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
How are risk zones determined?
By overlaying rainfall, runoff, DEMs, land use, and drainage models.
What are flood return periods?
Estimates of flood frequency (e.g., 1-in-100 year events).
Who uses flood risk maps?
Governments, NGOs, developers, insurers, and utility providers.
What data is critical?
Historical floods, terrain, soil infiltration, infrastructure, and hydrological parameters.
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