Permeability test
General
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The
rate at which water flows through a soil is proportional to the
hydraulic gradient and is expressed by Darcy's Law as:
Equation Set 1.1: Darcy's Law
The coefficient of permeability varies with the type of soil and conditions. It is influenced by:
Empirical methods to estimate permeability using Hazen equations: Equation Set 1.2: Hazen equations
for estimating flow through graded sand filters (clean sands and gravels):
Several different laboratory testing methods can be performed to more accurately determine permeability, including constant-head and falling-head types. For our purposes, a falling-head test will be performed. The falling-head test essentially consists of measuring change in head and quantity of flow over time as follows: Equation set 1.3: Falling head test
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Apparatus
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Procedure
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References
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