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Hydraulic Conductivity of Soil as Determined from Cumulative Runoff¹

ABSTRACT

Hydraulic conductivity measurements using a Purdue sprinkling infiltrometer were performed on plots with the resultant data of cumulative runoff vs. time analyzed to determine values of hydraulic conductivity through the use of a cumulative runoff equation based on an infiltration equation proposed by Swartzendruber. Comparisons made with a differentiated form of an infiltration equation by Swartzendruber and Youngs (similar to the form of Philip's) or Swartzendruber's proposed infiltration equation were not, generally, greatly different. Additions of random errors in the data through computer simulation also did not change the resultant hydraulic conductivity values in the cumulative runoff method very much from the original data's determined hydraulic conductivity values. Thus using cumulative runoff versus time to determine hydraulic conductivity has shown to be reliable.

¹ This research was supported by funds from the U.S. Department of Interior, Office of Water Research and Technology, and in cooperation with Purdue Agric. Exp. Stn., Purdue Journal Paper no. 8812.

² Research Associate, Land Reclamation Research Center, North Dakota State University, Mandan (formerly Graduate Student, West Lafayette, Ind.); Hydraulic Engineer, USDA, and Associate Professor of Agric. Engineering; Soil Scientist, USDA, and Professor of Agronomy; and Professor of Agronomy; respectively, Purdue University, West Lafayette, Ind.

Received for publication April 27, 1982. Accepted for publication August 10, 1982.