The Enhanced Stream Water Quality Model (QUAL2E) is a comprehensive and versatile stream water quality model. It can simulate up to 15 water quality constituents in any combination desired by the user (Brown and Barnwell, 1987). The model is applicable to dendritic streams that are well mixed. It uses a finite difference solution of the advective-dispersive mass transport and reaction equations. The model is intended for use as a water quality planning tool.
Taken from the QUAL2E Windows Interface User's Guide from the Office of Water of the United States Environmental Protection Agency available for download at