UK flood risk · reports & modelled assessment

Flood risk reports that show their working.

Whether you’re buying a property or planning a development, we’ll tell you plainly what the flood risk is — using the Environment Agency, Ordnance Survey and BGS’s own published data, modelled properly, and looked over by a competent person where it matters.

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No black box, no borrowed models, no fudged numbers. Every figure in the report can be traced back to the public dataset it came from — ask, and we’ll show you.

Modelled with LISFLOOD-FP (peer-reviewed solver) 0.15 m RMSE vs EA detailed model ≈4 min full modelled FRA Prepared to the Law Society flood practice note Competent-person reviewed

Four products · one engine

The flood and drainage evidence a property needs.

If you’re conveyancing, you need a quick, defensible answer today. If you’re planning or building, you need proper modelled levels. It’s the same engine underneath either way — and a competent person stands behind every conclusion.

Available now

Conveyancing Flood Report

Everything a buyer’s solicitor needs to know about flood risk at a property — a clear Passed or Further Action conclusion, and an opinion you can drop straight into the report on title.

  • Rivers, sea, surface water, groundwater & historic flooding
  • Defended and undefended risk, with climate-change allowances
  • Copy-paste professional opinion & insurability context
  • Prepared to the Law Society flood practice note
  • Back to you in seconds — any property in England
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Validating · early access

Flood Risk Assessment (FRA)

A proper desk-study FRA: your site gets its own 2D hydraulic model, built from EA LiDAR and open catchment data, producing the design flood levels a planning application needs — reviewed and owned by a competent person, as it should be.

  • Modelled 1% AEP design level (mAOD), present-day & climate change
  • Recommended finished-floor level, governed by the higher of level or ground
  • Computed access & egress check on the site’s own flood model
  • Model run in ≈4 minutes at 5 m — the resolution commercial flood maps use
  • Full validation & audit appendix; competent-person sign-off
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In development

Groundwater FRA (GWFRA)

A groundwater flood-risk screening built on the British Geological Survey susceptibility framework, with the geological mechanism explained and the interpretation owned by a competent person.

Groundwater is a distinct hazard — a GWFRA complements a fluvial FRA; the two are not comparable.

  • Three-band BGS susceptibility class at the site
  • Mechanism identified: superficial-deposit vs clearwater flooding
  • Bedrock, superficial geology & aquifer context
  • Where risk is credible: borehole & monitoring recommendation
Register interest
In development

SuDS & Drainage Assessment

A surface-water drainage assessment for planning: greenfield runoff rates, attenuation storage sized across storm durations with climate uplift, and a screened discharge strategy. We size what’s needed; your designer designs it.

  • Greenfield runoff rates (QBAR, Q1 / Q30 / Q100)
  • Attenuation storage sized at the critical storm duration
  • Discharge hierarchy screened: infiltration → watercourse → sewer
  • SuDS component menu with indicative sizing
  • Infiltration flagged for BRE365 testing where it is the route
Register interest

Under the hood

Modelled on real terrain.

None of this is stock imagery. Everything below came out of the engine itself, at a real site — the terrain it runs on, the map it draws, and the access check it works out.

LiDAR hillshade terrain model, Tiverton, Devon
The terrain the model runs on. Environment Agency 1 m LiDAR composite DTM, assembled to the model grid — Tiverton, Devon (EX16). EA LiDAR © Environment Agency, OGL v3
Site setting map on OS Open Zoomstack, Tiverton
The site in its setting. Report figure: location and context on Ordnance Survey Open Zoomstack mapping, generated by the engine for this site. Contains OS data © Crown copyright and database right 2026
Computed access and egress figure over modelled flood extent, Tiverton
The access check, computed. Report figure: the road network assessed against the site’s own modelled 1% AEP flood extent — a named route, a measured limiting depth. OS Open Zoomstack · EA LiDAR · Strata model output

Build your report

Tell us the property. We’ll do the rest.

Pop the postcode in, pick the report you need, and place the order. Searches come back in seconds; a modelled FRA takes a few minutes to run and is issued once the competent person has looked it over.

01 · The property

02 · The report

REF SF-— · Conveyancing Flood Report
Place the order See a sample first

While we finish the self-serve platform, orders arrive by email — the button opens a pre-filled message with everything we need. For reports still in development, the same button registers your interest.

Method

How we get to the answer.

There’s no black box here. Every rating comes from a stated rule applied to a named public dataset — and an FRA gets its own hydraulic model, built with LISFLOOD-FP, the peer-reviewed solver from the academic flood-science world. If you ever want to know where a number came from, just ask.

01

Locate

The property is pinned to Ordnance Survey mapping and the Environment Agency flood datasets at its exact coordinates.

02

Assess

Each flood source is classified deterministically against authoritative data and 1 m LiDAR terrain — and for an FRA, a site-specific hydraulic model is run. No inference, no fitted corrections.

03

Conclude

A stated rule turns the results into a clear conclusion — reviewed and owned by a competent person where the report requires it — with an audit trail behind every number.

The difference

We show the working. Most don’t.

The established providers ask you to take their word for it. We’d rather show you how the answer was reached — it’s better science, and it happens to cost less too.

 Strata FloodEstablished providers
Underlying dataEA, OS & BGS authoritative, OGLLicensed third-party models
TerrainEA 1 m LiDAR sourceGlobal DEM · metre-scale
Every figure traceableYes — to named datasetBlack box
TurnaroundSeconds (search) · minutes (modelled FRA)Days to weeks
ValidationMeasured gauges & EA detailed modelsProvider benchmarks

Validation

Checked against measured truth — not our own marking.

Our modelled levels are checked against the Environment Agency’s own detailed hydraulic models and independent river-gauge records — every run is gated, and any run that fails is kept on file, not quietly binned.

0.15 m
RMSE vs EA detailed hydraulic model
140 model nodes · Paddock Wood
≈4 min
full modelled FRA, coordinate to report
measured · 5 m model grid
2,586
river gauges in the validation set
EA Hydrology, OGL
15.2M
buildings indexed across England
OS Open data, OGL

See it for yourself

A real report, start to finish.

Download a worked example and read it properly — the verdict, the sources, the professional opinion, and exactly where every number came from. Each sample is a real report, stamped as a specimen.

Conveyancing sample (PDF) FRA sample — Tiverton (PDF) GWFRA preview sample (PDF) Book a walkthrough