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Abstract

 

This article in SSSAJ

  1. Vol. 42 No. 1, p. 170-172
     
    Received: May 9, 1977
    Accepted: Oct 3, 1977


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doi:10.2136/sssaj1978.03615995004200010038x

Rapid Estimate of Unsaturated Hydraulic Conductivity Function1

  1. E. Bresler,
  2. D. Russo and
  3. R. D. Miller2

Abstract

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 (he/h)2.6 or K(θ) = 0.27 m4 [(θ − θd)/(θw − θd)]7.2. Here m = dx/d (t1/2); x is distance to the wetting front and t is infiltration time; θd and θw are water contents of air-dry and “saturated” soil; h is pore water pressure head, and he is the air entry value of h. These relationships can serve as a general approximation of K(θ) and K(h) in nonsodic stable soils. Field measurements of he and saturated K can also be used to derive K(θ) and K(h).

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