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Factors Influencing the Crust Test for in situ Measurement of Hydraulic Conductivity¹

ABSTRACT

Field trials using the crust test were used to determine the influence of five parameters on the saturated and unsaturated hydraulic conductivity values measured on two soils of different structure. These factors were (i) the diameter, (ii) the height of the soil pedestal used in the test, (iii) the degree of soil wetness at which k was measured, (iv) soil structure, and (v) operator effects. Diameter and height were found to strongly affect measurement when they had low values. These two design factors were dependent on the wetness and structure of the soil. Operator differences were small.

¹ Contribution from the Small Scale Waste Management Project, Univ. of Wisconsin, Madison. College of Agri. and Life Sciences, and College of Engineering. Funded by the State of Wisconsin and the EPA. Grant no. R802874).

² Specialist, Soil Sci. Dep., College of Agricultural and Life Sciences, Univ. of Wisconsin, Madison, WI 53706.

Received for publication December 27, 1976. Accepted for publication June 13, 1977.