Models & spreadsheets

Models and spreadsheets assist with scientific research and engineering. The models and spreadsheets we develop are available for use by the scientific community and the public. Download here.

Learn about models

Modeling the environment describes the models that we are developing and using. Models can predict environmental changes.

Let us help you calculate

Water quality


  • PermitCalc helps with many kinds of calculations needed by dischargers of effluents.

Contamination cleanup

Water supply