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
Material
Geocomposite, Geocomposite
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.
Number of Test Specimens
3 machine direction 3 cross machine direction; however, in practice, typically 1
Test Specimen Size
12" x 12"
Keywords
flow rate, transmissivity