazard • Built the evidence for further actions • Develop a model for wider use in the future What happened after Tiers 1, 2 & 3? • Develop scoping plan for next phase • Option development & testing • Narrow down options • Consultations • Preferred options selected • Schemes under implementation EA Project Excellence Award 2016 Summary - key ingredients for success Leadership Vision Partnership Commitment Knowledge Thank You [email protected] [email protected].

Copy Link

Recommended publications

Seaton Wetlands Sidmouth Seaton
How to find us © CROWN COPYRIGHT DATABASE RIGHTS 2012 ORDNANCE SURVEY 100023746 ORDNANCE SURVEY RIGHTS 2012 COPYRIGHT DATABASE © CROWN Lyme Regis Colyford Axe Estuary Axe Estuary WETLANDS WETLANDS A3052 Seaton Wetlands Sidmouth Seaton Seaton Road Wetlands Information Axe Estuary ENTRANCE Seaton Cemetery WETLANDS ◊ Free parking River Axe ◊ Toilets (including disabled toilet and baby changing) ◊ 5 bird hides Seaton Wetlands is located six miles west of ◊ Tramper off-road mobility scooter hire Lyme Regis and eight miles east of Sidmouth, ◊ Discovery hut between Colyford and Seaton. ◊ Picnic area In the middle of Colyford village on the A3052, take the Seaton road, signposted Axe Vale Static ◊ No dogs except assistance dogs Caravan Park. After half a mile turn left into ◊ Refreshments at weekends Seaton cemetery and continue through the ◊ Cycling welcomed on most of site cemetery car park to the Wetlands parking area. ◊ Wheelchair and buggy friendly paths ◊ Pond dipping equipment for hire Contact the countryside team: East Devon District Council ◊ Nearly 4 miles of trails/boardwalks Knowle Sidmouth EX10 8HL Tel: 01395 517557 Email: [email protected] www.eastdevon.gov.uk /eastdevoncountryside X2002 East Devon – an outstanding place Lyme Regis Colyford welcome to seaton wetlands N Swan Hill Road Sidmouth Entrance Popes Lane 1 Tram line Tram path Wheelchair friendly Footpath Colyford Seaton Road Common Hide 1 Water body Water Reserve Nature bed Reed colyford common Tidal salt marsh with broadwalk access to hide, viewing WC 2 platform and circular reedbed walk. Bus stop allowed Cyclists ﬂooded area Seasonally Island Hide 3 Cemetery Entrance Marsh Lane Tower Hide Colyford Road Colyford 2 stafford marsh River Axe Ponds, reeds and the Stafford Brook make up the learning zone and wildlife garden.
[Show full text]
River Axe Draft Restoration Plan
Restoring the River Axe Site of Special Scientific Interest and Special Area of Conservation River Restoration Plan Draft for comment - 7 December 2015 to 17 January 2016 CONTENTS Chapter Page Executive Summary 1 Aim of the restoration plan 1 Working with others 2 How to comment on the draft plan 3 Delivering the restoration plan 3 1 Restoration of the River Axe 5 1.1 Introduction 5 1.2 The need for restoration 7 1.3 A restoration vision 7 1.4 How can we deliver this restoration? 8 1.5 Our approach 8 1.6 How to use this plan 10 1.7 Who is this plan for? 11 2 The River Axe Site of Special Scientific Interest 12 2.1 Geology and hydrology 12 2.2 Ecology 13 2.3 Conservation objectives for the River Axe SSSI 13 2.4 Condition of the River Axe SSSI 14 2.5 Water Framework Directive objectives 16 2.6 Land use and land use change 17 2.7 Water quality 17 2.8 Flood risk 18 2.9 Invasive non-native species and disease 19 2.10 Influences on geomorphology and channel change 20 3 River sector descriptions 23 3.1 Summary of sector descriptions 23 3.2 Upper sector 25 3.2.1 Physical characteristics 26 3.2.2 Historical change 26 3.2.3 Geomorphological behaviour 27 3.2.4 Significant issues 27 3.3 Mid sector 29 3.3.1 Physical characteristics 30 3.3.2 Historical change 30 3.3.3 Geomorphological behaviour 31 3.3.4 Significant issues 31 3.4 Lower sector 33 3.4.1 Physical characteristics 35 3.4.2 Historical change 35 3.4.3 Geomorphological behaviour 36 3.4.4 Significant issues 36 DRAFT FOR COMMENT 4 Channel modifications and restoration measures 38 4.1 Geomorphology
[Show full text]
South West River Basin District Flood Risk Management Plan 2015 to 2021 Habitats Regulation Assessment
South West river basin district Flood Risk Management Plan 2015 to 2021 Habitats Regulation Assessment March 2016 Executive summary The Flood Risk Management Plan (FRMP) for the South West River Basin District (RBD) provides an overview of the range of flood risks from different sources across the 9 catchments of the RBD. The RBD catchments are defined in the River Basin Management Plan (RBMP) and based on the natural configuration of bodies of water (rivers, estuaries, lakes etc.). The FRMP provides a range of objectives and programmes of measures identified to address risks from all flood sources. These are drawn from the many risk management authority plans already in place but also include a range of further strategic developments for the FRMP ‘cycle’ period of 2015 to 2021. The total numbers of measures for the South West RBD FRMP are reported under the following types of flood management action: Types of flood management measures % of RBD measures Prevention – e.g. land use policy, relocating people at risk etc. 21 % Protection – e.g. various forms of asset or property-based protection 54% Preparedness – e.g. awareness raising, forecasting and warnings 21% Recovery and review – e.g. the ‘after care’ from flood events 1% Other – any actions not able to be categorised yet 3% The purpose of the HRA is to report on the likely effects of the FRMP on the network of sites that are internationally designated for nature conservation (European sites), and the HRA has been carried out at the level of detail of the plan. Many measures do not have any expected physical effects on the ground, and have been screened out of consideration including most of the measures under the categories of Prevention, Preparedness, Recovery and Review.
[Show full text]
South West River Basin Management Plan, Including Local Development Documents and Sustainable Community Strategies (Local Authorities)
River Basin Management Plan South West River Basin District Contact us You can contact us in any of these ways: • email at [email protected] • phone on 08708 506506 • post to Environment Agency (South West Region), Manley House, Kestrel Way, Exeter EX2 7LQ The Environment Agency website holds the river basin management plans for England and Wales, and a range of other information about the environment, river basin management planning and the Water Framework Directive. www.environment-agency.gov.uk/wfd You can search maps for information related to this plan by using ‘What’s In Your Backyard’. http://www.environment-agency.gov.uk/maps SW River Basin Management Plan Erratum The following changes were made to this document in January 2011. Table 1 updated to reflect reduction by two in number of heavily modified river water bodies and increase by two in number of natural river water bodies. Figure 15 for Tamar catchment updated to reflect change in two river water bodies from heavily modified to natural (see erratum sheet in Annex B for water body specific details). Published by: Environment Agency, Rio House, Waterside Drive, Aztec West, Almondsbury, Bristol, BS32 4UD tel: 08708 506506 email: [email protected] www.environment-agency.gov.uk © Environment Agency Some of the information used on the maps was created using information supplied by the Geological Survey and/or the Centre for Ecology and Hydrology and/or the UK Hydrographic Office All rights reserved. This document may be reproduced with prior
[Show full text]
Cc100712cba Severe Weather Event 7Th July 2012
Devon County Council HTM/12/42 Report on Severe Weather Event 7 th July 2012 Synopsis On Friday 6 th July at 18:30 a RED warning was issued for the risk of severe disruption to Devon and Cornwall on Saturday 7 th July due to surface water and river flooding. This was an update to previous yellow and amber warnings issued earlier in the day. In the event, 45 to 90mm fell in parts of South Devon and 45-120mm fell in parts of East Devon according to the Environment Agency. Two severe flood warnings were issued for the River Yealm and the River Axe and a further 27 other flood warnings were issued, predominantly in South, Mid and East Devon. Current reports are suggesting that over 140 properties were affected by the flooding in Devon, but similar previous events suggest that this number will rise in time. Weather Radar 03:05 7 th July 2012 (courtesy of Meteogroup) Over 272 incidents were logged over the weekend the majority being on the Saturday morning after the main rainfall overnight on Friday. The Strategic Co-ordinating Group (Emergency services, local authorities, EA and Met Office) mobilised on Friday evening and Police Silver Control was active during Saturday to co-ordinate the multi-agency response. Further warnings are in place for potential further rain impacts on Wednesday to Friday, and these warnings are being carefully monitored – see overleaf. -1- Devon County Council DCC’s Flood Risk Management, Highways and Emergency Planning Teams are working closely with the District Councils and the Environment Agency to coordinate a full response.
[Show full text]
Download Annex A
Landscape Character Assessment in the Blackdown Hills AONB Landscape character describes the qualities and features that make a place distinctive. It can represent an area larger than the AONB or focus on a very specific location. The Blackdown Hills AONB displays a variety of landscape character within a relatively small, distinct area. These local variations in character within the AONB’s landscape are articulated through the Devon-wide Landscape Character Assessment (LCA), which describes the variations in character between different areas and types of landscape in the county and covers the entire AONB. www.devon.gov.uk/planning/planning-policies/landscape/devons-landscape-character- assessment What information does the Devon LCA contain? Devon has been divided into unique geographical areas sharing similar character and recognisable at different scales: 7 National Character Areas, broadly similar areas of landscape defined at a national scale by Natural England and named to an area recognisable on a national scale, for example, ‘Blackdowns’ and ‘Dartmoor’. There are 159 National Character Areas (NCA) in England; except for a very small area in the far west which falls into the Devon Redlands NCA, the Blackdown Hills AONB is within Blackdowns NCA. Further details: www.gov.uk/government/publications/national-character-area-profiles-data-for-local- decision-making/national-character-area-profiles#ncas-in-south-west-england 68 Devon Character Areas, unique, geographically-specific areas of landscape. Each Devon Character Area has an individual identity, but most comprise several different Landscape Character Types. Devon Character Areas are called by a specific place name, for example, ‘Blackdown Hills Scarp’ and ‘Axe Valley’.
[Show full text]
The Evolution of the Rivers of East Devon and South Somerset, UK
R.W. Gallois THE EVOLUTION OF THE RIVERS OF EAST DEVON AND SOUTH SOMERSET , UK R.W.G ALLOIS Gallois, R.W. 2006. The evolution of the rivers of east Devon and south Somerset, UK. Geoscience in south-west England, 11 , 205-213. With the exception of the River Tone, which appears to have been separated at an early stage from its neighbours to the south by a major fault, the rivers of south Somerset and east Devon were initiated on a southward dipping Tertiary planation surface. The evolutionary histories of the present-day catchments of the rivers Exe and Otter are complex and inter-related. Those of the adjacent Axe and Teign appear to be less complex and may have evolved relatively independently from the Exe-Otter system. The differences in the histories of the catchments are most clearly demonstrated by their terrace systems. The Exe-Otter catchment has 10 or more terrace levels at heights of up to 140 m above the modern ﬂoodplain. In contrast, the Axe, Teign and Tone catchments contain only one or two terrace levels all of which are less than 20 m above the present-day valley ﬂoor. The explanation suggested here for the difference involves a sequence of river captures that changed the forerunner of the present-day Otter from a major river capable of producing a 3-km wide gravelly braidplain into a minor stream. 92 Stoke Valley Road, Exeter, EX4 5ER, U.K. (E-mail: [email protected]). INTRODUCTION The middle and lower reaches of the River Exe and the There are too few age data to determine the period of time adjacent catchments of the Axe, Otter, Teign and Tone drain an during which the terrace sequences in south-west England area with a complex topographical relief that ranges from over evolved, but comparison with the denudation chronology of 300 m above Ordnance Datum (O.D.) in the Blackdown Hills southern England as a whole suggests that all the terraces to a few metres above O.D.
[Show full text]
The River Otter Invasives Project Year 3 Report
The River Otter Invasives Project Year 3 Report October 2014 Prepared by Roland Stonex FWAG SouthWest c/o Environment Dept County Hall Taunton Somerset TA1 4DY Email: [email protected] Acknowledgements Thanks are due to the following organisations who provided financial / in-kind support to the River Otter Invasives Project during 2014: Environment Agency Blackdown Hills AONB Natural England River Otter Association Otter Valley Association Tale Valley Trust Westcountry Rivers Trust Farming Advice Service Clinton Devon Estates Neroche Conservation Volunteers Devon Wildlife Trust (East Devon volunteers) Honiton Town Council Otterhead Estate Trust Upottery Parish Council Also there were a number of individual volunteers and farmers/landowners who willingly gave their time and/or permission to access their land and parish councils for promotion etc Contents 1. Background to the River Otter Invasives Project Page 1 2. Coordination / encouraging efforts across the whole catchment Page 2 3. Walkover surveys 2014 – upper catchment Page 3 4. Awareness raising 2014 Page 5 5. Practical control measures 2014 – upper catchment Page 7 6. Assessement of success of project 2012-14 Page 9 7. Future recommendations Page 11 Further information / references Page 15 Appendices Page 15 1. Background to River Otter Invasives Project NB The project was previously known as the Otter Himalayan Balsam Control Project but has been renamed the River Otter Invasives Project (ROIP) for the final year, however Balsam remains the main focus. The ROIP aims to control the invasive, non-native plant Himalayan Balsam Impatiens Glandulifera along the tributaries and headwaters of the River Otter in East Devon. Himalayan balsam has rapidly become one of the UK’s most widespread invasive weeds, colonizing river banks, waste land, damp woodlands, roadways and railways.
[Show full text]
Parish Plans Biodiversity Project
Parish Biodiversity Audit for Axmouth Consultation draft – April 2010 Anne Harvey Report commissioned by Devon County Council Data supplied by the Devon Biodiversity Records Centre Contents INTRODUCTION ..................................................................................................................................... 4 DESIGNATED SITES .............................................................................................................................. 7 SITES OF SPECIAL SCIENTIFIC INTEREST ............................................................................................ 7 Axmouth to Lyme Regis Undercliffs SSSI .................................................................................. 7 Springhead Axmouth SSSI ......................................................................................................... 11 River Axe SSSI............................................................................................................................. 12 SPECIAL AREAS OF CONSERVATION .................................................................................................. 13 Sidmouth to West Bay Special Area of Conservation ............................................................ 13 River Axe Special Area of Conservation .................................................................................. 14 Poole Bay to Lyme Bay Reefs draft Special Area of Conservation ...................................... 14 NATIONAL NATURE RESERVES .........................................................................................................
[Show full text]
The Rivers Avon & Erme Salmon Action Plan ~ Consultation Document
The Rivers Avon & Erme SAP Consultation Document Item Type monograph Publisher Environment Agency Download date 28/09/2021 17:35:46 Link to Item http://hdl.handle.net/1834/27372 The Rivers Avon & Erme Salmon Action Plan ~ Consultation Document CONTENTS 1 LIST OF TABLES 2 LIST OF FIGURES 3 EXECUTIVE SUMMARY 4 SUMMARY OF URGENT ACTIONS 4 PART 1. INTRODUCTION 5 PART 2. DESCRIPTION OF CATCHMENT 6 2.1 Rainfall, flows and abstractions 7 2.2 Water quality 8 PART 3. DESCRIPTION OF THE FISHERIES (ROD & NET) 12 3. 1 Catches, Fishing Effort & Exploitation 13 3.1.1 Rod Catch 13 3.1.2 Rod Effort 14 3.1.2.1 Rod Fishery Exploitation Levels 15 3.1.3 Net & Fishing Weir Exploitation 16 3.1.3.1 Contributions to Distant and Homewater Fisheries 16 3.1.4 Salmon versus Sea Trout Catches 17 3.2 Participation & Fishery Value 18 3.2.1 Participation 18 3.2.2 Economic Value 19 PART 4. DESCRIPTION OF STOCKS, CURRENT STATUS AND RELEVANT TRENDS 22 4.1 Adult Salmon Run 22 4.2 Juvenile Abundance 23 4.3 Distribution of Spawning and Utilisation of the Avon and Erme Catchments 27 PART 5. CONSERVATION LIMITS & COMPLIANCE ASSESSMENT 29 5.1 Conservation Limits 29 5.2 Compliance Assessment 30 PART 6. FACTORS LIMITING STOCK ABUNDANCE & DIVERSITY 33 6.1 Adult Return 33 6.1.1 Impacts on Physical Habitat 34 6.1.2 Impacts on Chemical Habitat 34 6.2 Biological Limiting Factors 34 6.3 Fishery Limiting Factors 34 6.4 Management Information Issues 35 6.5 Supporting Information on Issues Within the Freshwater Phase 35 PART 7.
[Show full text]
Initial Habitats Regulations Assessment Report Greater Exeter Strategic Plan - Draft Policies and Site Options Consultation
Initial Habitats Regulations Assessment Report Greater Exeter Strategic Plan - Draft Policies and Site Options Consultation Durwyn Liley, Rachel Hoskin & Sophie Lake FOOTPRINT ECOLOGY, FOREST OFFICE, BERE ROAD, WAREHAM, DORSET BH20 7PA WWW.FOOTPRINT - ECOLOGY.CO.UK 01929 552444 Footprint Contract Reference: 407 Date: 5th June 2020 Version: Final Recommended Citation: Liley, D., Hoskin, R. & Lake, S. (2020) Initial Habitats Regulations Assessment Report Greater Exeter Strategic Plan Draft Policies and Site Options Consultation. Unpublished report for the GESP. i GESP HRA: Draft Policies and Site Options Consultation Summary This report is an initial report to inform the Habitats Regulations Assessment (HRA) of the Greater Exeter Strategic Plan (GESP) and has been produced alongside an early draft of the Draft Policies and Site Options Consultation. It has been undertaken in the early stages of the preparation of the GESP in recognition of the risks posed to European sites as a result of new growth in the Greater Exeter area. The HRA will continue to develop alongside future iterations of the GESP. This report has been prepared by Footprint Ecology on behalf of the GESP partners (East Devon, Exeter, Teignbridge and Mid Devon councils). HRA is a step by step process of ensuring that a plan or project being undertaken by, or permitted by, a public body will not adversely affect the ecological integrity of a European site. European sites include Special Protection Areas (SPAs), which are classified for their bird populations of European interest, and Special Areas of Conservation (SACs), which are designated for habitats and species of European interest. The legislation sets out a clear step by step approach for decision makers considering any plan or project.
[Show full text]
River Otter Geomorphological Audit
Tender Ref. 12709 Geomorphological Assessment of the River Otter, Devon Report UC0672 March 2004 GeoData Institute Tender Ref. 12709 Geomorphological Assessment of the River Otter, Devon Emery, J.C., Hill, C.T. and Sear, D.A. Report UC0672 March 2004 GeoData Institute University of Southampton Southampton SO17 1BJ Tel: 023 8059 2719 Fax: 023 8059 2849 e-mail: [email protected] CONTENTS 1 INTRODUCTION............................................................................................................................... 3 2 AIM AND OBJECTIVES .................................................................................................................. 3 3 CATCHMENT CHARACTERISTICS ............................................................................................ 4 4 BANK EROSION THEORY ............................................................................................................. 9 5 METHODOLOGY ............................................................................................................................13 5.1 DATA COLLECTION .....................................................................................................................14 5.1.1 Contemporary Field Survey ...................................................................................................14 5.1.2 Historical (archive) data .......................................................................................................15 6 HISTORICAL GEOMORPHOLOGY ............................................................................................17
[Show full text]