Cross Permeability Test Apparatus

Cross Permeability Test Apparatus
Cross Permeability Test Apparatus
Product Description
The Permeability of a geotextile must be substantially greater than that of the
protected soil, so that water can pass freely from the soil through the fabric
without build-up of hydrostatic pressure. A high value of the permeability of
the geotextile also infers that partial clogging will not reduce the
permeability.
Both Constant and Falling Head Permeameters are generally used for
measuring normal permeability known as permittivity. Permeability is
defined as the volumetric rate of flow of water per unit cross sectional area
under unit hydraulic head across the plain of the geotextile. ASTM 0 4491
specifies permeability test using Constant Head and Falling Head
Permeameters. The constant head test is carried out using a head of 50
mm of water. Specimen diameter is 100 mm.
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