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