Exposure Assessment Models


Hydrological Simulation Program - FORTRAN (HSPF) is a comprehensive package for simulation of watershed hydrology and water quality for both conventional and toxic organic pollutants. HSPF incorporates watershed-scale ARM and NPS models into a basin-scale analysis framework that includes fate and transport in one dimensional stream channels. It is the only comprehensive model of watershed hydrology and water quality that allows the integrated simulation of land and soil contaminant runoff processes with In-stream hydraulic and sediment-chemical interactions. The result of this simulation is a time history of the runoff flow rate, sediment load, and nutrient and pesticide concentrations, along with a time history of water quantity and quality at any point in a watershed. HSPF simulates three sediment types (sand, silt, and clay) in addition to a single organic chemical and transformation products of that chemical.

Current Version: 12.4 (Pre-Release)
Release Date: April 2014
Development Status: Pre-Release
Development Information: A revised release notes will be included with the final HSPF 12.4 release.
Operating System: Windows XP, Vista, Windows 7, or Windows 8
Development Language: FORTRAN
Intended Audience: Water Resources Management Institutions, Water Quantity and Quality modelers, Regulatory Communities in Support of the Clean Water Act
Key Words: assessment, biology, compliance, deposition, discharge, environmental effects, estuaries, hydrology, lakes, metals, monitoring, NPS related, NPDES, nutrients, permits, pesticides, point source(s), rivers, sediment, streams, surface water, test/analysis, TMDL related, toxicity
Related Web Sites: EPA's environmental analysis system BASINS
Text Files (ASCII Format)
File Name File Description
ABSTRACT.TXT Summary of functions, theory, and applicability.
Download Files
File Type /
File Name /
Format /
File Description
Install /
 HSPF Install File 12.4(1 pg, 14 MB)/
Self-extracting Executable /
13 MB
Setup file for version 12.4 of the HSPF system. Use this for new installs. Setup file includes documentation.