Upper Chiquita Reservoir update

October 20, 2024  |  Features

This article is a review of the Upper Chiquita Reservoir project originally constructed in 2011 and today remains one of the largest and most challenging potable-water liner and geomembrane floating cover projects installed in the United States. The reservoir liner and floating cover have been in op…
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Ballast preservation system still providing protection against ballast fouling

October 10, 2024  |  Features

In February 2023, Geosynthetics magazine published a feature article titled “Innovative solution for ballast fouling.” The feature focused on the phenomenon of ballast fouling where mud from saturated soil conditions migrates up into the sub-ballast and ballast material in rail applications. The…
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The role of a biaxial geogrid in subgrade stabilization

October 1, 2024  |  Features

In the civil engineering discipline, the challenge of constructing durable and cost-effective roadways over problematic soils is a common yet complex issue. High-plasticity clay subgrades, known for their susceptibility to moisture and subsequent weakening, pose significant hurdles. Traditional meth…
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Surface Impoundment Leak Detection

October 1, 2024  |  Q&A: GMA Techline

Q: We have a double composite surface impoundment with a leak detection between the liner system containing frackwater (brine with high chlorides content) and are seeing evidence of a leak in the primary liner after five years of excellent operations. The pond and leak detection zone (LDZ) levels ha…
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PVC Pipe Leak Repair

October 1, 2024  |  Q&A: GMA Techline

Q: Can buried PVC plastic pipe be repaired? Our pipe has been impacted after being buried for seven years and we are seeing a bit of moisture on the outside of our pressure pipe.
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Critical Geosynthetics Interface

October 1, 2024  |  Q&A: GMA Techline

Q: I have a question regarding critical geosynthetics interface for a final cover system. The cross section from top to bottom is as follows:
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Geomembrane Thermal Expansion and Contraction 

October 1, 2024  |  Q&A: GMA Techline

Q: We are installing geomembrane in extreme weather conditions. We’ve been talking to a client who has a high thermal gradient where temperatures vary in the same day from 55°C to 0°C. He’s been asking us about the thermal expansion and contraction that the geomembrane can present on the field…
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Geo Strap Strain

October 1, 2024  |  Q&A: GMA Techline

Q: We are using a 40kN polyester-coated strap for mechanically stabilized wall reinforcement. We sent the strap to a third-party laboratory for quality assurance testing, and they reported an ultimate tensile strength of 20kN (half of the project specification) and a strain at rupture of greater tha…
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Geotechnical Frontiers 2025

October 1, 2024  |  Geotechnical Frontiers Watch

By now, you’ve heard the buzz. Geotechnical Frontiers is coming back in March 2025. Hundreds have stepped forward to be part of the program as speakers, authors, instructors or session chairs. Exhibitors have been picking their booths on the rapidly filling show floor and sponsors have been decidi…
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ECTC has installation tools ready for use

October 1, 2024  |  ECTC News

Proper installation is key to all erosion and sediment control products. The Erosion Control Technology Council (ECTC) has installation guidance tools for various product technologies. ECTC is a leading industry organization home to top manufacturers of erosion and sediment control products, compone…
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