This practical handbook provides up-to-date coverage on how to apply computer hardware and software for water quality monitoring as well as specific modelling approaches that allow users to obtain National Pollutant Discharge Elimination System (NPDES) permits. This title also includes case studies of leading EPA-recommended modelling software, including QUAL2 and WASP. It instructs engineers on how to use water quality modelling software to conform to tighter regulatory standards and covers the practical applications of wasteload allocation, a technique basic to maintaining water quality.