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Simple Field Method for Determining Unsaturated Hydraulic Conductivity

Daniel B. Stephens & Assoc., 4415 Hawkins NE, Albuquerque, NM 87109

Mushtaque Ahmed

Bangladesh Univ. of Engineering and Technology, Dhaka-1000, Bangladesh

Thomas C. Kaspar

National Soil Tilth Lab., Ames, IA 50011

Robert Horton

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

*Corresponding author.

ABSTRACT

A new method is proposed for determining in situ unsaturated hydraulic conductivities from unsaturated infiltration measurements made at several tensions on the same infiltration surface. Wooding's equation for steady-state unconfined infiltration rates is used in calculating hydraulic conductivities. Hydraulic conductivities calculated with the new method are consistent with unit gradient laboratory measurements of saturated and unsaturated hydraulic conductivity. This simple field method is potentially valuable because it is faster than unit gradient laboratory methods, and it is less disruptive of pore continuity than other field infiltration techniques.

Joint contribution from USDA-ARS and Iowa State Univ. Journal Paper no. J-13716 of the Iowa Agric. and Home Economics Exp. Stn. Projects no. 2659 and 2715.

Received for publication November 6, 1989.

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