Caption title. At head of title: Project summary. "Sept. 1982." "EPA/600-S2-81-090."

"Environmental protection efforts dealing with agricultural and nonpoint sources have been increased since passage of Clean Water Act of 1977 and the subsequent implementation of the Rural Clean Water Program. As part of the research on the occurrence movement, transformations, fate, impact, and control of environmental contaminants, data and analytical methodologies are developed to assess the causes and possible solutions of adverse environmental effects of the irrigated agriculture. Efforts to achieve water quality goals include the identification and application of best management practices (BMPs) to control agriculturally relater water pollutants. This report addresses the physical factors contributing to sediment and nutrient losses from irrigated croplands, and the economic techniques &/or factors for assessing the costs of selected pollution abatement practices. The methodology and techniques described will be useful in reaching technically sound and economically feasible environmental management decisions. This report should especially benefit environmental managers as they attempt to identify and implement pollution control strategies relevant to western irrigated agriculture."