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This article in SSSAJ

  1. Vol. 39 No. 3, p. 418-423
    Received: Sept 3, 1974
    Accepted: Jan 20, 1975

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A One-Step Wetting Procedure for Determining Both Water Characteristic and Hydraulic Conductivity of a Soil Core1

  1. L. R. Ahuja2



Reasonable simplifications are used to obtain both the suction-water content and unsaturated hydraulic conductivity relationships from data measured during wetting of a relatively dry soil core through a high-hydraulic-resistance porous plate. For soil-water contents below the bubbling-pressure value, the two functions are assumed to be of previously known power forms. The resulting similarity is then utilized to obtain these functions from cumulative inflow and wetting-front position data, using an iterative numerical solution of the ordinary differential equations. Accuracy of the solution is tested on a set of generated data. Tests of the technique as a whole on generated data for one soil and experimental data for another show it to be promising. For water contents above the bubbling-pressure value, a method is suggested to obtain the two hydrologic properties from cumulative inflow and soil-water suction at the other end of the core.

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