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Western Cape Water Security Risk Assessment.
Reddrok Water Security Summary
This report assesses the potential drought risk in the Western Cape during the 2026/27 season due to El Niño and climate change. It includes risk factors, vulnerability analysis, impact scenarios, mitigation strategies and monitoring recommendations.
Context
ENSO forecasts indicate a high probability of El Niño conditions developing mid-to-late 2026, historically linked to reduced rainfall and higher temperatures in Southern Africa. Climate change trends show declining winter rainfall and increased evaporation rates in the Western Cape.
Key Risk Factors
- Meteorological: Reduced winter rainfall and higher temperatures.
- Hydrological: Dam level depletion and groundwater stress.
- Socio-economic: Agricultural vulnerability and urban demand growth.
Vulnerability Analysis
High-risk zones include West Coast, Cape Winelands and Karoo regions due to low adaptive capacity and reliance on rainfall. Infrastructure gaps exist in water source diversification outside metro areas.
Impact Scenarios
- Moderate El Niño: 10–20% rainfall deficit; dam levels drop by 15–25%; irrigation curtailment.
- Strong El Niño: >30% rainfall deficit; severe restrictions; potential 'Day Zero' scenario in rural towns.