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 28 Nov 2022

June 2023 - Aarhus, Denmark

Save the date! The next International SWAT Conference and Workshops will be held 26-30 June 2023 in Aarhus, Denmark. Call for abstracts open now.

Short Survey Request

Researchers at The University of Iowa are investigating natural infrastructure practices to reduce flood and waterborne nitrogen risks and are seeking expert opinions regarding their effectiveness. Please consider completing the following short survey, which should take no more than five to ten minutes. The survey consists of three main sections where you will be asked to qualitatively evaluate the relative effectiveness of eight common natural infrastructure practices. Your input is greatly appreciated!

Complete the Survey

Call for Papers: Journal of Hydrology Special Issue

Development of Watershed Hydrological/Water Environmental Models and Application of Advanced Technology. The following papers are solicited (including but not limited to):

  • Model Development: 1) Development and improvement of models based on the mechanism of processes; 2) Development and extended application of typical models and efficient large-scale models; 3) New algorithms and applications of data mining and machine learning in watershed models; 4) Risk assessment and management models/ methods for hydrological/ water environmental systems;
  • Model Application: 1) Application of remote sensing technology, multisource data, and assimilation technology in model construction; 2) Integration of hydrological models and water environmental models; 3) Coupling basin models and lake/reservoir models; 4) Integrated methods of environmental, economic, agricultural, and other fields; 5) Regulation and decision-making models/ methods adapted to the watershed hydrological/water environmental problems.

Get more information on Science Direct

Upcoming Workshops

Honors & Awards

Dr. Srinivasan University Distinguished Professor – April 2022

Software & Data Tools


SWAT+ rev. 60.5.4, QSWAT+ 2.3, SWAT+ Editor 2.1

28 Nov 2022

QGIS3 Interface to SWAT / Version 1.6

28 Nov 2022
SWAT2012 Model

Executables and source code / rev. 685

6 Sep 2022

ArcGIS Interface to SWAT / Version 2012.10.25

3 Jan 2023

Version 3

9 Jul 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.