(1) SWMM user manual is downloaded from

https://www.epa.gov/sites/default/files/2019-02/documents/epaswmm5_1_manual_master_8-2-15.pdf

on January 31, 2022. This PDF document has 353 pages.

(2) SWAT user manual (I/O document) is downloaded from

https://swat.tamu.edu/media/69296/swat-io-documentation-2012.pdf

on January 31, 2022. This PDF document has 649 pages.

(3) MODFLOW user manual (I/O description) is downloaded from

https://water.usgs.gov/ogw/modflow/mf6io.pdf

on January 31, 2022. This PDF document has 188 pages.

(4)-(6) The three spreadsheet files document the manually identified I/O variables from each user manual mentioned above.