Drone Flood Risk & Hydraulic Surveys.
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Compare quotes from specialist UK drone operators for high-resolution DTMs feeding TUFLOW / HEC-RAS, drain and culvert capacity inventories, SUDS design surveys, and rapid post-flood damage documentation.
“For every verified profile, we record the insurance and CAA credentials supplied at the time of review.”
Peter Leslie · Founder & GVC Drone Pilot
Trusted by site managers & agencies across the UK
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Drone flood risk survey specialisms
Aerial evidence for FRAs, drainage design and post-event damage reporting.
Flood plain mapping
High-resolution DSM/DTM outputs for flood modelling and planning FRA submissions.
Get FRA mapping quotesCulvert & drainage mapping
Capture of ditches, culverts, outfalls and SuDS features for drainage strategy reviews.
Request drainage surveyPost-flood damage capture
Rapid post-event aerial survey for insurance claims and recovery planning.
Get damage survey quotesFree LIDAR is not good enough for a 1:100 FRA.
Flood-risk consultants, drainage engineers, and loss adjusters need ground-truth topography. The Environment Agency's national LIDAR composite is a superb starting point — but not a finishing one.
Composite LIDAR Is Too Coarse
EA LIDAR Composite at 1 m or 2 m resolution is fine for catchment-scale modelling but smooths out kerb lines, low boundary walls, and garden features that absolutely govern surface-water behaviour on a single development site.
Drain & Culvert Capacity Unknown
Most local-authority culvert and gully records are incomplete or decades out of date. A drone orthomosaic with an annotated inventory fills the gap in hours, letting drainage engineers model real-world capacity, not paper capacity.
Slow, Expensive Post-Flood Adjusting
Loss adjusters and engineers arriving a week after the event find evidence already washed away. A rapid-response drone flight creates a dated, defensible record of damage extent, freeboard, and debris lines while they are still visible.
FRA deliverables have to line up with EA data.
By Peter Leslie, Founder & GVC Drone Pilot
Connect on LinkedInA flood-risk assessment is only as defensible as the topographic base it sits on. If the drone DTM doesn't tie into OSGB heights, or doesn't mesh with the EA's flood map boundaries, the modeller has to start again.
Every flood-risk survey on this network is flown by drone operators delivering DTMs in OSGB36 / ODN, co-registered to EA LIDAR, with documented accuracy and residuals. Drop it straight into TUFLOW, HEC-RAS, or InfoWorks ICM.
The result is a topographic dataset the Lead Local Flood Authority, the EA, and the developer's insurer can all agree on.
OSGB36 / ODN Aligned
PDRA01 & £5M Public Liability
Topography your hydraulic modeller can use.
Our network operators deliver survey-grade topography and evidence packs ready for FRA submission, drainage design, and insurance claims.
High-Resolution DTMs
Bare-earth DTMs at 5–10 cm GSD, supplied as GeoTIFF or LAS point cloud. Co-registered to OSGB36 / ODN so they drop straight into TUFLOW, HEC-RAS, InfoWorks ICM, or MIKE without reprojection.
Drain & Culvert Inventories
Annotated orthomosaics locating every gully, inlet, culvert headwall, and outfall across the study area. Dimensions and condition notes captured at site, feeding straight into the drainage schedule.
Post-Flood Damage Reports
Rapid-response flights capture debris lines, freeboard against fixed structures, and damage extent before evidence is lost. Dated orthomosaics and annotated reports hold up under insurer and tribunal scrutiny.
Book your flood-risk survey in 3 steps.
Submit one brief. We aim to review it within one working day, then introduce relevant independent specialists who can assess the project.
Describe the Catchment
Tell us the site, the purpose (FRA, drainage, SUDS, post-flood), and the modelling package the output will feed. Takes under two minutes.
Compare Specialists
We review the brief against relevant verified profiles and current availability. If listed supply is limited, we will say so and source availability manually. Any pilot introduced must confirm equipment, permissions, timing and deliverables for the actual job.
Fly & Deliver
Your drone pilot locks in ground control, flies the catchment, and delivers DTM, contour plan, orthomosaic, and drain/culvert inventory, ODN-referenced.
Flood Risk Survey FAQ
Technical questions on DTMs, modelling, and post-flood mobilisation.
How do drone DTMs align with EA LIDAR and flood maps?
Photogrammetry or LiDAR for hydraulic modelling?
Can you model a 1:100-year event from the survey?
How quickly can you mobilise after a flood event?
Ready to base your FRA on real topography?
Post one structured brief so relevant profiles and current availability can be reviewed.
Start Your Flood Risk Survey Brief
Add the service, full project postcode, timing and project details so we can review a useful brief.
Telephone and budget are optional. Privacy policy.