The Soil & Water Assessment Tool is a small watershed to river basin-scale model used to simulate the quality and quantity of surface and ground water and predict the environmental impact of land use, land management practices, and climate change. SWAT is widely used in assessing soil erosion prevention and control, non-point source pollution control and regional management in watersheds.


Introducing SWAT+, a completely revised version of the SWAT model. SWAT+ provides a more flexible spatial representation of interactions and processes within a watershed.

Download SWAT+
Updated 4 Dec 2019

Call for Papers

The following SWAT special issue journals are accepting submissions. You do not need to have presented at a SWAT conference in order to submit a paper.

Upcoming Workshops

2020 AGU Fall Meeting

The 2020 AGU Fall Meeting in San Francisco, CA will take place 7-11 December. We would like to bring the following session to your attention: 

H016 - Advances in Watershed Modeling: Hydrologic & Nutrient Processes, Conservation Management, Food Production, Energy Consumption and Model Coupling
Haw Yen (Texas A&M University), Jeffrey G Arnold (USDA-ARS), Wei Ouyang (Beijing Normal University), and Yongping Yuan (USEPA)

Software & Data Tools


QGIS3 Interface to SWAT / Version 1.1

5 Oct 2020
SWAT2012 Model

Executables and source code / rev. 681

8 June 2020

ArcGIS Interface to SWAT / Version 2012.10.24

19 August 2020

Version 3

9 Jul 2019

SWAT+ rev. 59.3, QSWAT+ 1.2.2, SWAT+ Editor 1.2.3

4 Dec 2019
Global Weather Data for SWAT

Climate Forecast System Reanalysis (CFSR) data from 1979-2014


Calibration/uncertainty or sensitivity

WGN Parameters Estimation Tool

Using Microsoft Access / Version 0.18.03

17 Apr 2018
WET - Water Ecosystems Tool

Advanced lake and reservoir modeling coupled to SWAT

Job Opportunities

Looking for job opportunities related to SWAT and/or watershed modeling? Check out our listing.

Reviewers Needed

We are looking for help reviewing SWAT peer-reviewed journal papers from the community. Sign up as a volunteer.