Abstract
Studies showed that sample disturbance influenced water retention, lower limit of available water and unsaturated hydraulic conductivity. Significant differences in water retention due to sample disturbance occurred more frequently at low than at high suction. Results showed that sample disturbance may influence unsaturated hydraulic conductivity by changing area of water flow and/or tortuosity. A modified Millington and Quirk method did not adequately predict measured hydraulic conductivity, in either disturbed or undisturbed soils. In view of theoretical objections to extension of capillary theory to the dry end of the available water range, and the relative ease of direct measurements, it is suggested that direct measurement is the only reliable procedure available.
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