Flood Risk Zones
Definition
Flood Risk Zones are mapped areas identified as likely to experience flooding due to rainfall, river overflow, or sea-level rise. GIS combines hydrological models, elevation data, and land use to delineate these zones.
Application
Insurance companies price premiums, planners regulate development, and emergency teams create evacuation plans. Risk zones are updated with real-time data and scenario models. FEMA, UNEP, and EU use GIS extensively for flood resilience planning.
FAQ
1. How are risk zones determined?
By overlaying rainfall, runoff, DEMs, land use, and drainage models.
2. How are risk zones determined?
Estimates of flood frequency (e.g., 1-in-100 year events).
3. How are risk zones determined?
Governments, NGOs, developers, insurers, and utility providers.
4. How are risk zones determined?
Historical floods, terrain, soil infiltration, infrastructure, and hydrological parameters.
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