Sedimentation - Soil erosion can cause buildup of sediments behind dams, and in streams, storm sewers, ditches, and roads. Sediment can reduce water clarity.
Incremental soil loss will eventually affect the landholder in the form of reduced yield potential and/or increased input costs.
Eutrophication - Excess nitrogen and phosphorus leached or washed from soil into surface water may enhance the growth of algae and plants and reduce the amount of oxygen available to fish.
National opinion surveys reflect the public's concern that sediment from agricultural land, pesticides, and fertilizers from animal wastes and chemical applications may be contributing to surface and ground water pollution. This publication documents the national and regional status of and trends in water quality from the early 1980s to the early 1990s relative to these agricultural substances. It sets the stage for subsequent analysis of projected resource conditions under alternative social, economic, and environmental policies.