ABSTRACT
The Hydrologic Simulation Program-Fortran (HSPF) is a watershed-scale, semidistributed model developed from the original Stanford model (Bicknell et al. 2001). It is one of the two dynamic models intended for modeling watersheds dominated by nonpoint sources in the U.S. Environmental Protection Agency (EPA) Better Assessment Science Integrating Point and Nonpoint Sources (BASINS) package (U.S. Environmental Protection Agency 2004a). The other model is the Soil Water Assessment Tool (SWAT) described by Arnold et al. (1998) and Neitsch et al. (2002). The functions and processes included in HSPF were derived primarily from the following group of predecessor models:
Hydrocomp Simulation Programming (HSP) (Hydrocomp, Inc. 1976, 1977) Nonpoint Source (NPS) Model (Donigian and Crawford 1976a) Agricultural Runoff Management (ARM) Model (Donigian and Crawford,
1976b; Donigian et al. 1977) Sediment and Radionuclides Transport (SERATRA) (Onishi and Wise 1979)
The original development of HSPF was sponsored by the EPA Environmental Research Laboratory in Athens, Georgia, during the 1970s. HSP was a descendant of the Stanford Watershed model (Crawford and Linsley 1966). It was first released in 1980 as Release 5. Later development was sponsored by the U.S. Geological Survey (USGS) Water Resources Division in Reston, Virginia.
