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Water and Ecosystems

The water program drives innovation in water management by developing, using, and transferring planning tools and participatory process that promote holistic, transparent and robust decision-making.

We work on national, regional and local scales, mapping out watersheds and future conditions using SEI’s Water Evaluation And Planning System (WEAP). WEAP enables policy-makers and stakeholders to consider how management plans will affect cities, industries and farms, as well as long-neglected interests such as wildlife habitat and vulnerable communities.

Our researchers are located in both Davis, California and Somerville, Massachusetts.


The Water Evaluation and Planning tool (WEAP) provides a comprehensive, flexible and user-friendly framework for policy analysis in water resources planning.

Recent publications