Anora
Project

Urban Flood Risk & Runoff Impact Assessment

Quantify how urbanisation and extreme rainfall increase flood risk and drainage stress.

Flood risk classification map showing spatial variation in exposure across urban wards
Building- and ward-level flood risk classes derived from land-use, drainage, and rainfall indicators

Objective

Understand how rapid urbanisation and extreme rainfall increase flood risk in fast-growing Indian cities.

What we did

We combined satellite-derived land-use change, impervious surface growth, rainfall statistics, and GIS-coupled hydrological models (e.g. SWMM, HEC-HMS). Sentinel-1 radar imagery was used to capture flood extent during extreme rainfall events, including under heavy cloud cover.

Outcome

  • Flood hazard and flood risk maps
  • Identification of high-risk wards
  • Quantified impact of urban growth on runoff and drainage stress
  • Evidence to support drainage upgrades and land-use controls
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