Flood Risk Assessment in Winchelsea Beach

Winchelsea Beach sits on reclaimed marshland behind a shingle bank on the East Sussex coast, so most of the village lies in Flood Zone 3 and its main flood risk is tidal. A flood risk assessment in Winchelsea Beach shows Rother District Council and the Environment Agency that a development can be made safe for its lifetime, and that it will not push risk onto neighbouring land. Unda prepares these assessments for planning, property purchase, mortgage and insurance, and BREEAM, alongside sequential and exception tests and surface-water drainage strategies.

Winchelsea Beach and Pett Level are low-lying ground kept dry by an engineered shingle beach, groynes and a secondary embankment, which is exactly why the Environment Agency and Rother District Council look closely at the flood risk behind any new development here.

To talk a Winchelsea Beach site through with one of our experienced flood risk consultants, call 01293 214444 or email enquiries@unda.co.uk. We give a fixed-fee quote after we have looked at the site, and one of our consultants will get back to you within 60 minutes.

• Dominant risk is tidal. The sea, held back by the Pett Level shingle beach and secondary embankment, is the defining flood source; the tidal Rivers Brede, Tillingham and Rother add fluvial risk inland.
• Mostly Flood Zone 3. Much of Winchelsea Beach, Pett Level and the low ground around Winchelsea falls within the Environment Agency's highest-probability flood zone for rivers and the sea.
• Defended, not risk-free. A capital scheme completed in 2009 gives the frontage a 1-in-200-year (0.5% annual chance) standard of protection, but planning still treats the land behind defences as at risk.
• Two authorities, one drainage board. The Environment Agency leads on the sea and main rivers; East Sussex County Council is the Lead Local Flood Authority; the Romney Marshes Area Internal Drainage Board manages water levels across Pett Level.
• Fixed-fee, fast. Unda has prepared flood risk assessments and drainage strategies for coastal and low-lying sites across East Sussex, with a senior consultant signing off every report.

Check the flood risk at your Winchelsea Beach site

Use the interactive map below to screen any postcode in and around Winchelsea Beach against live Environment Agency data: flood zones for rivers and the sea, surface water, and the climate-change outlook to 2125. Winchelsea Beach and the surrounding Icklesham parish are outlined in coral. This is an indicative first pass to understand the setting; it is not a substitute for a site-specific flood risk assessment. For a wider view you can also use our free flood risk map and live river levels map.

Where flood risk comes from in Winchelsea Beach

The main flood risk in Winchelsea Beach is tidal. The village sits on reclaimed coastal marsh at the western end of Rye Bay, on ground that lies below the level of high spring tides and is kept dry by a shingle beach and a line of secondary defences. Behind that frontage, the tidal Rivers Brede, Tillingham and Rother run out to sea through Rye Harbour, and surface water and groundwater add risk on the low, flat land. A flood risk assessment here has to weigh every one of those sources, because they interact.

Tidal and coastal flooding

Tidal flooding is the source that defines Winchelsea Beach. High storm surges, driven by low pressure and strong onshore winds on top of a high spring tide, can raise sea levels enough to overtop or breach the shingle bank, and the land behind sits low enough that water would spread across Pett Level. The Environment Agency's flood warning area for Winchelsea, Winchelsea Beach and Pett Level broadly follows the ground where the chance of flooding in any year is greater than 1%. Rising sea levels add to this over time, giving each future surge a higher starting point.

River (fluvial) and tidal-river flooding

Three watercourses reach the sea beside the village, all of them tidal in their lower reaches. The River Brede passes Winchelsea Strand; the River Tillingham and the Eastern Rother join it at Rye Harbour. Where a river is tidal, its level is driven by the sea as well as by rainfall in the catchment, so a high tide and heavy inland rain arriving together is the difficult case. A separate Environment Agency flood warning area covers Winchelsea properties adjacent to the Brede, which shows how closely the fluvial and tidal risks sit alongside one another here.

Surface water and groundwater

On flat, low-lying marsh, rainwater does not drain away quickly. Surface water collects in ditches and dykes that are managed by the Romney Marshes Area Internal Drainage Board, and outfalls to the sea and rivers depend on the tide being low enough to let water out. Groundwater sits close to the surface across the reclaimed marsh, which limits how well soakaways work and needs to be understood before any drainage design is fixed. Our guide to surface water flooding and planning explains why this source is now scrutinised so heavily. Every flood risk assessment considers groundwater as one of its sources.

The sea defences and Pett Level

Winchelsea Beach is only habitable because the sea is held back. The frontage from Cliff End to the mouth of the Rother is defended by a managed shingle beach, timber groynes that hold the shingle in place, and, behind it, an earth embankment that runs between Winchelsea Beach and Rye Harbour as a secondary line. A capital scheme completed in 2009 raised the standard of protection to a 1-in-200-year event (a 0.5% chance in any year), adding groynes, recharging the shingle and building the secondary bund and a gabion wall. The Environment Agency maintains the beach by re-profiling and recharging the shingle, and the frontage is managed under the wider Folkestone to Cliff End strategy and the Rother Tidal Walls East flood risk management strategy.

For a flood risk assessment, the presence of defences does not remove the risk; it shapes it. National planning policy treats land behind a defence as still at risk, because defences can be overtopped, can fail, and have a design life. An assessment has to consider the residual risk, the hazard if a breach occurred, and how the development would remain safe. That is why a Winchelsea Beach site in Flood Zone 3 usually needs a detailed, site-specific report rather than a screening.

• Managed shingle beach. The natural shingle ridge is the primary defence; it is re-profiled and recharged to keep its crest height.
• Timber groynes. These trap and hold shingle along the frontage, slowing the drift that would otherwise thin the beach near Cliff End.
• Secondary embankment. An earth bank between Winchelsea Beach and Rye Harbour gives a second line of defence behind the beach.
• 200-year standard. The 2009 scheme lifted the frontage to a 1-in-200-year standard of protection, but residual risk behind the defence remains.

A history of flooding in Winchelsea Beach

This stretch of coast has a long record of the sea reaching inland. The clearest way to understand the risk is to look at the surge events that have shaped the defences.

• 1953 East Coast flood. The North Sea surge on the night of 31 January to 1 February 1953 remains the benchmark event for the English coast, causing widespread flooding and more than 2,000 deaths across the affected countries, and prompting the modern approach to sea defence that shaped this frontage.
• December 2013 storm surge. The surge of 5 to 6 December 2013 produced some of the highest sea levels on record around the English coast, with breaching and overtopping of shingle and earthen banks in exposed places, and the most severe recent test of coastal defences of this type.
• Ongoing management. There is long-standing local concern that the shingle belt can be drawn down near Cliff End, where the beach narrows, which is why the Environment Agency actively recharges and re-profiles the frontage.

These dated events are not history for its own sake. They set the design standard the defences are built to, and they are the scenarios a flood risk assessment has to keep a development safe against, allowing for climate change over the lifetime of the building.

Planning and drainage policy for a flood risk assessment in Winchelsea Beach

Winchelsea Beach falls within Rother District, so the local planning authority is Rother District Council and the Lead Local Flood Authority is East Sussex County Council. A planning application here is judged against national policy in the NPPF and its Planning Practice Guidance, and against Rother's own Local Plan. Because so much of the village is in Flood Zone 3, the flood-risk tests carry real weight.

• The sequential test. National policy steers development towards lower-risk land first. In a village largely in Flood Zone 3, an application often has to work through the sequential and, where needed, exception tests to justify the location. Our note on what the sequential and exception tests involve sets this out.
• Rother's Local Plan. The adopted Core Strategy directs development away from areas at risk and applies the sequential approach; the emerging Rother Local Plan is being informed by an updated Strategic Flood Risk Assessment prepared by JBA Consulting with the Environment Agency, East Sussex County Council and the drainage board.
• Climate change allowances. Assessments must apply the Environment Agency's climate change allowances for sea level rise and peak rainfall, which push future flood levels above today's.
• Drainage and the IDB. Surface-water drainage must follow the SuDS hierarchy, meet East Sussex County Council's standards as LLFA, and, where works affect a board-managed watercourse, obtain consent from the Romney Marshes Area Internal Drainage Board.
• Flood zones. Which flood zone a site sits in, on the Environment Agency's Flood Map for Planning, sets the starting point for what the application has to demonstrate.

What development needs a flood risk assessment in Winchelsea Beach

Because the village sits mostly in Flood Zone 3, a flood risk assessment is required for most development beyond the very smallest works, and surface-water risk or a site over one hectare can trigger one even in lower-risk pockets. Our guide to when you need a flood risk assessment covers the national triggers; locally, these are the common cases.

• New and replacement homes. Rebuilds, replacement dwellings and infill plots on Pett Level Road and around the village almost always sit in Flood Zone 3 and need a site-specific assessment with finished floor levels and safe access.
• Holiday and caravan parks. The established caravan and holiday sites around Winchelsea Beach raise questions about the safety of overnight occupants in a flood, and changes of use or occupancy periods are assessed on that basis.
• Extensions and outbuildings. Even smaller works can need a proportionate assessment where they are in Flood Zone 3 or add bedrooms at ground level.
• Commercial and agricultural buildings. Development on the marsh and along the coast needs drainage that respects the high water table and the IDB system, as well as flood safety.
• Property purchase and lending. Buyers, mortgage lenders and insurers often want a flood risk survey for a property purchase before committing, given the tidal setting.

How Unda helps with flood risk in Winchelsea Beach

Unda are experts on this kind of coast. We have prepared flood risk assessments and drainage strategies for low-lying and defended sites across East Sussex, and we know how the Environment Agency, East Sussex County Council and Rother District Council approach tidal risk behind defences. We read the Environment Agency data for the specific site, model flood levels and breach scenarios where the national maps are not enough, and design proportionate mitigation (finished floor levels, safe access and egress, flood resilience and compensatory measures) in a report that planners and the Environment Agency accept. Since 2014 we have completed more than 5,000 assessments, a senior flood risk consultant signs off every report, and we stay involved past the report to answer any objection. You can read more about Unda and our flood risk consultants.

For sites near Winchelsea Beach, it also helps to see the wider picture. Our flood risk assessment in East Sussex guide covers the county context, and our flood risk assessment in Hastings guide covers the nearest town along the coast. You can browse every location we cover on our areas hub.

Flood risk assessments for every situation in Winchelsea Beach

People need a flood risk assessment or a drainage strategy for many reasons: securing planning permission, buying a home, satisfying a mortgage lender or insurer, achieving a BREEAM rating, or designing the drainage for a new scheme. It helps to keep three things separate. 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 the right report for the situation in Winchelsea Beach.

• Flood risk assessment for planning. The core report for a planning application in Flood Zone 2 or 3, or where surface-water risk is flagged. See flood risk assessment for planning.
• Property purchase and homebuyer. A flood risk survey for a property purchase for buyers, lenders and conveyancing.
• Insurance. A flood risk assessment for insurance where cover has been restricted, declined or priced on flood risk.
• BREEAM. A BREEAM flood risk assessment structured around the flood and surface-water credit.
• Sequential and exception tests. The locational sequential and exception tests that a Flood Zone 3 site often needs.
• Drainage strategy and SuDS. A surface-water drainage strategy, the discharge of drainage conditions, and preliminary drainage design for the surface-water side.
• Flood modelling. Where the national maps are not enough, flood modelling derives accurate levels, extents and breach behaviour to feed the assessment.

Designing drainage on the marsh is its own challenge, given the high water table. Our free geology and ground conditions checker, drainage calculators and BRE 365 infiltration rate calculator give a quick, defensible first pass before a scheme is fixed.

Local flood risk management and emergency contacts

Several bodies share responsibility for flood risk around Winchelsea Beach. Knowing who does what is useful for both planning and emergencies.

To check conditions yourself, the Environment Agency's Winchelsea, Winchelsea Beach and Pett Level flood warning area shows current alerts, and you can watch the tidal rivers on our live river levels map. East Sussex County Council, as Lead Local Flood Authority, is the body to tell about surface-water and ditch flooding; our note on the role of Lead Local Flood Authorities explains what they do in planning.

Frequently asked questions