
ALL GEOSYNTHETICS Reference Manual Final August …
A recent development is the Flexible Wall GR test (Harney and Holtz, 2001, Bailey et al., 2005, and Harney et al., 2007). This test coines the best features of the GR test (D 5101) and the flexible wall permeability test (D 5084). Just as with the GR test, multiple ports are placed along the soil column to accurately determine head losses.