Flood Risk Assessment in Bridgnorth

Bridgnorth is a town built on two levels. A red sandstone cliff splits it into High Town, gathered around the ruined castle keep, and Low Town, pressed hard against the River Severn below. It is Low Town that decides almost everything about flood risk assessment in Bridgnorth. We prepare flood risk assessments here for planning, property purchase, mortgage and insurance, and BREEAM, alongside sequential and exception tests and surface-water drainage strategies, for sites on both sides of the cliff.

By the time the Severn reaches Bridgnorth it has already gathered the Rea Brook and dozens of smaller Welsh and Shropshire tributaries upstream at Ironbridge and Shrewsbury. Two further watercourses join close to the town: the River Worfe, which meets the Severn just north of Low Town, and the Tiddle Brook, which drains the higher ground south-west of the town before joining the Mor Brook and then the Severn. Surface water on Bridgnorth's steep streets and groundwater held in the sandstone add further complexity on sites away from the riverbank. We deal directly with the Environment Agency and Shropshire Council on every source, whatever the reason your report is needed.

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

The Severn at Bridgnorth reached 5.26 metres on 2 November 2000 — its highest level on record — and Low Town has come within 36cm of that mark since, most recently in January 2024.

• Low Town sits directly on the Severn. High Town, up on the sandstone cliff, is largely clear of river flooding, so almost every riverside site with a serious flood risk in Bridgnorth is in Low Town.
• The Severn's record level is 5.26m. Recorded at the Bridgnorth gauge on 2 November 2000; the January 2024 flood peaked at 4.9m, only 36cm below it.
• Shropshire Council is the Lead Local Flood Authority. The unitary council leads on surface water, groundwater and ordinary watercourses, and is also the local planning authority that decides your application.
• Bridgnorth has no permanent flood defences yet. Unlike Shrewsbury and Ironbridge upstream, a scheme to protect more than 100 Low Town properties has been discussed with the Environment Agency since 2020 but remains unfunded.

Check flood risk anywhere in Bridgnorth

Bridgnorth is outlined below. Screen any postcode in and around 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 flood risk assessment for planning.

Why Bridgnorth floods: the Severn, the Worfe and the Tiddle Brook

Fluvial flooding from the River Severn is the dominant risk in Bridgnorth, and it is concentrated almost entirely in Low Town. The River Worfe and the Tiddle Brook add localised risk at the town's northern and south-western edges, surface water affects the steeper streets on both sides of the cliff after heavy rain, and groundwater held in the sandstone complicates soakaway drainage on higher ground.

• The River Severn. Draws on a huge upland catchment reaching back into mid-Wales; after heavy rain or snowmelt the flow arrives at Bridgnorth already swollen by the Vyrnwy, the Perry and the Rea Brook upstream.
• The River Worfe. An ordinary watercourse that joins the Severn just north of the town, adding localised flood risk to sites near the confluence.
• The Tiddle Brook and Mor Brook. Drain the higher ground south-west of Bridgnorth, including the Tasley area, before joining the Severn downstream of the town.
• Surface water and groundwater. Intense rain overwhelms drains on Bridgnorth's steep streets on both levels, while the sandstone beneath High Town holds groundwater that can affect soakaway-based drainage. See our note on groundwater flooding.

Where a site sits within Bridgnorth changes which of these sources actually matters. Our notes on the sources of flood risk and on fluvial flooding set out how these interact, and the wider county picture sits on our flood risk assessment in Shropshire page.

A history of flooding in Bridgnorth

These dated events are why Shropshire Council scrutinises Low Town development so closely, and why a flood risk assessment in Bridgnorth has to be evidence-led rather than generic. The record comes from the Environment Agency's own gauge on the Severn at Bridgnorth, which has tracked the river continuously since the 1980s.

• 1998 and 2002. Bridgnorth flooded in both years, part of a run of wet winters that put Low Town under water repeatedly through the 1990s and early 2000s.
• 2 November 2000 — the record. The Severn peaked at 5.26m at the Bridgnorth gauge, the highest level ever recorded at the station, flooding Riverside, Severnside and the other low-lying streets.
• Summer 2007. Renewed flooding across the Severn valley washed away the approach road at Hampton Loade and closed the Severn Valley Railway line out of Bridgnorth station after landslips.
• February 2020. Storms Ciara and Dennis in quick succession pushed the Severn to some of its highest levels since 2000 through the town.
• January 2024 — Storm Henk. The river peaked at 4.9m on 5 January, just 36cm short of the 2000 record, flooding Riverside, Severnside, Severn Park and the rugby club pitch, and closing the A442.

Unda's deep dive, Resilience by Repetition: 25 Years on from the 2000 Severn Floods, traces how Bridgnorth's neighbours Ironbridge and Bewdley rebuilt their defences flood by flood across the quarter-century since 2000 — a pattern Bridgnorth itself is still working through.

Flood defences and the case for protecting Low Town

Unlike Shrewsbury's Frankwell scheme or Ironbridge's demountable barriers, Bridgnorth currently has no permanent flood defences. More than 100 Low Town properties have been identified as being at high risk, and Shropshire Council, the Environment Agency, Severn Trent Water and Bridgnorth Town Council have discussed a protection scheme since 2020 — but a fully funded scheme has yet to be confirmed.

No permanent scheme yet protects Low Town: more than 100 at-risk properties currently rely on warning time and temporary measures rather than a flood wall.

For a flood risk assessment, the absence of a scheme actually simplifies one part of the picture: there is no defended standard of protection to test residual risk against, so present-day Flood Zone mapping applies without the "what if the defence failed" question that a Frankwell-style wall introduces upstream. If a scheme for Bridgnorth does eventually go ahead, any site-specific assessment prepared before it is built will need revisiting against the new defended condition. Flood wardens, additional river gauges and warning sign-up for the Worfield area have all been discussed as interim measures alongside the wider scheme.

Planning policy and drainage requirements in Bridgnorth

Shropshire Council is the Lead Local Flood Authority for Bridgnorth, leading on surface water, groundwater and ordinary watercourses such as the Worfe and the Tiddle Brook, while the Environment Agency remains responsible for the Severn as a main river. As the unitary authority, Shropshire Council is also the local planning authority that determines your application, so a developer here deals with one council for planning and for local flood risk alongside the Environment Agency.

The clearest illustration of how this works in practice is Tasley Garden Village, the 1,500-home development approved on Bridgnorth's south-western edge in February 2026 after extended consultation. The council's Strategic Flood Risk Assessment for the site (BRD030) confirmed that 94% of the 128-hectare site sits in Flood Zone 1, with the Tiddle Brook and Mor Brook catchment posing fluvial and surface-water risk only along the western boundary; groundwater flooding is flagged as a concern that is likely to rule out infiltration-based SuDS across parts of the site. It is a real, current example of how the Sequential and Exception Tests, a site-specific flood risk assessment and a drainage strategy work together on a Bridgnorth-scale scheme.

What your flood risk assessment in Bridgnorth must show

• Risk assessed from every credible source, using the Flood Map for Planning, the Shropshire SFRA and local data such as the Bridgnorth gauge record.
• An appropriate location, tested against the Sequential Test where policy requires it, as Tasley Garden Village had to demonstrate.
• Safe for its lifetime, once the climate change allowances are applied.
• No increase in flood risk elsewhere, with attenuation and, where needed, compensatory storage on the floodplain.
• Residual risk managed, with safe access, egress and finished floor levels above the design flood level plus freeboard.

Development and flood risk assessment in Bridgnorth

Bridgnorth's growth splits fairly cleanly between the historic core and its edges, and the site you bring forward shapes the assessment you need. Getting the scope right the first time is the difference between a clean approval and a drainage objection that holds an application up for months.

• Low Town riverside conversions. Change-of-use and refurbishment schemes along Riverside and Severnside sit directly in Flood Zones 2 and 3, needing finished floor levels, safe access and egress, and often compensatory flood storage.
• High Town infill. Development within the conservation area around the castle and the Cliff Railway turns on surface water and the sandstone's groundwater rather than the river, with limited scope to alter drainage patterns on a heritage street.
• Edge-of-town growth. Tasley Garden Village and smaller greenfield sites on Bridgnorth's slopes hinge on the Tiddle Brook, Mor Brook and surface water, where a sustainable drainage strategy carries the application.
• Rural and riverside sites. Barn conversions and new builds around Quatford, Eardington and the Severn Valley Railway corridor, including working sites like Daniel's Mill, often hinge on an ordinary watercourse or surface water rather than the main river.

Climate change is not optional here. A Bridgnorth assessment must apply the Environment Agency's allowances for higher river flows and rainfall over the development's lifetime — generally 100 years for housing — which sets floor levels, freeboard and how much attenuation a drainage scheme needs. Home buyers and businesses come to us too: a flood risk question can affect a purchase and its price, and a conveyancing search is not the same thing as a planning-grade assessment. Our guide on whether you can do your own assessment explains where the line falls.

How Unda helps with flood risk assessment in Bridgnorth

We act as the accurate translation layer between your scheme and the requirements set by the Environment Agency, Shropshire Council and national planning policy. We are experts on Bridgnorth's flooding, not a generic report mill.

A flood risk assessment in Bridgnorth from Unda assesses every credible source — the Severn, the Worfe, the Tiddle Brook and other ordinary watercourses, surface water and groundwater — compares modelled flood levels against your proposed floor levels, sets safe access and egress, and recommends mitigation the regulators will accept. We are a CIWEM Business Partner with chartered members, and a senior consultant signs off every report. 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 Bridgnorth

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, 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 Shropshire 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 Severn or surface-water 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 after a flood near the river.
• 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. A defensible design water table for sites on the Bridgnorth sandstone and any basement, assessed as a source within the FRA, or as a standalone hydrogeological assessment on complex sites like Tasley.

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. Tasley Garden Village's own sequential approach, steering the great majority of the scheme into Flood Zone 1, is a working example of how this plays out on a Bridgnorth-scale site — a live policy area, as our note on the Sequential and Exception Tests explains.

Drainage strategy and SuDS

• Sustainable drainage strategy (SuDS). Surface-water engineering that calculates existing versus proposed runoff and proposes SuDS to hold discharge within Shropshire Council's standards, following the four pillars of SuDS.
• Preliminary drainage design. The early, outline read that flags infiltration issues before they affect layout and land value — important where, as at Tasley, groundwater rules out simple soakaways.
• 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 of the Severn is not detailed enough.

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, informed by our note on when infiltration testing is required, 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.

Bridgnorth flood risk management and emergency contacts

The most reliable Bridgnorth 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 Bridgnorth. Live Environment Agency warnings and the Bridgnorth river-level gauge at check-for-flooding.service.gov.uk, including the River Severn level at Bridgnorth and the river and sea levels for the area; sign up for flood warnings or call Floodline on 0345 988 1188.
• Severn at Bridgnorth flood warning area. The Environment Agency's target area for the town is published at check-for-flooding.service.gov.uk.
• Shropshire Council flood risk and planning policy. Strategy, SuDS guidance and the Bridgnorth Level 2 SFRA site summaries at shropshire.gov.uk.
• Report a flooding issue. Surface water and ordinary watercourse problems to Shropshire Council as Lead Local Flood Authority.
• Regional and emergency planning. Shropshire sits within the English Severn and Wye Regional Flood and Coastal Committee, which oversees catchment-scale investment, and the West Mercia Local Resilience Forum, which coordinates the emergency response to a major flood.
• Live river levels. Whether the Severn is running high right now near a postcode via our live river levels map.

For flooding from blocked or burst sewers, contact Severn Trent Water. For broader policy context, our notes on the Environment Agency's planning role, on the role of the LLFA and on the Whitchurch canal breach elsewhere in Shropshire are a good starting point for how infrastructure and residual risk are weighed locally.

Flood risk assessment in Bridgnorth: frequently asked questions