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Published in Soil Sci Soc Am J 36:827-830 (1972)
© 1972 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Prediction of Runoff and Erosion from Natural Rainfall Using a Rainfall Simulator1

R. A. Young and R. E. Burwell2

ABSTRACT

Field rainfall simulators have been used extensively for runoff and erosion studies. To more accurately interpret and apply the results of studies using simulated rainfall, it is necessary to know the relative effects of natural vs. simulated rainfall.

A comparison was made of the soil and water losses from three natural storms and three simulated storms on cultivated fallow plots under similar rainfall and soil conditions. A rainulator was used to apply the simulated storms. Soil losses from the three simulated storms averaged 77% of those from the natural rainstorms. This compares closely, considering that the average EI value for the simulated storms was 78% of that for natural rainstorms. The runoff from the simulated storms compared quite closely to runoff from the natural storms.

The study showed that, in general, the rainulator can be used to simulate rainfall for runoff and erosion research with confidence that the results will reflect the runoff and soil loss that would occur under similar conditions of natural rainfall.

NOTES

1 Contribution from the North Central Soil Conservation Res. Center, Corn Belt Branch, Soil and Water Conservation Res. Div., ARS, USDA, Morris, Minn., in cooperation with the Minnesota Agr. Exp. Sta. Sci. Journal Series no. 7866.

2 Agricultural Engineer, USDA; and Research Soil Scientist, USDA, (formerly Morris, Minn., now at Council Bluffs, Iowa), respectively.

Received for publication March 1, 1972. Accepted for publication May 12, 1972.






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