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Introducing the WASH Flows analytical tool
The Stockholm Environment Institute has developed WASH Flows, a Microsoft Excel-based tool that links household-level WASH data with watershed-scale modelling, such as WEAP. By bridging the gap between WASH services and Integrated Water Resource Management (IWRM), the tool allows users to estimate service levels, identify vulnerable communities, and model the impact of interventions on water balance and quality. A case study in the Tupiza watershed in Bolivia demonstrated the tool's ability to establish a service baseline—revealing significant gaps in safely managed water (25%) and sanitation (4%)—and to evaluate the effectiveness of proposed drinking water and decentralized sanitation systems in increasing drought resilience.
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Document type: Briefing