River-Basin Flood Risk Modelling
Hydro-flattened DEM production and 100-year flood-extent modelling across a 14,000 sq km basin for early warning.
Where the client started
A disaster agency responsible for a flood-prone river basin had hazard maps drawn a generation ago — before embankments moved, channels shifted and hundreds of settlements grew inside the floodplain.
The OutcomeWhere they ended up
The model reproduced historic flood extents with 92% fit. All 620 basin villages now carry depth-based risk ratings, and the agency’s early-warning dashboard issues advisories keyed to the new scenarios.
How we delivered
Hydro-flattened DEM production with breakline hydrography across the full basin
Flow modelling calibrated against three historic flood events with documented fit
100-year and 25-year inundation scenarios with depth grids, not just extents
Village-level exposure assessment joining inundation depth to settlement and population layers
- Basin hydro-flattened DEM
- Calibrated inundation scenarios
- Depth-grid hazard layers
- Village exposure rankings
- Early-warning dashboard layers
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