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Lab Services: Geosynthetic testing

Lab Services: Geosynthetic testing

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Test Method Title

Test Method for Determining the (In-plane) Flow Rate per Unit Width and Hydraulic Transmissivity of a Geosynthetic Using a Constant Head

Reference Number

ASTM D4716



Test Property

transmissivity, flow rate

Description of Test

The flow rate per unit width is determined by measuring the quantity of water that passes through a test specimen in an specific hydraulic gradient. The hydraulic gradient(s) and specimen contact surfaces are selected by the user either as an index test or as a performance test to model a given set of field parameters as closely as possible. Measurements may be repeated under increasing normal stresses selected by the user. Hydraulic transmissivity should be determined only for tests or for specific regions of tests that exhibit a linear flow rate per unit width versus gradient relationship, that is, laminar flow.

Preferred Test Sample Size

Number of Test Specimens

3 machine direction 3 cross machine direction; however, in practice, typically 1

Test Specimen Size

12" x 12"


transmissivity, flow rate

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