Floodplain Mapping
Definition
Floodplain Mapping involves identifying low-lying areas adjacent to rivers or coasts that are prone to flooding. GIS tools model water flow, elevation, and flood scenarios to delineate flood extents and depths.
Application
Zoning regulations limit construction in floodplains. FEMA and UN agencies publish flood maps for planning and insurance. GIS models river overflow and coastal surge to assess impact under different rainfall or sea-level conditions.
FAQ
1. Why map floodplains?
To reduce flood damage, protect life and property, and guide sustainable land use.
2. Why map floodplains?
Using hydrologic models (HEC-RAS, SWMM), terrain data, and historical flood records.
3. Why map floodplains?
Inundation maps, risk zones, depth grids, and hazard curves.
4. Why map floodplains?
Urban planners, insurers, developers, and environmental agencies.