Landfill closure best practices

April 19th, 2022

AGRU America Inc. explores landfill closure regulations and requirements, highlighting landfill closure best practices from the perspective of a geosynthetics manufacturer. In partnership with Watershed Geosynthetics LLC, AGRU America Inc. has manufactured more than 1,500 acres (607 ha) of ClosureTurf engineered landfill closure systems. Photograph courtesy of AGRU America Inc. Landfill containment is a complicated […]

Read More

Inspecting a six-year-old geomembrane

April 14th, 2022

Seaman Corp. describes a rare opportunity for inspecting a 6-year-old geomembrane at the Knoxville, Tenn., World’s Fair Park. By Felon Wilson, Industrial Fabrics Business Director, Seaman Corp. WFP Park and lake in Knoxville, Tenn. Photograph courtesy of Seaman Corp. The lake at the Knoxville, Tenn., 1982 World’s Fair Park was relined with the XR-5 geomembrane in […]

Read More

Selecting a textured geomembrane

April 11th, 2022

Solmax makes the case for selecting a textured geomembrane, like the company’s FrictionFlex, based on the type of application. By Aparna Jayakumar, Technical Manager, EMEA, Solmax Textured geomembrane. Photograph courtesy of Solmax Choosing a textured geomembrane largely depends upon the type of application in which the geomembrane is being used.   The amount of interface friction […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More

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 […]

Read More