WEAP In Action
Explore real-world projects powered by WEAP
Balancing Water Use in California's Central Valley
SEI worked with the California State Water Resources Control Board and Stantec to develop SacWAM, a WEAP model that represents the Sacramento River Basin and Sacramento-San Joaquin Delta. SacWAM is helping decision-makers assess potential regulatory revisions, weighing trade-offs between protecting ecosystems, securing urban supplies, and sustaining agriculture.
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Advancing Integrated Watershed Planning in Chile
In 2019, Chile's General Water Directorate (DGA) launched a national effort to prepare Strategic Water Plans (PEGHs) in all river basins, requiring integrated modeling of both surface and groundwater to address drought and other climate extremes. As of 2022, 39 PEGHs are informed with WEAP models, 29 of which are linked with MODFLOW in a unified modeling framework, including the five pilot basins—Copiapó, Limarí, Choapa, Petorca, and Ligua—from the initial study.
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Building Urban Water Resilience in Quito
Through the DAR AGUA Quito project, SEI supported the EPMAPS water utility in strengthening its Master Water Plan under future uncertainty. A daily WEAP model simulated hydrology, seismic hazards (volcanic eruptions and earthquakes), and climate impacts. Adaptation management options, such as reducing water losses, expanding infrastructure, and conserving páramo wetlands, were visualized in a Tableau dashboard, enabling decision-makers to test strategies for a resilient water supply.
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Linking Water and Energy in Central Asia
Since 2020, SEI has partnered with USAID and the World Bank to connect water, energy, and economic planning in Central Asia. By integrating WEAP with the LEAP energy model and AMES economic model, governments are able to explore co-benefits and trade-offs of mitigation and adaptation actions. Early findings revealed that billions of dollars in investments could be misallocated without this cross-sector perspective, including missing out on an additional 20% of storage in dry years.
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Reconciling Aquatic Habitat and Supply in California's Santa Clara Valley
SEI applied WEAP and the Aquatic Habitat Assessment (AHA) plugin to quantify tradeoffs of salmon and steelhead habitat alongside water supply reliability. The results were used by a range of conflicting parties to design and build consensus around the set of reservoir reoperations, which were certified under the final environmental impact report in 2023. The AHA plugin quantifies the surface area and suitability of habitat for the different life stages based on river conditions.
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Measuring Water Stress with WEAP (SDG 6.4.2)
A new WEAP plugin developed with the UN Food and Agriculture Organization (FAO) calculates water stress at the catchment scale, supporting monitoring of Sustainable Development Goal (SDG) Indicator 6.4.2. This tool provides countries with detailed insights on water scarcity, helping them evaluate risks, prioritize adaptation actions, and track progress toward securing clean water and sanitation for all under a changing climate.
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