1.1 This test method covers the procedure for determining the flow rate per unit width within the manufactured plane of geosynthetics under varying normal compressive stresses and a constant head. The test is intended primarily as an index test but can be used also as a performance test when the hydraulic gradients and specimen contact surfaces are selected by the user to model anticipated field conditions.

1.2 This test method is limited to geosynthetics that allow continuous in-plane flow paths to occur parallel to the intended direction of flow.

1.3 The values stated in SI units are to be regarded as the standard. The values stated in parentheses are provided for information only.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Keywords: geosynthetics; hydraulic transmissivity; in-plane flow; index test; performance test; Gradient ratio; Hydraulic conductivity/transmissivity; In-plane flow; Stress--geosynthetics; Surface analysis--soil/rock/related materials; Transmissivity and reflectivity; Compression testing--rock/related materials; Flow and flow rate--soil/rock/related materials; Geosynthetics; ICS Number Code 59.080.70 (Geotextiles)