Estimation of Hydraulic Conductivity from Effective Porosity Data for Some Indiana Soils
Hydraulic-conductivity data are needed to predict how soils will respond to various uses. Saturated hydraulic conductivity (Ks), however, has been determined for only a few soils. Ahuja et al. proposed a model by which Ks can be estimated from effective porosity (φ3), the difference between total porosity and the volumetric soil water content at 33 kPa of suction. If this relationship were known, Ks could be predicted for many more soils using available water-retention information. Previously, Ks had been determined in saturated soil horizons by the piezometer method for a set of soils in Indiana. These data were summarized by soil classes, called lithomorphic classes, based on origin of parent material, kind of soil horizon, and soil texture. More recently, bulk-density and water-retention measurements were summarized using similar classes. In this study, Ks is related to φe for some Alfisols and Mollisols of Indiana. The relationship is Ks = 5.01 × 10−3 × φ3.21e, where Ks is in m/s and φe is in m3/m3. This compares favorably with the relationships found by Ahuja et al.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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