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
Videos (YouTube)

User Forum
Members List
Edit Profile

Additional Support
University Courses

About Us
SEI-US Water Resources Program
Please Contact Us

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!


Click here to download the tutorial (English) (PDF format, 29 MB)

Click here to download the tutorial (Chinese)* (PDF format, 11 MB)

Click here to download the tutorial (Spanish) (PDF format, 21 MB)

Click here to download the tutorial (French)* (PDF format, 7 MB)

Click here to download the tutorial (Farsi)* (PDF format, 6 MB)

Click here to download the tutorial (Vietnamese)* (PDF format, 6 MB)

Click here to download the WEAP-MABIA tutorial (English) (PDF format, 4 MB)   MABIA Tutorial Data (10 KB)

Click here to download the Gender and Social Equality tutorial (PDF format, 1 MB)

* Note: The Chinese, French, Farsi and Vietnamese versions are missing a few chapters not yet translated.

This tutorial will introduce you to WEAP, the Water Evaluation And Planning system, and how it can be applied to integrated water resources management. The exercises presented in this document are normally used as part of a WEAP training course, but can also be used for self study. They assume that you have some background in water resources issues and familiarity with Windows-based software, including spreadsheets (such as Microsoft Excel).

The training exercises are designed as a series of twelve independent modules, although the first three modules -- "WEAP in One Hour," "Basic Tools," and "Scenarios" -- are the foundation of the following nine modules, and should be completed first. If you only have a few hours and want to get a general impression of how WEAP works, then complete the first five modules. They will introduce you to WEAP and the basic elements of water demand and supply analysis.


WEAP in One Hour

      Creating a Study Area

      Setting General Parameters

      Entering Elements into the Schematic

      Getting First Results

Basic Tools

      Creating and Using Key Assumptions

      Using the Expression Builder


      Preparing the Ground for Scenarios

      Creating the Reference Scenario

      Creating and Running Scenarios

      Using the Water Year Method

Refining the Demand Analysis

      Disaggregating Demand

      Modeling Demand Side Management, Losses and Reuse

      Setting Demand Allocation Priorities

Refining the Supply

      Changing Supply Priorities

      Modeling Reservoirs

      Adding Flow Requirements

      Modeling Groundwater Resources

Data, Results and Formatting

      Exchanging Data

      Importing Time Series

      Working with Results


Reservoirs and Power Production

      Modeling Reservoirs

      Adding Hydropower Computation

      Modeling Run-of-River Power Plants

Water Quality

      Setting up Quality Modeling

      Entering Water Quality Data

      Using Water Quality Inflow Constraints for a Demand Site

      Entering Pollution Generating Activity for Demand Sites

      Modeling a Wastewater Treatment Plant

Linking WEAP to QUAL2K

      Linking to QUAL2K

      Running Scenarios


      Modeling Catchments: The Simplified Coefficient Method

      Understanding the Soil Moisture Method

      Modeling Catchments: The Soil Moisture Model

      Simulating Surface Water-Groundwater Interaction

Catchment Calibration

      Gather Observed Data and Select the Model Calibration Locations

      Complete Observed Data and Select the Model Calibration Period

      Visually Assess Model Calibration

      Adjust key parameters and conduct model sensitivity analysis

      Optimize calibration based on visual and statistical assessment

      Model Calibration Tips

Snow Hydrology and PEST Calibration

      Explore the Pre-Existing Model

      Enter Catchment Climate and Calibration Data

      Explore the Model Sensitivity

      Calibrate with PEST



      Modeling a Glacier

      Enter Catchment Climate

      Effect of Cooling Temperatures

      Effect of Warming Temperatures

      Parameter Sensitivity (Radiation Coefficient)

Financial Analysis

      Setting up the Cost and Revenue Model

      Modeling Cost

      Modeling Revenue


      Linking to MODFLOW

      Running MODFLOW and Viewing Results

      Scenario: Increased Population

      Scenario: Irrigation

      Scenario: Artificial Recharge

Linking WEAP to LEAP

      Linking WEAP to LEAP

      Scenario: Hydropower Generation from WEAP

      Scenario: Demand for Cooling Water from LEAP

      Scenario: Electricity Demand from WEAP