Ahero Irrigation Scheme — Flood Extent Monitoring

The problem

Recurring floods across the Ahero irrigation scheme damage rice crops and disrupt productivity. The scheme needed a clear, evidence-based picture of where and when flooding occurs so that hazard planning and resource allocation could be targeted.

Approach

• Built a Google Earth Engine workflow to classify flood extent across multiple seasons, comparing rainfall-driven events from 2016 to 2022.
• Extracted and cleaned flood masks, then exported them for cartographic layout in QGIS/ArcGIS Pro.
• Produced a comparable multi-panel product so changes between years can be read at a glance.

Result

Flood risk mapping for 2,500+ hectares of rice fields, supporting proactive hazard planning and helping protect yield through better-timed interventions.