Classifying geotextiles

April 1, 2008  |  Products

From the GMA Techline Subject: Classifying geotextiles — What is a “Class A” geotextile? (Ron, Maryland) Reply: I don’t know, but it sounds pretty good! I suspect that it comes from a state specification where product values are listed in an ascending or descending order, suc…
GCLs and slope stability

April 1, 2008  |  Products

From the GMA Techline Subject: GCLs and slope stability — I’d like to find out what the current thinking is on designing for slope stability with GCLs … perhaps summarize the current stateof- the-practice regarding residual strength of reinforced GCLs used in bottom liners at land…
Geomembrane sealant to concrete pad

April 1, 2008  |  Products

From the GMA Techline Subject: Geomembrane sealant to concrete pad— This inquiry is about how to anchor geomembrane to a concrete pad, as well as rendering a perfect seal between the two to prevent water from seeping in between the concrete and the geomembrane. (Schar, London) Reply: Geomembra…
A forensic hypothetical: The case of the percolating water

April 1, 2008  |  Products

By Dov Leshchinsky Introduction Nearly every SRW system in the market has experienced some sort of failure. Like the power of chum in luring sharks, failures attract attorneys and engineering experts. Typically, the attorney for the plaintiff will compile “expert” reports providing a lis…
Geomembrane sealing systems for dams

April 1, 2008  |  Products

By Robert Koerner and John Wilkes Abstract The 2006 ICOLD Bulletin on Geomembrane Sealing System for Dams supersedes and greatly expands upon two earlier versions, published in 1981 and 1991. The 250 dams incorporating geomembranes cited in this new Bulletin include: 174 fill, 43 concrete, 32 roller…
Propex, NAUE reach agreement on geogrid distribution

February 1, 2008  |  Products

Propex Geosynthetics has reached an agreement with NAUE GmbH & Co. KG to be the exclusive distributor for Secugrid and Combigrid biaxial geogrids in the United States. The agreement took effect Jan. 1. As the exclusive distributor of NAUE biaxial geogrids, Propex will be responsible for all sale…
Here’s quite a pair: Geomembranes and butterflies

October 1, 2007  |  Products

New liner system installed in the Smithsonian’s Butterfly House Introduction This immersive exhibit explores the processes and patterns of evolution, and provides visitors with a new kind of experience in the National Museum of Natural History (NMNH)—a walk-through living butterfly house…
Geotextile for base stability

October 1, 2007  |  Products

From the GMA Techline Subject: Geotextile for base stability— I am a landscape architect and value your Geosynthetics publication in my practice. While reading the June/July issue [and the article on] roads and housing on wet soils, a current project challenge of mine came to light: How to bes…
Geotextile cushion design

October 1, 2007  |  Products

From the GMA Techline Subject: Geotextile cushion design— Using the geotextile cushion calculator on landfilldesign.com, and according to your research report, we should be using a factor of safety of 3 for cushion geotextile and the size of the protrusion height at half the height of the larg…
Geomembrane wrinkles during installation

October 1, 2007  |  Products

From the GMA Techline Subject: Geomembrane wrinkles during installation— What is the general state of practice for limiting wrinkles during geomembrane installation? What is the maximum wrinkle height that should be allowed? Should it be trapped straight up or allowed to fold over? Thanks. (Er…