You have been given the following constant-head data for planar flow of water in a 1.5-mm thick geotextile that is 300-mm wide by 600-mm long. Calculate the transmissivity in m3/min-m of fabric and then the planar coefficient of permeability in cm/sec.   Total head lost, Dh (mm) q (cm3/min) 75 21 150 41 225 60 300 79

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A: Hydrostatic force is given by Fh=12γWH2so,Fh∝H2when fullFh1∝H2when 34 fullFh2∝34H2

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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.