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Simple Method for Predicting Drainage from Field Plots¹

ABSTRACT

When the one-dimensional moisture flow equation is simplified by applying the unit gradient approximation, a first-order partial differential equation results. The first-order equation is hyperbolic and easily solved by the method of P. D. Lax. Three published K() relationships were used to generate three analytical solutions for the drainage phase following infiltration. All three solutions produced straight lines or nearly straight lines when log of total water above a depth was plotted versus log of time. Several suggestions for obtaining the required parameters are presented and two example problems are included to demonstrate the accuracy and applicability of the method.

¹ Contribution from Rockwell International, Rockwell Hanford Operations, Richland, Wash. Document RHO-SA-138. Part of a thesis submitted by senior author in partial fulfillment of the M.S. Degree at Montana State University.

² Senior Soil Physicist, Rockwell International, P.O. Box 800, Richland, WA 99352; Professor, Agronomy Department, Montana State Univ.; and Soil Physicist, U.S. Salinity Lab., Riverside, Calif., respectively.

Received for publication November 13, 1979. Accepted for publication August 6, 1980.

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