Measuring Air Conductivity for Natural Soils. The objective of measuring air conductivity for natural soils was to derive a regression equation relating hydraulic conductivity and soil texture information that could be compared with the regressions derived for the synthetic soils. A series of air conductivity tests was conducted on samples collected at 15 sites with infiltration ponds. Test holes to collect soil samples were drilled to depths between 10 inches (25 cm) to 70 inches (178 cm). The depths of the test holes depended upon the physical ability to reach lower depths and the soil uniformity. The shallower depths were a result of either soil conditions that prohibited deeper depths, observed uniformity of the soil column throughout and therefore the expectation that deeper depths would not provide new soil textures, or encountering of the water table. Each test hole was visually inspected for a change in soil texture. Soil samples were taken for each soil texture throughout the soil column and identified by the soil layer and depth of the layer. The samples were air dried in the laboratory and tested for air conductivity with the air permeameter. The air conductivity test was repeated for each sample until a minimum of three consistent measurements had been obtained. Measured air conductivity and the corresponding saturated hydraulic conductivity for each measurement is given in Appendix B.
