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Field Vs. Laboratory Determined Hydraulic Conductivities of Some Slowly Permeable Horizons¹

ABSTRACT

Saturated hydraulic conductivities K_(µm/s) of soils of spodic and argillic horizons were measured in several Florida soils. The soils were Haplaquods, Haplohumods, Glossaqualfs, and Argiaquolls. Two methods of measurement were compared. The core method consistently gave larger hydraulic conductivity values than the piezometer method. The lowest K_(µm/s) rates were in argillic horizons. The permeability classification of most soils studied depended upon the measurement method used.

¹ Contribution from the USDA-SCS, P.O. Box 1208, Gainesville, Fla.

² Soil Survey Party Leader, SCS, DeFuniak Springs, Fla.; Soil Scientist, SCS, Kaduna, Nigeria; and Soil Scientist, SCS, Beltsville, Md., respectively.

Received for publication December 19, 1980. Accepted for publication January 14, 1981.