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Field Measurement of Unsaturated Hydraulic Conductivity by Infiltration Through Gypsum Crusts¹

ABSTRACT

Field trials were made to test the use of gypsum crusts in the crust test method for measuring unsaturated hydraulic conductivity (K) in situ. Crusts consisting of mixtures of sand and gypsum were more stable and had more constant hydraulic properties than previously used crusts consisting of various puddled soil materials. Test results of four soil horizons are reported.

¹ Contribution from the Wis. Geol. & Nat. Hist. Surv., Univ. Ext., Univ. of Wis., Madison in cooperation with the Soil Sci. Dep., Univ. of Wis. Project funded in part by the Wis. Dep. of Nat. Resour. Published with the permission of the Director of the Wis. Geol. & Nat. Hist. Surv. and the Director of the Agr. Exp. Sta.

² Assistant Professor of Soil Science and Project Assistant, respectively.

Received for publication March 1, 1972. Accepted for publication May 16, 1972.