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Application of flood hazard assessment for decision-making in the White Volta Basin, Ghana

Domaine:

geospatialclimate

Type de record:

paper
Créateur:
SamYakThoAnd
Éditeur:
IWA
Hôte:
ABSTRACT HEC-RAS hydraulic model workflow integrating satellite data for flood hazard assessment and district-level risk mapping in the White Volta Basin. Flooding is a major natural hazard in Ghana, with the White Volta Basin (WVB) highly susceptible due to flat terrain, intense rainfall, and upstream dam releases. The September 2020 flood, caused by heavy rainfall and Bagre Dam spillage, inundated croplands and settlements, revealing the need for impact-based flood intelligence. This study uses the Hydrologic Engineering Center's River Analysis System to simulate flood dynamics and assess cropland exposure. Calibration and validation with Sentinel-1 Synthetic Aperture Radar-derived flood extent showed strong spatial agreement (61–77%). A composite flood hazard index, combining water depth and velocity, classified hazard intensity into seven levels, linking hydraulic severity with crop impacts. The framework guides community-level early warning and preparedness, supporting decision-making by the National Disaster Management Organization (NADMO), Ministry of Food and Agriculture (MoFA), Water Resources Commission (WRC), and Ghana Meteorological Agency (GMet). High-risk areas included Bawku West (22.7%), Binduri (15.1%), and Talensi (6.1%), aiding climate-resilient planning in transboundary basins.

Visit

doi.org

Languages

Farefare

Licenses

http://creativecommons.org/licenses/by/4.0/

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