Suspended Sediment Transport from Nonpoint Sources

by Paul B. Makowski, Illinois State Water Survey, Champaign, IL, USA,

Document Type: Proceeding Paper

Part of: Hydraulics and Hydrology in the Small Computer Age


Precipitation, runoff, and suspended sediment concentration data were collected in a predominantly agricultural watershed in southwestern Illinois from January 1982 through October 1984. Overall, precipitation and runoff amounts were above normal, and autumn precipitation was much greater than normal. The expected spring precipitation was below normal. As a result of these patterns of precipitation, the measured annual suspended sediment load was about 50 percent of that obtained from a reservoir sedimentation survey. This was partially attributed to the fact that the highest suspended sediment transport per unit rainfall was found to occur in the spring when the ground surface was disturbed and a crop canopy was not developed.

Subject Headings: Suspended sediment | Sediment transport | Precipitation | Water pollution | Suspended loads | Runoff | Rain loads | Rainfall-runoff relationships | Illinois | United States

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