Technical Abstract: Soil pore volume as well as pore size, shape, type (i.e. biopore versus crack), continuity, and distribution in soil affect soil water and gas exchange. Vertical and lateral drainage of water by gravitational forces occurs through large, non-capillary soil pores, but redistribution and upward movement of water occurs through capillary soil pores. The purpose of this study was to develop equations to describe unsaturated hydraulic conductivity in relation to soil pore size, and to test on another data set. Three soils with three depths each were used to develop the concepts, based on water retention curve, saturated hydraulic conductivity, and bulk density measured from undisturbed cores. Unsaturated hydraulic conductivity was determined from undisturbed columns of silt loam soils using instanteous profile method based on evaporation rather than drainage. Predicted unsaturated hydraulic conductivity was point-based rather than curve-based. The non-swelling sandy loam soil had quite different predicted unsaturated hydraulic conductivity than the saline and non-saline clay soils. The predicted unsaturated hydraulic conductivity was in the vicinity of the measured data from the silt loam columns, but the overall RMSE was 1.042 for log-transformed data. The point-based unsaturated hydraulic conductivity equations were useful for fine-textured soil, and incorporated flow reduction in dry soil due to sorbed water, as well as enhanced flow through large pores at the wet end.