The Hydrological Simulation Program - FORTRAN (HSPF) was developed by and is maintained by the U.S. Environmental Protection Agency. The HSPF models used in this study were built by the authors. The forcing (meteorological) data are from the U.S. Army Corps of Engineers, the National Oceanic and Atmospheric Administration, and the Illinois State Water Survey; the discharge data are from the U.S. Geological Survey's National Water Information System Database. The PEST software used for HSPF optimization was developed by John Doherty of Watermark Numerical Computing. The R scripts used for discharge uncertainty analysis were adapted from those provided with the paper by Mansanarez and others (2019, https://doi.org/10.1029/2018WR023389), who also provided the Markov chain Monte Carlo estimation engine used therein.
