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FHWA accepting grant applications for advanced transportation technologies

April 23, 2018

The U.S. Department of Transportation’s Federal Highway Administration (FHWA) announced April 18, 2018, it is accepting applications for grants from a pool of up to $60 million in federal funding under the 2015 Fixing America’s Surface Transportation (FAST) Act. The grants will be made to eligible entities to develop model deployment sites for large-scale installation …

A next-gen basin liner solution for the U.S. Army Corps of Engineers

April 1, 2018

There are more than 100,000 miles (> 160,000 km) of levees throughout the United States, protecting lives and property from extreme weather-related flooding. Aging infrastructure and increasingly stronger storms have intensified the need to reinforce and protect levees, and emergency responders need solutions to repair a breached levee before it results in catastrophic damage. Therefore, …

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Bituminous geomembranes on a French dam

La Galaube Dam, an International Commission on Large Dams (ICOLD) facility in the south of France, completes the hydraulic system of the Montagne Noire area and provides a total water storage capacity in excess of 283 million cubic feet (8 million m3). To supply potable water to three counties and 185 municipalities in the region, …

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Reviving the Palos Verdes Reservoir—Part 2

The October/November 2016 issue of Geosynthetics published Part 1 of this series on revitalizing the Palos Verdes Reservoir in Los Angeles County, California. That article described the approach to revitalizing the site, as well as the five-month-long geosynthetic manufacturing and fabrication phase. In Part 2, we continue to explore more of the inner workings for …

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Controlling uplifting gas bubbles in exposed geomembrane-lined ponds—Part 3

Part 1 of this series (Thiel 2017) demonstrated how the size, shape, pressure, and stresses and strains experienced by geomembrane bubbles inflated with gas could be analytically estimated. Part 2 of this series (Thiel 2018) evaluated the considerations for incorporating a gas-venting underdrain below the geomembrane liner. The current, and final, Part 3 of this …

Evaluation of geosynthetic anchor systems through pullout testing

February 1, 2018

Anchor systems are a vital portion of any erosion control program tasked with negating the effects of erosive forces on disturbed soils. Anchor systems are typically deployed in situations where a rolled erosion control product (RECP) is to be used as the primary erosion control measure. As more RECPs, especially high-performance turf reinforcement mats (HPTRMs), …

Riverbank erosion protection using engineered geosynthetics in Mexico

The Río La Antigua is a river that flows through a low-lying region in the Mexican state of Veracruz, which has the historical importance of being one of the first regions where Hernán Cortés landed in the early 1500s. The Casa de Cortés is a popular tourist attraction, and the village of La Antigua’s economy …

A risk assessment for MSE wall projects

During the past 40 years, mechanically stabilized earth (MSE) walls have gained wide acceptance within the public and private sectors, becoming the standard of practice for filled walls. The evolution away from the concrete cantilever wall has occurred primarily because MSE walls are less expensive to construct and easier to design and build. The Federal …

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GMA Techline

Determining quantity of recycled HDPE in a geonet Q: I have a question about high-density polyethylene (HDPE) geonets. Is it possible, by thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) analysis, to determine the quantity of recycled HDPE present in a geonet? I have a geonet that, I think, is made with virgin and recycled …

Part 2: Controlling uplifting gas bubbles in exposed geomembrane-lined ponds

Part 1 of this series in the October/November 2017 issue of Geosynthetics demonstrated how the size, shape, pressure, and stresses and strains experienced by geomembrane bubbles surrounded by a confining fluid could be analytically estimated. Two different field case histories exhibiting the extremes of bubble sizes in ponds lined with 60-mil (1.5-mm) high-density polyethylene (HDPE) …