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Rapid Estimate of Unsaturated Hydraulic Conductivity Function¹

ABSTRACT

From results of Reichardt, Nielsen, and Biggar and of Russo and Bresler, it is inferred that a laboratory horizontal infiltration experiment with air-dry soil yields an estimate of the saturated-unsaturated hydraulic conductivity function given by K(h) = 0.27 m⁴ (h_e/h)^2.6 or K() = 0.27 m⁴ [( – _d)/(_w – _d)]^7.2. Here m = dx/d (t^1/2); x is distance to the wetting front and t is infiltration time; _d and _w are water contents of air-dry and "saturated" soil; h is pore water pressure head, and h_e is the air entry value of h. These relationships can serve as a general approximation of K() and K(h) in nonsodic stable soils. Field measurements of h_e and saturated K can also be used to derive K() and K(h).

¹ Contribution from the Agric. Res. Organization, The Volcani Center, Bet Dagan, Israel. 1977 Series No. 137-E. This research was supported by a grant from the United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel.

² Soil Physicist and Graduate Research Assistant, Div. of Soil Physics, ARO, The Volcani Center; and Professor of Soil Physics, Cornell Univ., Ithaca, N.Y.

Received for publication May 9, 1977. Accepted for publication October 3, 1977.

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