For a falling head permeability test, these value are given:  Length of the soil specimen = 200 mm  Area of the soil specimen = 1000 mm2  Area of the standpipe = 40 mm2  Head difference at time, t = 0 min is 500 mm  Head difference at time, t = 3 min is 300 mm 1. Determine the hydraulic conductivity of the soil in cm/sec. 2. What was the head difference at time, t = 100 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.