Flood Risk Mapping - Nsanje & Chikwawa

Comprehensive Flood Risk Assessment and Mapping for Nsanje District, Malawi

Nsanje District, located in southern Malawi along the Shire River, experiences recurring seasonal flooding that displaces thousands of residents and devastates agricultural livelihoods. This flood risk mapping project delivers a data-driven approach to understanding and mitigating flood hazards in the region.

Project Scope: This initiative combines remote sensing data, Digital Elevation Models (DEMs), rainfall patterns, and historical flood records to create comprehensive risk maps. The analysis identifies high-risk zones, evaluates vulnerability of settlements and critical infrastructure, and models potential flood scenarios under different rainfall conditions.

Methodology:

• Integration of Sentinel and Landsat satellite imagery for land use classification
• Hydrological modeling using DEM data to map water flow patterns and accumulation zones
• Analysis of 10+ years of historical flood events and rainfall data
• Ground-truthing with community input and local knowledge
• Multi-criteria risk assessment incorporating elevation, proximity to water bodies, soil permeability, and population density

Key Deliverables:

• Interactive web-based flood risk maps accessible to government agencies and NGOs
• Identification of evacuation routes and safe zones
• Vulnerability assessment of schools, health facilities, and residential areas
• Seasonal flood forecasting models
• Actionable recommendations for land use planning and early warning systems

Impact:

This mapping tool empowers local authorities, humanitarian organizations, and community leaders to make informed decisions about disaster preparedness, resource allocation, and sustainable development in flood-prone areas.