Welcome to WEAP's Website WEAP
WEAP is an initiative of the Stockholm Environment Institute.

About WEAP

What's New?
Sample Screens
History and Credits

Using WEAP
User Guide

User Forum
Members List
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Additional Support
University Courses

About Us
SEI-US Water Resources Program
Please Contact Us

Environmental News
Interested in Energy?
Read about LEAP: SEI's software for energy planning.

Link WEAP and LEAP for combined Water-Energy planning.
Watch a video demo!

WEAP Survey: If you recently received an email about a
"WEAP Software Survey" from Angela Lavado Alvarado (surveys@surveys.oregonstate.edu), please take the time to complete the survey. It will greatly help us understand your needs and help us plan the future direction for WEAP development and training.

Welcome to WEAP!

WEAP ("Water Evaluation And Planning" system) is a user-friendly software tool that takes an integrated approach to water resources planning.

Freshwater management challenges are increasingly common. Allocation of limited water resources between agricultural, municipal and environmental uses now requires the full integration of supply, demand, water quality and ecological considerations. The Water Evaluation and Planning system, or WEAP, aims to incorporate these issues into a practical yet robust tool for integrated water resources planning. WEAP is developed by the Stockholm Environment Institute's U.S. Center.

WEAP Highlights

Integrated Approach Unique approach for conducting integrated water resources planning assessments
Stakeholder Process Transparent structure facilitates engagement of diverse stakeholders in an open process
Water Balance A database maintains water demand and supply information to drive mass balance model on a link-node architecture
Simulation Based Calculates water demand, supply, runoff, infiltration, crop requirements, flows, and storage, and pollution generation, treatment, discharge and instream water quality under varying hydrologic and policy scenarios
Policy Scenarios Evaluates a full range of water development and management options, and takes account of multiple and competing uses of water systems
User-friendly Interface Graphical drag-and-drop GIS-based interface with flexible model output as maps, charts and tables
Model Integration Dynamic links to other models and software, such as QUAL2K, MODFLOW, MODPATH, PEST, Excel and GAMS

WEAP Schematic