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Unsaturated Hydraulic Conductivity from Cumulative Inflow Data¹

ABSTRACT

A method of determining the wetting-phase unsaturated hydraulic conductivity K() from the data of cumulative inflow into a uniform soil core when water enters through a porous plate of high hydraulic resistance is described and evaluated. The method is based on piecewise application of the Green and Ampt (1911) approach to the above process of infiltration. The K() determined by this technique from the numerical-solution inflow data of Yolo light clay were within 20% of the K() values actually used in obtaining the numerical solution in two different cases of hydraulic resistance. Similar analysis of the experimental inflow data of Salkum silty clay loam for four different hydraulic resistances yielded the K() data which closely agreed with the K() values determined by detailed analysis of the soil-water content transients.

¹ Contribution from the Department of Agronomy and Soil Science, Univ. of Hawaii, Honolulu, 96822. Hawaii Agr. Exp. Sta. Journal Series no. 1710. Partial support was from funds provided by the US Forest Service under Cooperative Agreement no. 21–190.

² Assistant Soil Scientist.

Received for publication January 2, 1974. Accepted for publication May 28, 1974.