Author(s): Aregai Tecle, Daniel G Neary, Peter Ffolliott, Malchus B Baker Jr
Water-quality degradation is often constant because information about on- and off-site watershed disturbances and how to reduce their impact is limited. This paper identifies different types of water-quality parameters, their causes and possible sources, and the mandatory or recommended standards for drinking water and aquatic wildlife habitats. Information presented should help develop methods that estimate or forecast the production and movement of diffuse pollutants, determine how to minimize the production of pollutants, and prevent entry of pollutants into streams and other surface water bodies. The paper reviews key models, and various water-quality management activities. The activities can be used independently or together to maintain and restore the quality of degraded surface water at the watershed scale.