ReWaterGAP documentation

Date: Jan 01, 2026 Version: Development Version

Useful links: Source Repository | Issues & Ideas |

ReWaterGAP is an open source, GNU-GPL 3-licensed hydrological simulation software for quantifying water flows and storages on all continents of the Earth.

Getting started

New to ReWaterGAP? Check out the getting started guides. They contain an introduction to ReWaterGAP’s main concepts and links to additional tutorials.

Getting started

User guide

The user guide provides in-depth information on the key concepts of ReWaterGAP with useful background information and explanation.

User Guide

Model Processes

This section contains a detailed description of the ReWaterGAP Model. The reference describes how the methods work and which parameters can be used.

Model Processes

Contributers Guide

Saw a typo in the documentation or want to improve functionalities? The contributing guidelines will guide you through the process of improving ReWaterGAP.

Contributers Guide

Glossary

Glossary