Compare SWAT Versions in SWAT Viewer

A great thing about SWAT is that it’s open source. The algorithms could be modified to best fit the study areas. For a modified version, it’s important to demonstrate the effectiveness by comparing with the base version. The SWAT Viewer gives you all the tools to compare any two version in different angles. In this video, I will talk about the comparison functions in SWAT Viewer. Hope you found it’s helpful for your research.

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Model Structure of SWAT Project

SWAT projects created by ArcSWAT and QSWAT shares the same structure. In this video, I talked about the structure and how the SWAT Viewer use the information to run the model and show the model result on a map. If you are not using ArcSWAT or QSWAT to create your model, you still could use the SWAT Viewer as long as you have the model input files saved in (scenarios -> scenario name-> txtinout) folder and the reach and subbasin shapefiles saved in (watershed -> shapes) folder.

Model Structure of SWAT Project

SWAT Output Viewer – Export Annual Result to CSV File

Some research focus on the nutrient load at the outlet. An annual load table would be helpful. With SWAT Output Viewer, the table could be exported to a CSV file.

The Export button is located in the toolbar besides the help button.

Export Annual Button

To export the annual TP load, select the most downstream reach in the reach view and select TOT_Pkg in the variable list.

ExportAnnualSelection

Click the Export Annual button and select the destination folder, the annual data will be exported to a csv file. An example file is shown below.

Export Annual Result

SWAT Output Viewer – Switch Time for Thematic Map

The thematic map in SWAT Output Viewer is able to show data of three summary types: single time step, annual and average annual. For single time step, it could be each day, each month and each year depending out the configuration of the outputs.

Thematic Map Summary

When the single time step option is selected, the time could be switched by double-clicking on the data record in chart table as shown below where monthly result is used. The time is also shown in the in the status bar on the bottom left corner. Note that, this only affect the thematic map. The chart would be affected.

Switch Time