Water Quality Models for Watershed Management

Several water quality models are available for use in assessing the effects of agricultural management on the environment. Since these models are being used to solve a variety of water quality problems, they vary considerably in structure and complexity. For example, simple screening models may be adequate and appropriate for identifying potential pollutant sources. However, more comprehensive models are needed in comparing agricultural management effects on chemical transport by runoff and sediment. Model requirements may also vary depending upon temporal and spatial scales, cost, and risk associated with proposed projects.