Rother and Romney 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 Guildbourne House Chatsworth Road Worthing, West Sussex BN11 1LD 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. Introduction I am pleased to introduce our summary of the Rother and Romney Catchment Flood Management Plan (CFMP). This CFMP gives an overview of the flood risk in the Rother and Romney catchment and sets out our preferred plan for sustainable flood risk management over the next 50 to 100 years. The Rother and Romney CFMP is one of 77 CFMPs for The main source of flood risk in the Rother and Romney England and Wales. Through the CFMPs, we have CFMP area is from both river and tidal flooding and to a assessed inland flood risk across all of England and lesser extent surface and ground water flooding. The Wales for the first time. The CFMP considers all types of main areas at risk from tidal flooding are Rye, Hythe, inland flooding, from rivers, groundwater, surface Folkestone, Hamstreet, Robertsbridge and Etchingham. water and tidal flooding, but not flooding directly from We cannot reduce flood risk on our own, we will the sea (coastal flooding), which is covered by therefore work closely with all our partners to improve Shoreline Management Plans (SMPs). Our coverage of the co-ordination of flood risk activities and agree the surface and groundwater is however limited due to a most effective way to management flood risk in the lack of available information. future. The key partners we have worked with are Kent The role of CFMPs is to establish flood risk County Council, East Sussex County Council, Rother management policies which will deliver sustainable District Council, Shepway District Council, Ashford flood risk management for the long term. This is Borough Council, Romney Marsh Internal Drainage essential if we are to make the right investment Board, Natural England, English Heritage, Southern decisions for the future and to help prepare ourselves Water, National Farmers Union. effectively for the impact of climate change. We will This is a summary of the main CFMP document, if you use CFMPs to help us target our limited resources need to see the full document an electronic version where the risks are greatest. can be obtained by emailing This CFMP identifies flood risk management policies to [email protected] or alternatively assist all key decision makers in the catchment. It was paper copies can be viewed at any of our offices in produced through a wide consultation and appraisal Southern Region. process, however it is only the first step towards an integrated approach to flood risk management. As we all work together to achieve our objectives, we must monitor and listen to each others progress, discuss what has been achieved and consider where we may Toby Willison need to review parts of the CFMP. Regional Director, Southern Region Environment Agency Rother and Romney Catchment Flood Management Plan 3 Contents The purpose of a CFMP in managing flood risk 5 Catchment overview 6 Current and future flood risk 8 Future direction for flood risk management 11 Sub-areas 1 Robertsbridge and Etchingham 13 2 Hamstreet 15 3 Romney and Walland Marshes 16 4 Hythe and Folkestone 18 5 Rye 20 6 Rural Rother 21 Map of CFMP policies 23 4 Environment Agency Rother and Romney Catchment Flood Management Plan The purpose of a CFMP in managing flood risk CFMPs help us to understand the • IDBs, water companies and CFMPs aim to promote more scale and extent of flooding now other utilities to help plan their sustainable approaches to managing and in the future, and set policies activities in the wider context flood risk. The policies identified in for managing flood risk within the of the catchment; the CFMP will be delivered through a catchment. CFMPs should be used combination of different approaches. • Transportation planners; to inform planning and decision Together with our partners, we making by key stakeholders such as: • Land owners, farmers and will implement these approaches land managers that manage through a range of delivery plans, • The Environment Agency, who will and operate land for projects and actions. use the plan to guide decisions agriculture, conservation on investment in further plans, The relationship between the CFMP, and amenity purposes; projects or actions; delivery plans, strategies, projects • The public and businesses to and actions is shown in figure 1. • Regional planning bodies and enhance their understanding local authorities who can use the of flood risk and how it will plan to inform spatial planning be managed. activities and emergency 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 Rother and Romney Catchment Flood Management Plan 5 Catchment overview The CFMP area is situated in the through the towns of Robertsbridge The geology of the area consist of South East of England, covers and Etchingham. These towns have alluvium and marine silts in the approximately 970km2 with a experienced severe flooding since Rother and Walland Marshes with population of 175,000 people. the 1940s. The upper part of the Gault clay and Chalk in eastern There are a number of towns within catchment is mainly woodland and extremity of Romney Marsh. the CFMP area including Rye, grassland, but in some locations Hastings Beds in the High Weald Tenterden, Hythe, Dymchurch, Lydd, natural floodplains have been and shingle headland of Dungeness Robertsbridge and New Romney modified by farming and urban extending into the English Channel. with the major towns of Hastings development with the result of There are six sub-areas each with a and Folkestone at the edge of the increasing run-off to the lower part preferred policy that divide the CFMP area. of the catchment. The lower and catchment area; the Robertsbridge eastern part of the catchment and Etchingham, Hamstreet, Rye, The primary river system within the consists of a wide expanse of Rother and Walland Marshes, Hythe CFMP area is the River Rother along reclaimed coastal marshland which and Folkestone and Rural Rother. with its tributaries. The River Rother lies mostly below the spring tide rises near Mayfield in East Sussex level. and flows eastward extending ➜ View south of rural Rother near Udimore, Kent. 6 Environment Agency Rother and Romney Catchment Flood Management Plan Map 1. Overview map of Rother and Romney catchment. ‘The north and west of the Rother and Romney catchment is part of the High Weald, mainly woodland, grassland and natural floodplains, while the south and east are characterised by a wide expanse of reclaimed coastal marshland.’ Environment Agency Rother and Romney Catchment Flood Management Plan 7 Current and future flood risk Overview of the current Where is the risk? flood risk This map in page 10 illustrates the The areas with the highest Flood risk is the combination of the consequences of a 1% annual concentration of properties at risk probability flood event (1 in 100 probability of flooding and its from river flooding are tabulated year) occurring in the CFMP area. impact, that is, the chance of it on page 9. happening and the consequences if it does happen. We have assessed flood risk across the CFMP area Figure 2. Current and future (2100) flood risk to property from a 1% annual using broad-scale computer probability river flood, taking into account current flood defences. modelling, though making best use of existing knowledge and models 3000 where appropriate. Flood risk Current Future figures take into account current 2500 flood defences. 2000 The flood generation mechanism within the Rother and Romney CFMP 1500 area varies in relation to both the watercourse and the location within 1000 the catchment. Significant flooding Number of properties at flood risk at properties Number of 500 problems are associated with the urban areas of Robertsbridge, 0 Robertsbridge and Hamstreet Hythe and Rye Etchingham and Hamstreet. Etchingham Folkestone Robertsbridge has suffered ever increasing flooding since 1946. In the lower Rother catchment there are several minor tributaries and drains that can cause isolated flood incidents and the Romney and Walland Marshes are prone to both river and coastal flooding. ➜ High waters on the River Rother. 8 Environment Agency Rother and Romney Catchment Flood Management Plan How we currently Table 1. Locations of towns and villages with 25 or more properties at risk manage the risk in a 1% annual probability river flood. The area is very low lying and there Number of properties at risk Locations is a network of channels, drains, >1000 Rye, Hythe and Folkestone and structures which together with the Royal Military Canal combine to 500 to 1000 None drain the area for agricultural use.