SWAT Model Calibtration and Uncertainty Using SWAT-CUP.

Soil and Water Assessment Tool (SWAT) is a is a physically based, continuous time, watershed model that is increasingly being used to support decisions related to alternative management strategies in the areas of landuse change, climate change, water allocation, non-point source pollution, TMDLs etc. Calibration and uncertainty analysis is an important step in testing the SWAT model predictive capabilities. Many procedures have become available in recent years to perform calibration and uncertainty analysis. Since one procedure cannot be applied to all situations and different projects can benefit from different procedures, five different procedures (GLUE, ParaSol, SUFI2, MCMC, and PSO) are linked to SWAT model under a one user interface called SWAT-CUP (SWAT Calibration Uncertainty Procedures).  SWAT-CUP is a public domain program which can be used freely and enables not only calibration and uncertainty analysis but also sensitivity analysis and validation of SWAT model. The presentation will provide insights into different procedures and will briefly discuss SUFI-2 procedure. A quick demo of various options in SWAT-CUP interface will be presented along with an application example using SUFI-2.