The SEI US Water Program works with policy-makers and stakeholders throughout California to model complex water systems and explore sustainable management options. Using the Water Evaluation and Planning (WEAP) tool, SEI helps local, regional and state-wide agencies create a shared “mental model” of watersheds that brings diverse interests and perspectives to the table.

Click on the image below to see an interactive presentation about SEI’s focus areas and work, and explore our projects, stories and publications through the menu on the left.


The Sacramento Water Allocation Model enables policy-makers to weigh difficult trade-offs in water use, by simulating a complex water system in the US.