For a falling-head permeability test, the following values are given: • Length of specimen
8 in. • Area of soil specimen
1.6 in.2 • Area of standpipe
0.06 in.2 • Head difference at time t
0
20 in. • Head difference at time t
180 sec
12 in. Determine the hydraulic conductivity of the soil in in./sec

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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.