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Published in Soil Sci Soc Am J 48:730-736 (1984)
© 1984 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of Simplified Methods for Determining Unsaturated Hydraulic Conductivity of Layered Soils1

W. M. Schuh, J. W. Bauder and S. C. Gupta2

ABSTRACT

The simplified field method of L.R. Ahuja et al. (1980) for determining hydraulic conductivity as a function of soil water suction, K(S), and the simplified field method of P.L. Libardi et al. (1980) for determining hydraulic conductivity as a function of soil water content, K({theta}), were compared with the instantaneous profile method, to evaluate their suitability for estimating hydraulic conductivity of layered soil. The Ahuja method worked well on coarse and fine-textured soils and complex soil profiles with stratification. The Libardi method worked well on coarse and fine-textured, homogeneous materials and homogeneous parent materials underlying stratified soil materials. A calculated matching value (Ko) was used with the Libardi method. Within layered soil materials slopes of the K({theta}) curves, calculated with the Libardi method, were adequate; however, calculated Ko values were often inadequate. Fit of calculated values with measured values of hydraulic conductivity could have been improved by using field-determined Ko values.

NOTES

1 Contribution from the Dep. of Soil Sci., Univ. of Minnesota, Minnesota Agric. Exp. Stn., and USDA.-Agric. Res. Serv., St. Paul, MN 55108. Released as Journal Article no. 13,284.

2 Formerly Research Assistant, Associate Professor, Dep. of Soil Science, Univ. of Minnesota, and Soil Scientist USDA-ARS, St. Paul, MN 55108. Senior author is currently Senior Agronomist, CENTROL, Greenville, WI 54942. J.W. Bauder is currently Associate Professor/Extension Soil Scientist at Montana State Univ., Bozeman, MT 59717.

Received for publication April 6, 1983. Accepted for publication January 11, 1984.






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