In a falling head permeameter test on a fine sand the sample had a diameter of 76 mm and a length of 152 mm with a stand pipe of 12.7 mm diameter. A stopwatch was started when h was 508 mm and read 19.6s when h was 254 mm; the test was repeated for a drop from 254 mm to 127 mm and the time was 19.4s. Determine an average value for k in m/s.

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Laboratory Determination of Hydraulic Conductivity

Hydraulic conductivity is the measure of flowability of water inside the soil in the presence of a hydraulic gradient. The hydraulic gradient is defined as the difference in the water heads in the soil, which induces a water motion. In simple terms, a hydraulic gradient is the presence of a potential that induces a flow of water.