Nonpoint source pollution has been increasingly recognized as a major cause of reduction in water quality. Nationally, agricultural runoff accounts for approximately 46% of sediment, 47% of total phosphorus, and 52% of total nitrogen discharged into waterways; in Iowa, these percentages are much higher. Sediment is the greatest overall polluter nationwide, affecting nearly all components of aquatic ecosystems.
Kurt W. Pontasch
Year of Grant Completion
Pontasch, Kurt W., "Prediction and field validation of sediment impacts on riffle insect communities" (1994). Leopold Center Completed Grant Reports. 42.