Flood Risk Assessment in Burnham-on-Crouch

A flood risk assessment in Burnham-on-Crouch is mostly about the tide. The town faces the River Crouch about four miles from the open sea. Its quay, the riverside end of the High Street and the streets along the water sit behind an Environment Agency flood wall, and on the agency's 2017 figures the crest is barely above today's 1 in 200 tide. We prepare flood risk assessments, sequential and exception tests and surface water drainage strategies for sites across the town, for planning, purchase, insurance and lending.

On this page Burnham-on-Crouch means the built-up area as the Office for National Statistics maps it. That takes in the waterfront and town centre, the Victorian streets around Station Road and the later estates north towards Stoneyhills, all in the CM0 8 postcode sector and in Maldon district. Burnham Wick, Creeksea, Ostend, Southminster and Althorne lie outside the outline. The same estuary, council and drainage rules apply to them, and to the rest of the Dengie peninsula out to Bradwell-on-Sea.

In 2017 the Environment Agency put the effective crest of Burnham's flood defence at 4.7 m AOD and the present-day 1 in 200 tide at 4.56 m AOD, a margin of 14 cm before any allowance for sea level rise.

To talk through a Burnham-on-Crouch site, call our flood risk consultants on 01293 214444 or email enquiries@unda.co.uk. Reports for sites in Burnham-on-Crouch come from Unda Consulting Limited, a CIWEM Business Partner.

Is Burnham-on-Crouch in a flood zone? About a sixth of the town is

Around 16% of Burnham's built-up area is in Flood Zone 3 and about 1% more in Flood Zone 2, from our October 2026 check of the Environment Agency's Flood Map for Planning against the ONS outline. Almost all of that land is a narrow riverside strip. North of the High Street the ground rises and most of the town, including the station and the estates beyond it, is in Flood Zone 1.

• The waterfront. The Quay, Shore Road, Coronation Road and Remembrance Avenue on the western side, and Providence, Riverside Road and Belvedere Road to the east, fall in Flood Zone 3, along with parts of the High Street nearest the river.
• The middle of town. Station Road, Albert Road, Western Road, Crouch Road and Mildmay Road sit on Flood Zone 1 ground, with a short stretch of Silver Road in Flood Zone 2.
• The northern estates. Glendale Road, Church Road and the newer housing towards Maldon Road and Southminster Road are in Flood Zone 1, where the questions are surface water and drainage rather than the tide.
• Just outside the outline. The low ground around the Dengie Hundred Sports Centre and Burnham Wick along Wick Road are Flood Zone 3. The Environment Agency's warning area for the town runs between the two.

Flood Zone 3 here is tidal, and it is defended. JBA Consulting finished Maldon's Level 1 Strategic Flood Risk Assessment in December 2024. It names Burnham-on-Crouch as one of the two main tidal risk areas on the Crouch, and records the district's longest stretch of flood wall here. Defended or not, the zone still applies for planning, which is why a riverside site needs a site-specific assessment that deals with the wall overtopping or failing.

Look up a Burnham-on-Crouch postcode on the map

The coral line on the map follows Burnham's built-up area. Enter a postcode to see the planning flood zone, the risk from the sea and from surface water, and any warning in force; our flood risk map covers the rest of England in the same way. Both are a first screen, not an assessment of a building.

The wall along the Crouch, and the tide it has to hold

The Environment Agency owns and maintains the sea wall in front of Burnham. When it advised on a riverside application in 2017, it set out the levels that still frame any assessment on the waterfront. The figures below come from that advice, recorded in Maldon District Council's committee report of 17 July 2017 for land at Remembrance Avenue.

Whether the wall is raised depends on the shoreline plan and on money. The Essex and South Suffolk Shoreline Management Plan holds the line in front of the town (unit H1) and along the frontage west towards The Cliff (unit H2A1) in every period to 2105. Both entries warn that justifying the cost will be challenging and that a partnership approach may be needed. Our explainer on how shoreline management plans work sets out what a hold the line policy does and does not promise.

That gap between today's margin and the 2107 level drives the design of a waterfront home. It has to stay safe for its lifetime even if the wall is never raised. So bedrooms go above the breach level, and the assessment sets out how people leave, or stay safe upstairs, when a surge is forecast. The opposite bank is managed differently. At Wallasea Island, in Rochford district, 115 hectares of farmland were opened to the tide at Jubilee Marsh in 2015, built up with about three million tonnes of earth from the Crossrail tunnels, according to the Institution of Civil Engineers. The town's community website points out that the Burnham wall is higher than the south bank's, so a big tide floods the Wallasea wetlands first.

Floods recorded in Burnham-on-Crouch since 1953

Burnham's recorded floods split into two kinds: the sea getting past or through the defences, and rain the drains could not carry. The entries below come from the 2024 SFRA, Essex County Council's flood investigations and Environment Agency records.

1. 31 January 1953. The North Sea surge recorded a flood level of 14.75 feet at Burnham-on-Crouch, according to an Environment Agency booklet published for the 60th anniversary. Film held by the East Anglian Film Archive shows flooded streets, sandbags at doorways and men repairing a breach in the sea wall the next day. Our account of the 1953 North Sea flood covers the night along the whole coast.
2. 6 December 2013. During the east coast surge, a floodgate failed and water escaped at Kings Wharf, flooding nearby streets, as the SFRA records.
3. August 2015. Heavy rain gathered where Brickwall Close meets Station Road and several homes flooded inside. Essex County Council investigated under Section 19 and noted earlier flooding at the same spot.
4. February 2022. Storm Eunice damaged the town's public pontoon beyond repair. The Environment Agency surveyed the sea wall and the Town Steps that year and found them stable, Maldon District Council reports.
5. 25 October 2026. The Environment Agency issued a flood alert for the evening high tide across the Crouch and Roach estuaries, naming Burnham-on-Crouch, Creeksea Ferry Road and Wallasea Island among the places at risk.

The Environment Agency lists a rain gauge at Burnham. It has no river or tide gauge in the town. Our live river levels map shows the gauges that do report across Essex, and the warning service is the quicker guide to a coming tide.

Behind the wall: rain, sewers and groundwater in the CM0 streets

Burnham's drains empty into a tidal river. Outfalls into the Crouch close at high water, and rain that falls while a big tide is in backs up in the pipes and ditches until the water drops. The 2024 SFRA also picks out constrained surface water routes through the town, a cluster of sewer flooding reports and ground where groundwater is likely to rise.

For drainage, Essex County Council is the Lead Local Flood Authority, and its SuDS Design Guide of February 2020 has a rule that matters on the Crouch. Where a site drains to a tidal estuary, the discharge rate can be left unrestricted. The strategy must then show that the 1 in 100 year storm plus climate change can be managed while a 1 in 20 year tide holds the outfall shut. In practice the storage has to hold a full storm with the outfall shut. Elsewhere the council expects runoff held to the 1 in 1 year greenfield rate. Infiltration is tested before it is assumed, and our soakaway and ground conditions tool gives a first idea of the ground before any trial pit.

What Maldon's plans ask of a flood risk assessment in Burnham-on-Crouch

Maldon District Council decides planning applications in Burnham-on-Crouch under its Local Development Plan 2014 to 2029, approved on 21 July 2017. It also applies the Burnham-on-Crouch Neighbourhood Development Plan, made after a referendum on 13 July 2017. Essex County Council comments on surface water and the Environment Agency on the tide. They are separate consultations.

The council is reviewing its plan. The latest stage on its review page is the Issues and Options consultation of early 2022, so the 2017 policies remain the ones applied. Our Maldon District Council page covers the council's wider requirements, and our summary of the August 2026 NPPF changes explains chapter 18.

How Burnham applications in Flood Zone 3 have been judged

Council reports from 2017 and 2020 show the sequential test, more than the flood levels, deciding waterfront applications in Burnham. In the two refused schemes below the Environment Agency raised no flood objection. Officers still recommended refusal, because the search for lower-risk sites did not satisfy them.

• 2013, the former Cefas laboratory. Housing on the former fisheries laboratory site south of Remembrance Avenue was approved at a time when the council could not show a five-year housing land supply, as the 2017 report records.
• 2017, two houses on Remembrance Avenue. The flood risk assessment gave no alternative sites, and officers took the view that lower-risk land was available across the district. Ground floors at 2.17 m AOD would have sat about 3 m below the breach level, with first floors at 5.40 m AOD as refuge.
• 2020, the former Petticrows boatyard on the Quay. A 0.75 hectare retirement housing scheme searched within 800 m of the town centres of Burnham, Maldon and Heybridge, an approach an officer had agreed in writing. Officers did not accept that no other site was available. The report accepted that refuge on upper floors, above a breach that would flood Belvedere Road, could make the building safe.

The lesson for a riverside site is to settle the area of search and the evidence for testing alternative sites before the design is fixed, and to show refuge above the breach level. Our guide to residual flood risk explains how breach and overtopping are assessed behind a defence.

When does a scheme call for a flood risk assessment in Burnham-on-Crouch?

Three things decide it: the flood zone, the size of the site and what the building will be used for. The table covers the schemes that come up most in Burnham; the postcode map above gives the zone.

Whatever the zone, ask early whether the sewer can take the flows, because Anglian Water's view and the Neighbourhood Plan's capacity policy can delay a Burnham scheme as much as the flood evidence. Our guide on building an extension in a flood zone covers the smaller cases.

Reports for the Quay, the town centre and the estates north of Station Road

People commission flood work in Burnham-on-Crouch to build, buy, insure, lend on or run a business by the estuary. A flood risk assessment asks whether the site is safe, the sequential test whether it should be there at all, and a drainage strategy where the water goes, so one application often needs more than one.

• Applications to Maldon District Council. New homes, extensions and changes of use on the waterfront need a flood risk assessment for planning that answers Policy D5 and shows refuge above the breach level.
• The tide, the rain and the sewers together. A flood risk assessment for a Burnham site weighs overtopping and a breach of the wall against tide-locked drains, surface water and groundwater, then sets floor levels and a way out.
• Buying by the river. Searches on the Quay, Riverside Road or Belvedere Road flag Flood Zone 3, and a flood risk survey for property purchase looks at the one building, its floor level and the wall in front of it.
• New homes in Flood Zone 3. Burnham's recent waterfront refusals turned on the search for lower-risk sites, so the sequential and exception test starts from an area of search the council will accept.
• Every scheme that adds hard surfaces. Neighbourhood Plan EN.2 asks that runoff does not raise flood risk on or off site, and a drainage strategy shows how that is met.
• Sites draining to the Crouch. A surface water drainage strategy for Essex County Council proves the 1 in 100 year storm plus climate change can be held while a 1 in 20 year tide keeps the outfall shut.
• After permission. Permissions on the edge-of-town allocations carry drainage conditions, and the discharge of drainage conditions brings the calculations, maintenance plan and Essex SuDS proforma together for sign-off.
• Living behind the wall. Homes and retirement schemes between Wick Road and the sports centre fall in the Burnham-on-Crouch warning area. A flood warning and evacuation plan ties its warnings to refuge floors and routes out, as the flood plan for the 2020 Petticrows scheme did.
• Breach depths on the waterfront. Where the SFRA's breach mapping is too coarse for one plot, site-specific flood modelling gives depths, speeds and hazard for the Environment Agency's breach guidance.
• Homes with a flood history. Homes flooded inside at Station Road in 2015, and riverside property is in Flood Zone 3, so a flood risk assessment for insurance gives an insurer the levels the national data lacks.
• Boatyards and waterfront land. Yards, wharves and marina land on the Quay change hands with redevelopment in mind, and flood risk due diligence sets out the tidal and planning risk before a deal.
• Yacht clubs and businesses on the Quay. The 2013 floodgate failure at Kings Wharf flooded nearby streets, and a business continuity flood risk assessment plans for the next surge.
• The ridge towards Bradwell. The SFRA maps groundwater close to the surface along the higher ground and a rising groundwater zone by 2125, so a groundwater flood risk assessment matters for basements and soakaways.
• Sewer capacity. Neighbourhood Plan PI.19 asks every scheme to show the sewers and the water recycling works can cope, and a foul drainage strategy answers it.
• Employment land. Policy S6 provides for an extension to the Burnham Business Park, and commercial buildings seeking certification need a BREEAM flood risk assessment for the Pol 03 credit.

Who to call about the sea wall, the drains and flood warnings in Burnham

Responsibility in Burnham is split by the source of the water. The Environment Agency deals with the tide and the wall, Essex County Council with surface water and ditches, Anglian Water with the sewers, and Maldon District Council with planning.

Two Environment Agency messages cover the town. The Burnham-on-Crouch warning area covers the town from Wick Road to the Dengie Hundred Sports Centre, including the High Street. The wider Crouch and Roach flood alert covers the Essex coast from St Peter's Flat to Shoeburyness and both estuaries, so it is issued more often, typically warning of high tides over coastal roads and car parks.

Questions on building, buying and draining land by the Crouch at Burnham

Unda Consulting Limited prepares flood risk assessments, sequential and exception tests and drainage strategies for homes, boatyards, businesses and development land in Burnham-on-Crouch and across the Dengie peninsula. Our pages for Maldon, on the Blackwater, and Rochford, across the Crouch, cover the neighbouring towns. Our Essex page covers the county, our River Crouch page follows the estuary from Wickford to the sea, and the areas we cover list the rest. Call 01293 214444 or email enquiries@unda.co.uk.