Hazard classification, social and economic losses in flooded urban areas

Author(s)

Ferreira, Mauricio Jonas ; da Rocha, Humberto Ribeiro

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF DISASTER RISK REDUCTION; v. 120, p. 15-pg., 2025-03-15.

Abstract

The spatial and temporal evolution of hazard maps is crucial for issuing flood alerts and activating contingency plans. Hazard classification maps were generated in the HEC-RAS ((Hydrologic Engineering Center - River Analysis System) model using Depth-Velocity (DV) data. Economic damages and loss of life were estimated in the HEC-FIA (Hydrologic Engineering Center - Flood Impact Analysis) model, calibrated with social and economic data from various government agencies. The study revealed hazardous areas with varying DV values. Regions with H2 (DV <= 0.6) were unsafe for small vehicles, while areas with H5 (DV <= 4.0) posed risks for vehicles, people, and buildings. Areas with H6 (DV > 4.0) were classified as highly hazardous. Direct economic losses were estimated at $376,040.00 for 15 structures, including $213,430.00 for structural damage, $127,990.00 for interior damage, and $34,620.00 for vehicle damage. Between 97 % and 99 % of individuals received warning messages, and all mobilised and nonmobilised individuals survived. (AU)

• FAPESP's process: 21/11762-5 - Centre for Water and Food Security in Critical Zones
• Grantee: Humberto Ribeiro da Rocha
• Support Opportunities: Research Grants - Science Centers for Development
• FAPESP's process: 19/23853-5 - Regional risks and opportunities on land use change and climate change with thermal-water ecosystem services: investigation for basins in Caatinga and Atlantic Forest
• Grantee: Humberto Ribeiro da Rocha
• Support Opportunities: Regular Research Grants