Complex geosynthetic liner system for the 70 Ranch Raw Water Reservoir

April 1st, 2022

FIGURE 1 North end of reservoir showing slope panels transitioned into bottom panels and staged cover soils placement on bottom panels Irrigation water in the western United States has always been a major concern for farming and ranching, especially in drought years. Water can be both scarce and expensive, and planning for future water storage […]

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New GSI method for strain hardening of HDPE geomembranes

April 1st, 2022

Traditionally, high-density polyethylene (HDPE) geomembranes are checked for stress crack resistance using the ASTM D5397 single point-notched constant tensile load (SP-NCTL) test (Hsuan, Lord and Koerner [1990]). This test uses notched specimens, surfactant, and elevated temperatures to accelerate the behavior and force a brittle failure in HDPE geomembranes. With today’s high stress crack resistant HDPE […]

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Welding HDPE geomembranes with biogas present

April 1st, 2022

Q: We are a Brazilian company specializing in biogas plants. We have built a big lagoon biodigester with a high-density polyethylene (HDPE) geomembrane cover. Now the cover is leaking liquid contained in the lagoon: We are organizing the repair procedure, and we would like to first investigate state-of-art practices and procedures for welding HDPE geomembranes […]

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NSF 61-certified HDPE geomembranes

April 1st, 2022

Q: Hi, we are looking for options for NSF 61-certified high-density polyethylene (HDPE) liners for installation in a potable water tank, 95th-percentile concentration of free chlorine in the tank is 1.2 ppm (1.2 mg/L). The current liner (60-mil [1.5-mm] textured HDPE, installed in 1999) is damaged and needs to be repaired or replaced. We are […]

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Methane gas geomembrane permeability

April 1st, 2022

Q: What is the least permeable geomembrane to methane gas? Regarding the permeability of geomembranes to methane gas, could you send me some technical guidelines? A: High-density polyethylene (HDPE) geomembranes are denser (more crystalline) than linear low-density polyethylene (LLDPE) geomembranes and less permeable. The water vapor, solvent and methane transmission (diffusion) of an HDPE barrier […]

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Scratch impact on HDPE liners

April 1st, 2022

Q: I have a project where multiple and extensive scratches were created on the high-density polyethylene (HDPE) liner for a reservoir due to poor construction practices. (See the following Figures 2–4.) FIGURE 2 Construction equipment that caused scratches at crest of slope FIGURE 3 Overview of scratches in 60-mil (1.5-mm) high-density polyethylene (HDPE) conductive liner […]

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Geosynthetics for stormwater tank encapsulation

March 31st, 2022

By Amy Woods, Technical Product Manager, Layfield Group Ltd., and Prabeen Joshi, Engineering Business Manager, Layfield Group Ltd. Layfield Group Ltd. discusses geosynthetics for stormwater tank encapsulation, including the pros and cons of flat bottom and arched tank types. In a typical urban setting, runoff from impervious surfaces—such as pavement and rooftops—should be managed effectively […]

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Geomembranes for agriculture protect environment

March 9th, 2022

Experts at International Cover Systems Inc. discuss two major applications of geomembranes for agriculture that protect the environment. FIGURE 1 Large geomembrane-lined agricultural lagoon before filling. Photograph courtesy of International Cover Systems Inc. Many of us love meat and dairy, but most put little thought into the waste produced by the animals that bring us these tiers […]

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GSI agriculture/aquaculture webinar upcoming

February 25th, 2022

GSI agriculture/aquaculture webinar on March 16, 2022, will focus on geosynthetics in farming and fish farming operations. A Raven Engineered Films geosynthetic agricultural silage cover. The upcoming GSI agriculture/aquaculture webinar will include such uses. Photograph courtesy of Raven Engineered Films The Geosynthetic Institute (GSI) will sponsor a webinar, “Geosynthetics in Agriculture and Aquaculture,” on March […]

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Maximizing landfill airspace with geosynthetics

February 10th, 2022

Watershed Geo ClosureTurf final cover system plays a big role in maximizing landfill airspace at two landfills on the East Coast. Illustration courtesy Watershed Geo For landfill owners and operators, maximizing landfill airspace is a critical component in contributing to the bottom line of their business. The Watershed Geo ClosureTurf final cover system eliminates the […]

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