MODELING

Modeling utilizes computer programs, which consist of various mathematical equations that simulate a real-world watershed.  Inputs to the computer model include actual measured climate data, such as precipitation and temperature.  Streamflow and pollutant transport are the outputs of the model; this data is used to determine Total Daily Maximum Loads (TMDLs) in order to protect water quality.

Several of the commonly used modeling programs are listed below.

Hydrologic Simulation Program – FORTRAN (HSPF)
Generalized Watershed Loading Function (GWLF)
Two-Dimensional, Laterally Averaged, Hydrodynamic and Water Quality Model (CE-QUAL-W2)
Water Quality Analysis Simulation Program (WASP)