The laboratory apparatus shown in the figure below maintains a constant head in both the upper and lower reservoirs. The soil sample is a silty sand with a hydraulic conductivity k=5x10-3 cm/sec. and a moisture content of 18.5%. Specific gravity of soil sample is 2.70.

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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.