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Published in J Environ Qual 14:186-190 (1985)
© 1985 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Water Quality from Erosion Control Structures in Nebraska1

J. S. Schepers, D. D. Francis and L. N. Mielke2

ABSTRACT

Runoff collected from terrace and sediment-control basins having tile-outlet systems was compared with runoff water quality from Maple Creek in northeastern Nebraska. This study was part of a Model Implementation Project (MIP) initiated in 1978 to accelerate land treatment for erosion control and development of best management practices (BMPs). Soils in the area are very erosive (Nora-Crofton complex) when subjected to high-intensity rainfall in the spring and summer. Sediment concentrations in runoff from the terraces and sediment basins were initially high and comparable to stream concentrations until a pool of runoff water formed around the riser inlet of the tile discharge system. Formation of a pool allowed sediment to settle out away from the riser inlet, thus reducing sediment losses from the field. Sediment-borne N and P accounted for 85 to 98% of total N and P losses from the land. Because tile-outlet terraces and sediment basins effectively reduced sediment and nutrient concentrations in runoff, they proved to be an effective BMP for use by producers.

Key Words: agricultural watershed • tile-outlet terraces • sediment basins

NOTES

1 Contribution from Agric. Res. Service, USDA, in cooperation with the Nebraska Agric. Exp. Stn. Published as Paper 7591. Journal Series, Nebraska Agric. Exp. Stn. Portions of the work reported were supported by USEPA.

2 Soil scientist, USDA-ARS; research technologist, Dep. of Agron.; and soil scientist, USDA-ARS, respectively, Univ. of Nebraska, Lincoln, NE 68583.

Received for publication August 29, 1984.




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Copyright © 1985 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.