Abstract
Describes a review of the concepts and theory in a number of alternative numerical models for the simulation of the quantity and quality of runoff from catchments. Models considered were AQUALM-SP, AUSQUAL, CMSS, HSPF, STORM, and WQRRS. The models were compared on the basis of the conceptual components necessary for the development of an effective numerical model rather than their ability accurately to predict the quantity and quality of surface runoff from the gauged catchment.