SYMPOSIA PAPER Published: 01 January 1996
STP15598S

Geotextile Filter Design Critique

Source

The current status of design of geotextile filters in highway drainage applications is challenged in this paper by virtue of having the actual performance behavior of 91 exhumed field sites. The drainage systems investigated involved mainly highway edge drains in addition to some selected cases of retaining wall drains and erosion control systems. Considering the field data as “ground truth” information, they are compared with the existing permeability, soil retention and excessive-clogging criteria that have been proposed in the literature for design purposes. The current Federal Highway Administration (FHwA) guidelines are shown to be very suitable and perform well against the results of the field exhumed sites. It is suggested, however, that the gradient ratio test recommended by FHwA be replaced by the long term flow test or the hydraulic conductivity ratio test in evaluating the possibility of excessive clogging.

Author Information

Wilson-Fahmy, RF
Geosynthetic Research Institute, Drexel University, Philadelphia, PA, USA
Koerner, GR
Geosynthetic Research Institute, Drexel University, Philadelphia, PA, USA
Koerner, RM
Geosynthetic Research Institute, Drexel University, Philadelphia, PA, USA
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Details
Developed by Committee: D35
Pages: 132–161
DOI: 10.1520/STP15598S
ISBN-EB: 978-0-8031-5335-6
ISBN-13: 978-0-8031-2047-1