Louth Coastal Catchment Flood Management Plan Summary Report December 2009 Managing Flood Risk We Are the Environment Agency
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Louth Coastal Catchment Flood Management Plan Summary Report December 2009 managing flood risk We are the Environment Agency. It’s our job to look after your environment and make it a better place – for you, and for future generations. Your environment is the air you breathe, the water you drink and the ground you walk on. Working with business, Government and society as a whole, we are making your environment cleaner and healthier. The Environment Agency. Out there, making your environment a better place. Published by: Environment Agency Kingfisher House Goldhay Way, Orton Goldhay Peterborough PE2 5ZR Tel: 08708 506 506 Email: [email protected] www.environment-agency.gov.uk © Environment Agency All rights reserved. This document may be reproduced with prior permission of the Environment Agency. December 2009 Introduction I am pleased to introduce our summary of the Louth Coastal Catchment Flood Management Plan (CFMP). This CFMP gives an overview of the flood risk in the Louth Coastal catchment and sets out our preferred plan for sustainable flood risk management over the next 50 to 100 years. The Louth Coastal CFMP is one of 77 CFMPs for England Trusthorpe Pumping Station in Mablethorpe. Breaching/ and Wales. Through the CFMPs, we have assessed inland failure of embankments that carry the main upland flood risk across all of England and Wales for the first rivers across the low lying area of the catchment could time. The CFMP considers all types of inland flooding, cause significant flood risk. Surface water drainage and from rivers, ground water, surface water and tidal sewer flooding can affect Louth and the coastal towns. flooding, but not flooding directly from the sea (coastal Parts of the Lincolnshire Wolds may be susceptible to flooding). This is covered by Shoreline Management groundwater flooding. Plans (SMPs). Our coverage of surface and groundwater We cannot reduce flood risk on our own. We will flooding is however limited due to a lack of available therefore work closely with all our partners to improve information. the co-ordination of flood risk activities. For example, The role of CFMPs is to establish flood risk management in parts of the catchment Internal Drainage Boards policies which will deliver sustainable flood risk (IDBs) have an important role in managing flood risk. management for the long term. This is essential if we are We will work in partnership with the IDBs to agree to make the right investment decisions for the future and the most effective way to manage flood risk in the to help prepare ourselves effectively for the impact of future. We also work with many other organisations, climate change. We will use CFMPs to help us target our groups and individuals with an interest in how flood limited resources where the risks are greatest. risk is managed. This includes local authorities, water companies, conservation bodies such as Natural This CFMP identifies flood risk management policies to England and the public. assist all key decision makers in the catchment. It was produced through a wide consultation and appraisal This is a summary of the main CFMP document. process, however it is only the first step towards an If you would like to see the full document an electronic integrated approach to flood risk management. As we version can be obtained by emailing enquiries@ all work together to achieve our objectives, we must environment-agency.gov.uk or telephoning 08708 506 monitor and listen to each others progress, discuss what 506. Alternatively, paper copies can be viewed at any has been achieved and consider where we may need to of our offices in Anglian Region. review parts of the CFMP. There are different sources of flood risk in the catchment. River flooding can affect Louth, Mablethorpe and Chapel St Leonards. Tide locking, which is where rivers cannot flow freely at high tide, can affect Willoughby Paul Woodcock High Drain at Chapel St Leonards Pumping Station and Regional Director Anglian Region Environment Agency Louth Coastal Catchment Flood Management Plan 1 Contents The purpose of a CFMP in managing flood risk 3 Catchment overview 4 Current and future flood risk 6 Future direction for flood risk management 12 Sub-areas 1 The Wolds 14 2 Saleby, Louth Upstream and Waithe Beck 16 3 Lowlands North 18 4 Louth 20 5 Middle Reaches 22 6 Lowlands South 24 7 Mablethorpe, Chapel St Leonards/Ingoldmells and Skegness 26 Map of CFMP policies 28 River Steeping, Crow Bridge 2 Environment Agency Louth Coastal Catchment Flood Management Plan The purpose of a CFMP in managing flood risk CFMPs help us to understand the • Internal Drainage Boards (IDBs), CFMPs aim to promote more scale and extent of flooding now water companies and other sustainable approaches to managing and in the future, and set policies utilities to help plan their flood risk. The policies identified in for managing flood risk within the activities in the wider context the CFMP will be delivered through a catchment. CFMPs should be used of the catchment; combination of different approaches. to inform planning and decision Together with our partners, we • transportation planners; making by key stakeholders such as: will implement these approaches • land owners, farmers and through a range of delivery plans, • the Environment Agency, who will land managers that manage projects and actions. use the plan to guide decisions and operate land for on investment in further plans, The relationship between the CFMP, agriculture, conservation projects or actions; delivery plans, strategies, projects and amenity purposes; and actions is shown in Figure 1. • regional planning bodies and • the public and businesses to local authorities who can use the enhance their understanding plan to inform spatial planning of flood risk and how it will activities and emergency be managed. planning; Figure 1 The relationship between CFMPs, delivery plans, projects and actions Policy planning • CFMPs and Shoreline Management Plans. • Action plans define requirement for delivery plans, projects and actions. Policy delivery plans (see note) Projects and actions • Influence spatial planning to reduce risk • Make sure our spending delivers the best and restore floodplains. possible outcomes. • Prepare for and manage floods • Focus on risk based targets, for example (including local Flood Warning plans). numbers of households at risk. • Managing assets. • Water level management plans. • Land management and habitat creation. Note: Some plans may not be led by us – we may • Surface water management plans. identify the need and encourage their development. Environment Agency Louth Coastal Catchment Flood Management Plan 3 Catchment overview The Louth Coastal CFMP area is The landscape of the CFMP area In the CFMP area there are a located within eastern Lincolnshire. varies significantly from west to number of sites designated for their It extends along the east coast from east. In the west is the higher environmental importance including Tetney, near Grimsby in the north, to ground of the Lincolnshire Wolds, Special Areas of Conservation Wainfleet in the south. The ridge of with rolling topography. To the east (SACs), Special Protection Areas hills in the Lincolnshire Wolds form of the Wolds the land is low-lying (SPAs) and Ramsar sites located the western boundary of the CFMP where the rivers are embanked. along the Lincolnshire coast. area. Map 1 shows the location and The low-lying areas are drained Important environmental sites in extent of the Louth Coastal CFMP. mainly by pumping and water the catchment include the Humber It includes the catchments of the is discharged into the embanked Estuary (Ramsar, SAC, SPA, SSSI), River Lud/Louth Canal, Waithe Beck, rivers or directly to the sea. Gibraltar Point (Ramsar, SAC, Greyfleet Drain, Great and Long Eau, However, there are some SPA, SSSI, NNR), Saltfleetby to Woldgrift Drain, Willoughby High watercourses which drain into Theddlethorpe Dunes (SAC, SSSI, Drain, the River Lymn and River the sea via outfalls using gravity. NNR) and The Wash (Ramsar, Steeping. The downstream limit Water levels in the lowland areas SSSI, SPA). The Lincolnshire of the CFMP area is located at the include those managed by Lindsey Wolds is designated as an Area of HECAG (Humber Estuary Coastal Marsh Drainage Board (LMDB). Outstanding Natural Beauty (AONB). Authorities Group) Shoreline There are also 26 Sites of Special The underlying geology of the area Management Plan (SMP) boundary, Scientific Interest (SSSI) in the CFMP is chalk. In the hilly areas to the which covers the coastline between area. Scheduled Monuments (SMs) west of the catchment runoff may Flamborough Head and Gibraltar and listed buildings, designated for infiltrate the rock delaying the Point. The SMP deals with coastal their heritage value, are distributed response of rivers to rainfall and flood management issues along this across the CFMP area. reducing peak flood flows. There coastline. is also a risk from groundwater The CFMP covers an area of around flooding in these areas. In the east 1,000 km2, and has a population the underlying chalk is covered by of around 100,000 people. It is thick till deposits which reduces predominantly rural, with over 90% the infiltration of rainfall into the of the CFMP area being used for soil. This combined with the low both arable or pastoral agricultural gradients means that water moves production. The main urban areas slowly to the river channels. are the coastal holiday resorts of Skegness, Ingoldmells and Mablethorpe and the market town of Louth. 4 Environment Agency Louth Coastal Catchment Flood Management Plan Map 1 Location and extent of the Louth Coastal CFMP area Louth Canal Environment Agency Louth Coastal Catchment Flood Management Plan 5 Current and future flood risk Overview of the current flood risk What is at risk? Flood risk has two components: Eau), Trusthorpe (Woldgrift Using river models we estimate the chance (probability) of a Drain) and Gibraltar Point that at present there are around particular flood and the impact (River Steeping); 2,750 people, 1,250 properties and (or consequence) that the flood 440 caravans at risk in the CFMP • breaching/failure of embankments would have if it happened.