Editor’s choice
Editor’s choice
WEAP is SEI’s flagship water modelling software that assists water planners with its integrated features spanning policy, hydrology, climate scenarios, water quality and more.
Read our 2025 WEAP fact sheet for the basics on this innovative tool and how it can help water decision-makers and researchers.
Many regions face increasingly formidable freshwater management challenges, grappling with issues such as allocation of limited water resources, environmental quality and policies for sustainable water use. Conventional supply-oriented simulation models are not always adequate.
WEAP incorporates an integrated approach to water development into a practical tool for water resources planning, encompassing demand-side issues, water quality and ecosystem preservation and protection. It places water demand – water use patterns, equipment efficiencies, reuse, costs and allocation – on an equal footing with the supply side – streamflow, groundwater, reservoirs and water transfers. WEAP is a laboratory for examining alternative water development and management strategies.
Learn more in our latest WEAP fact sheet.
Tool / The Water Evaluation and Adaptation Planning tool (WEAP) provides a comprehensive and user-friendly framework for policy analysis in water resources planning.
Tool / WEAP proporciona un marco integral, flexible y fácil de usar para el análisis de políticas en la planeación de recursos hídricos.
SEI brief / SEI experts analyse how water efficiency and storage methods can help Rwanda meet its sustainable development and economic growth goals.
Feature / SEI Senior Scientist Chuck A. Young explains why California saw severe water shortages this year and how better forecasting can help alleviate those challenges.
Feature / SEI's flagship water modelling tool helped a San Jose-area water district identify an opportunity to help protected steelhead in the wake of dam construction.
