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Comparisons of Calculated and Measured Capillary Potentials from Line Sources¹

ABSTRACT

This paper is a sequel to D. W. Zachmann and A. W. Thomas' (1973) development of equations describing steady infiltration from line sources. Calculated distributions of capillary potentials are compared with those measured in a soil bin designed to model the water distribution from a subsurface irrigation system. Limitations of the steady-state equations for predicting capillary potentials are given. A procedure for selecting lateral depth and spacing to attain a given matric flux potentials is also given.

¹ Contribution from Southern Piedmont Conservation Research Center, Watkinsville, GA 30677, Athens, Georgia Area, Southern Region, Agricultural Research Service, USDA, and Colorado-Wyoming Area Offices, in cooperation with the Colorado State University Experiment Station.

² Agricultural Engineer, USDA, Watkinsville, GA 30677; Agricultural Engineer, USDA, Fort Collins, CO 80521; Assistant Professor, Department of Mathematics, Colorado State Univ., Fort Collins, Colo.: and Agricultural Engineer, USDA, Fort Collins, Colo., respectively.

Received for publication April 28, 1975. Accepted for publication October 2, 1975.