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Field Measurement of Unsaturated Hydraulic Conductivity by Infiltration through Artificial Crusts¹

ABSTRACT

Field trials were made to test the applicability of a recently proposed method for measuring the unsaturated hydraulic conductivity (K) of crust-capped soil materials in a one-dimensional flow system, where the matric suction gradient is zero. K-values were determined from infiltration rates into crust-capped soil columns carved out in situ 30 cm in height. Matric suctions were measured with tensiometers. Examples are given for four Wisconsin soil horizons.

¹ Contribution from the Wis. Geol. & Natural History Surv., Univ. Ext., Univ. of Wisconsin, Madison in cooperation with the Wis. Agr. Exp. Sta. and the Corn Belt Branch, Soil & Water Conserv. Res. Div., ARS, USDA. Project funded in part by the Wisconsin Dept. of Natural Resources. Published with the permission of the Director of the Wis. Geol. & Natural History Surv. and the Director of the Agr. Exp. Sta.

² Visiting Assistant Professor, Visiting Professor of Soil Science, Professor of Soil Science, and Chairman of The Soil Survey Div., Wis., Geol. & Natural History Surv., Univ. Ext., and Research Hydraulic Engineer, USDA-ARS-SWC, respectively.

Received for publication November 9, 1970. Accepted for publication November 18, 1970.