Flood Risk Assessment in Bexhill

Bexhill-on-Sea is a low-lying seaside town on the East Sussex coast, built where a culverted stream, a shingle beach and a chalk-fed water table all compete for the same few metres of fall to the sea. A flood risk assessment in Bexhill has to hold all three sources in view at once: the tide pressing in from the Channel, the surface water that the town's Victorian drainage network was never sized for, and the sewers beneath it that still back up in heavy rain. Unda prepares flood risk assessments in Bexhill for planning, property purchase, mortgage and insurance, and BREEAM, alongside sequential and exception tests and surface-water drainage strategies, for sites from the seafront to the Combe Valley and the edge of the Pevensey Levels.

If you need a quote or want to talk a site through, contact one of our experienced flood risk consultants on 01293 214444.

Bexhill's chronic flooding has one recurring cause: the Egerton Park Stream is culverted for more than a kilometre beneath the town before it reaches a tide-gated outfall on the beach, so heavy rain that falls on a high tide has nowhere to go but back up through the pipe network and into the park.

Flood risk assessment in Bexhill at a glance

• The seafront is an Environment Agency flood warning area. West Parade, Egerton Park and De La Warr Parade sit within designated coastal flood warning and alert areas covering Bexhill's frontage.
• Sidley, Cooden and Little Common are flagged for sewer flooding. Rother District Council's Strategic Flood Risk Assessment names these three Bexhill localities as currently at high risk from the combined sewer network.
• Two authorities, two roles. East Sussex County Council is the Lead Local Flood Authority for surface water, groundwater and ordinary watercourses; Rother District Council is the local planning authority that decides your application.
• Storm Ciarán closed Westcourt Drive in November 2023. Sewer overflows were released for 55 hours at Bexhill and 71 hours at Galley Hill as the combined sewer system was overwhelmed, and the road flooded again in March 2024.
• The Pevensey Levels sit on Bexhill's eastern edge. Development draining toward this 4,300-hectare grazing marsh triggers Policy SRM2 and consultation with the Water Level Management Board.

Check flood risk anywhere in Bexhill

Bexhill-on-Sea is outlined below. Screen any postcode in the town against Environment Agency data for rivers and sea, surface water and the planning flood zones, with a climate outlook to 2125. It is an indicative first pass, not a substitute for a site-specific assessment.

Flood risk in Bexhill: tide-locked streams, sewers and the sea

Bexhill floods from three directions at once rather than one dominant river, which is why a generic report misses so much here. The seafront answers to the tide, the town centre answers to a culverted stream that cannot always reach the beach, and Sidley, Cooden and Little Common answer to a sewer network that Rother's own evidence base says is already under strain.

The tidal flood risk sits along West Parade, Egerton Park and De La Warr Parade, inside an Environment Agency flood warning area and a wider flood alert area covering the whole seafront. Behind the beach, the Egerton Park Stream runs from Sidley and Glenleigh Park through the town in a culvert more than a kilometre long before it discharges through a tide-gated outfall — the same mechanism that has flooded Egerton Park repeatedly since at least 1949. Further out, Combe Haven, the Main River that forms much of the boundary with Hastings, is tidally locked in its lower reaches and carries mapped Flood Zone 2, 3a and 3b, while the Pevensey Levels — the 4,300-hectare grazing marsh that stretches between Eastbourne and Bexhill — sit against the town's eastern edge and bring their own drainage-board consenting regime to any site that drains toward them.

• Coastal/tidal. The seafront corridor — West Parade, Egerton Park and De La Warr Parade — is a designated EA flood warning area, and the wider Bexhill coastline is covered by a flood alert area.
• Surface water (pluvial). The Egerton Park Stream's culvert backs up when heavy rain coincides with a high tide, and Rother's Surface Water Management Plan treats Bexhill as one of only three settlements in the district with a completed plan.
• Sewer flooding. Sidley, Cooden and Little Common are named in Rother's Strategic Flood Risk Assessment as currently at high risk, against a backdrop of 588 recorded sewer-flooding incidents across the district in the decade to around 2020.
• Fluvial. Combe Haven, the Main River on the Hastings boundary, is tidally locked in its lower reaches and mapped in Flood Zones 2, 3a and 3b.
• Groundwater and reservoirs. Rother's evidence base rates the district as generally at negligible groundwater risk away from Rye, and none of the area's reservoirs sit near Bexhill.

A history of flooding in Bexhill

These dated events are why Rother District Council and East Sussex County Council scrutinise development so closely here, and why a flood risk assessment in Bexhill has to be evidence-led rather than generic. Each one shows the same culvert-and-tide mechanism playing out again.

• 1949 and 1952 — Egerton Park. Archive photographs held by Bexhill Museum record the park lake flooding in both years, the earliest documented instances of a pattern local historians trace back more than a century.
• Winter 2013/14. Sussex was among the counties that bore the brunt of the UK's wettest winter in the England & Wales rainfall series back to 1766, with photographs from the time showing flooding at Westcourt Drive and Herbrand Walk in Bexhill.
• November 2023 — Storm Ciarán. Westcourt Drive was closed in both directions as floodwater reached roughly three feet under the bridge, and the overwhelmed combined sewer system released overflows for 55 hours at Bexhill and 71 hours at nearby Galley Hill.
• March 2024. Westcourt Drive, between Terminus Avenue and the Cooden Drive junction, closed again after heavy rain overwhelmed the same drainage corridor, prompting further drainage works.

A pattern runs through all of it: the same culvert, the same road and the same stretch of coast recur in the record decades apart. A robust assessment treats that history as evidence, not background colour.

Planning policy and your Lead Local Flood Authority in Bexhill

Two authorities set the rules for a Bexhill site. The Environment Agency leads on the sea and Combe Haven as a Main River. East Sussex County Council is the Lead Local Flood Authority for surface water, groundwater and ordinary watercourses across the whole county, while Rother District Council is the local planning authority that decides your application against its own Local Plan.

Rother's adopted Core Strategy commits new development to Policy EN6 (protecting communities from flooding, accounting for climate change) and Policy EN7 (flood risk considered at every planning stage), while the Development and Site Allocations Local Plan applies Policy DEN5 to require sustainable drainage on qualifying schemes. Anything draining toward the Pevensey Levels additionally engages Policy SRM2, which requires SuDS for development that adds impermeable area within the Levels' catchment, in consultation with the Pevensey and Cuckmere Water Level Management Board. All of this sits within East Sussex's Local Flood Risk Management Strategy and the district's Strategic Flood Risk Assessment, which Rother is updating to support its emerging 2025–2042 Local Plan.

Your assessment and drainage strategy must satisfy national policy — the NPPF and its Planning Practice Guidance — alongside these local requirements. Where a site is in a higher-risk flood zone, the Sequential and Exception Tests apply, and the 2025 national SuDS standards and the four pillars of SuDS shape what East Sussex CC and Rother DC will accept as a statutory consultee response.

Development and flood risk assessment in Bexhill

Bexhill is investing heavily in its seafront, its town centre and its business land, and each type of scheme brings the tide, the culvert or the sewer network into the assessment in a different way.

• Seafront and town-centre regeneration. The Bexhill Neighbourhood Board's regeneration plan for 2026–2030 prioritises public realm investment along the seafront and town centre, much of it within or next to the EA's coastal flood warning area and the culverted Egerton Park Stream corridor.
• North Bexhill business floorspace. Plans for up to 600,000 square feet of employment space across roughly 42 acres in north-east Bexhill would be the most significant business development in the county, and impermeable area at that scale triggers a full sustainable drainage strategy from the outset.
• The Bexhill to Hastings Link Road corridor. The road crosses the Combe Haven floodplain through a historic railway cutting; modelling for the scheme showed extensive flooding would occur there without mitigation, so a 7,250 cubic metre underground storage tank was built near London Road in 2008 to compensate for the lost floodplain storage — a reminder that anything built near this corridor inherits that hydraulic model.
• Combe Valley Countryside Park. This wetland and SSSI floods seasonally as part of its natural function, so development at its margins has to respect the functional floodplain and habitat constraints alongside the flood risk itself.
• Coastal residential sites at Cooden, Little Common and Galley Hill. These sit within or beside the EA's coastal flood warning and alert areas, and benefit from the ongoing Pevensey Bay to Eastbourne Coastal Management Scheme, which covers the 15 kilometre frontage from Cooden Beach to Holywell and recently received around £8 million for spring 2026 defence works.

Coastal defences reduce the chance of flooding at Bexhill; they do not remove it. The Flood Map for Planning is drawn as if defences were not there, so a defended seafront site can still sit in a flood zone that requires an assessment over its full lifetime, climate change allowances included.

How Unda helps with flood risk assessment in Bexhill

We act as the accurate translation layer between your scheme and the requirements set by the Environment Agency, East Sussex County Council as Lead Local Flood Authority, Rother District Council as the deciding planning authority, and national planning policy. We are experts on Bexhill's flooding, not a generic report mill.

A flood risk assessment in Bexhill from Unda assesses every credible source — the tide, the Egerton Park Stream and its culvert, Combe Haven, surface water and the sewer network — compares modelled flood levels against your proposed floor levels, sets safe access and egress, and recommends mitigation the regulators will accept. Where the council needs it, a surface-water drainage strategy sits alongside the assessment as a separate report, so the two cases stay consistent and an objection has nowhere to land.

Flood risk assessments and related reports for every situation in Bexhill

A flood risk assessment, a Sequential or Exception Test and a drainage strategy are three distinct reports. They often travel together in a planning submission, but they answer different questions: is the site safe, should the development be here, and where does the surface water go. We prepare all three in Bexhill, alongside the right form of assessment for buyers, lenders and BREEAM.

Flood risk assessments

• Flood risk assessment for planning. The core report, site-specific and prepared to satisfy the NPPF, the Environment Agency and Rother District Council. Groundwater and, where needed, flood modelling are assessed within it rather than as separate reports.
• Homebuyer and property-purchase survey. For conveyancing, where a search has flagged the coastal or Combe Haven risk and you need the actual building assessed, not a broad map.
• Flood risk assessment for insurance. Property-specific evidence for brokers and underwriters where premiums have risen or cover has been restricted along the seafront.
• Flood risk assessment for BREEAM. Structured around BREEAM Pol 03, which is credit-driven rather than safety-driven, so a planning FRA alone rarely satisfies it.
• Groundwater flood risk. Assessed as a source within the FRA on most Bexhill sites, or as a standalone hydrogeological assessment where the ground conditions are complex.

Sequential and Exception Tests

The Sequential and Exception Tests are a separate, locational report about whether a development should be in a higher-risk location at all. The Sequential Test defines an area of search, identifies reasonably available lower-risk sites and justifies the proposed site; the Exception Test is the second gate where development still needs to proceed. This is a live policy area, as our note on what the Yatton judgment means for planning explains.

Drainage strategy and SuDS

• Sustainable drainage strategy (SuDS). Surface-water engineering — calculates existing versus proposed runoff and proposes SuDS to satisfy Rother's Policy DEN5 and, where relevant, Policy SRM2 near the Pevensey Levels.
• Preliminary drainage design. The early, outline read that flags infiltration issues before they affect layout and land value.
• Discharge of drainage conditions. The detailed stage to discharge a pre-commencement or pre-occupation drainage condition.
• Flood modelling. 1D and 2D hydraulic modelling — a technique that feeds the assessment, Sequential Test or drainage design where national mapping is not enough, as it was for the Combe Valley Way storage tank.

Early in a drainage strategy it helps to know whether the ground will take water: our free geology and ground conditions map and BRE 365 infiltration rate calculator give an indicative read before a trial pit, and the drainage calculators help size the scheme. You can screen a postcode on our flood risk map, and every report is overseen by a chartered flood risk consultant who stays involved past the report to answer objections.

Bexhill flood risk management & emergency contacts

The most reliable Bexhill flood information comes from the lead authorities. For an immediate threat to life during a flood, always call 999; for a power cut during flooding, call 105.

• Check for flooding in Bexhill-on-Sea. Environment Agency live warnings, river and sea levels and maps at check-for-flooding.service.gov.uk; sign up for flood warnings or call Floodline on 0345 988 1188.
• Report flooding to East Sussex County Council. Surface water, groundwater and ordinary watercourse flooding is reported to the county's Lead Local Flood Authority team.
• Rother District Council emergency planning. Local flooding advice, vulnerable-area guidance and the district's multi-agency response role at rother.gov.uk.
• Southern Water. Sewer flooding on the public network, including the Bexhill main affecting Sidley, Cooden and Little Common.
• Southern Regional Flood and Coastal Committee. Sets regional investment priorities across the coast from West Hampshire to East Kent, including this stretch of East Sussex.
• Sussex Resilience Forum. The multi-agency partnership behind East Sussex's flood response planning, alongside Rother District Council's own emergency role.
• Pevensey Bay to Eastbourne Coastal Management Scheme. The Environment Agency partnership scheme protecting the frontage from Cooden Beach to Holywell at pevenseyandeastbournecoast.co.uk.

For broader policy context, our notes on who manages flood risk in England and on the Environment Agency's planning role are a good starting point, and our live river levels map shows whether Combe Haven or the wider Sussex coast is running high right now.

Flood risk assessment in Bexhill: frequently asked questions