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Critter control and membrane repair
June 1st, 2013
From the GMA Techline RE: Critter control Have you ever heard of an instance where critters (groundhogs, for instance) dug through a geomembrane cap? [We have heard] stories about membrane repair in response to rats and groundhogs. The rats were trapped in a lined floodwall berm. The groundhogs are more disturbing. We have those everywhere. […]
Leakage rates for pond liners
June 1st, 2013
GMA techline answers from Bob Koerner RE: Leakage rates for pond liners Do you have any data or know a source on typical ranges of leakage rates through geomembrane-only pond liners for raw water (nontoxic, nonwaste)? Thanks and best regards. (Gary | USA) Reply: We have exactly what you are looking for (at least I […]
Passing peel separation, 4 out of 5?
June 1st, 2013
From the GMA Techline RE: 4 out of 5? A question about the Table 1(a) of GM19, page 9 of 13. Regarding passing peel separation %—do 4 out of the 5 specimens have to pass the 25% or less requirement? Or is that only for the strength criteria? (Sam | Maryland) Reply: In all honesty […]
Geogrid lateral load?
June 1st, 2013
From the GMA Techline RE: Geogrid lateral load? I have proposed a GRS wall to replace a cut fill failure. Our geotechnical division says it will not hold the lateral load of the surcharge of a car or truck. It will be 6 feet deep, 8 feet wide, and 90 feet long. We will excavate […]
How tubular drainage geocomposite was used in landfill final cover
June 1st, 2013
A first for landfills in the southeastern United States. By Thomas B. Maier, P.E., and Stéphane Fourmont Introduction In landfill final cover systems, geocomposite drainage products are frequently used as a drainage layer above the geomembrane layer and for surficial landfill gas collection, either in strips or as a continuous layer, below the geomembrane. For […]
Dominican Republic farm road improved with new retaining walls
June 1st, 2013
Geogrid reinforcement improves access. By Ángel Conde Introduction The 25-km dirt road from Jarabacoa to Constanza in the mountainous central region of the Dominican Republic has long been a lifeline for local farmers transporting their bananas, vegetables, strawberries, coffee, and flowers. But the road suffered from landslides, severe erosion, and uneven surfaces, which slowed the […]