You could be reading the full-text of this article now if you...

If you have access to this article through your institution,
you can view this article in

CALCULATION OF HYDRAULIC CONDUCTIVITY FROM SUCTION PERMEAMETER MEASUREMENTS.

COOK, F. J.
Soil Science:
Article: PDF Only
Abstract

Suction permeameters are now commonly used for measuring unsaturated hydraulic properties of soil. The hydraulic conductivity (k) is calculated from the steady state flow rate of water through a core of soil which has a permeameter on the top and which is open to the atmosphere at the bottom. This arrangement means that a matric potential gradient exists across the core during steady state flow. An exact equation is derived to describe the steady state flow of water through the soil core, using k = Ks exp([alpha][psi]) as the relationship between [psi] and k, where [psi] is matric potential, Ks is saturated hydraulic conductivity and [alpha] is a soil parameter. The exact equation is rearranged to solve for k and [alpha]. The equation for [alpha] is not a closed form equation but can be solved by iteration. An iterative scheme is presented, and an example of its use given, k is calculated for a range of values of [alpha] and matric potential and compared with an approximate equation for calculating k. The results show that the approximate equation gives large errors if [alpha] > 20 m-1.

(C) Williams & Wilkins 1991. All Rights Reserved.