Watershed Hydrologic and Water Quality Modeling

The HSPF Model (Hydrologic Simulation Program Fortran) is a U.S. EPA program for simulation of watershed hydrology and water quality for both conventional and toxic organic pollutants. The HSPF model uses information such as the time history of rainfall, temperature and solar radiation; land surface characteristics such as land use patterns; and land management practices to simulate the processes that occur in a watershed. The result of this simulation is a time history of the quantity and quality of runoff from an urban or agricultural watershed. Flow rate, sediment load, and nutrient and pesticide concentrations are predicted. HSPF includes an internal database management system to process the large amounts of simulation input and output. HSPF is used frequently for generating models for TMDL (Total Maximum Daily Load) studies.

This model is public domain and can be downloaded for FREE using the link below.

See also the Watershed Modeling System (WMS) software
WMS provides a high qaulity graphical user interface for HSPF.
WMS performs automated basin delineation from digital elevation data and determines basin parameters needed for HSPF in a GIS-friendly interface. 

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