An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Environmental Modeling Community of Practice

Alterations to HSPF Data Input

Report briefly documents alterations that have been made to Hydrological Simulation Program - FORTRAN (HSPF) to enhance its use with PEST (model-independent parameter estimation)

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.