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Geocomposite drain flow capacity: ISO VS. ASTM

February 1, 2014

From the GMA Techline RE: Geocomposite drain flow capacity: ISO VS. ASTM We are evaluating geocomposite drain products for underdrainage beneath geomembrane-lined ponds. This is an international project—we are considering non-North American products for which the hydraulic properties are based on EN ISO 12958 rather than on ASTM D4716. Would you kindly comment on how …

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Apparent opening size (ASTM D4751) for geotextiles

From the GMA Techline RE: Apparent opening size (ASTM D4751) for geotextiles Our specification calls for a geotextile with an AOS of #50 U.S. sieve (0.3mm). I understand that unlike the rest of the technical property values, AOS is specified by the maximum value (i.e., MaxARV not MARV). Please advise. Does it mean that I …

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More silt fence

From the GMA Techline RE: More silt fence Also, I have another question regarding geo properties and their specifications. Permittivity is an indicator of how well water can flow through the fabric. AOS is an indicator of the soil particle size held back by the fabric. The permittivity specification is a minimum value while AOS …

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Cover veneer stability and freezing

From the GMA Techline RE: Cover veneer stability and freezing I received a question recently from a regulator on whether freezing conditions could result in reduced interface shear strength between a geocomposite drainage layer and a geomembrane for a cover system with three feet of overlying soil. We have not historically seen freezing and ice …

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How tubular drainage geocomposite was used in landfill final cover

June 1, 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 …

Back to the waterfront (in Toronto)

April 1, 2013

By Ron Bygness In the October/November 2011 issue of Geosynthetics, we looked at how a popular section of Toronto was being redeveloped, thanks to the drainage power of the mighty little wick drain. The article “On the waterfront (in Toronto)” specifically featured the West Don Lands, an 80-acre area situated just inland from what developers …

Building Levee WBV-72

August 17, 2012

Post-Katrina reconstruction included 350 miles of perimeter levees in New Orleans By Chris Kelsey Introduction Following the extensive damage of Hurricane Katrina in August 2005, legislation authorized and funded the reconstruction and improvement of the levee system in the New Orleans, La. (NOLA) region. This notably ambitious engineering project established a goal to provide 100-year …

TenCate introduces new software for MSE applications

March 2, 2012

MiraSlope helps in product selection TenCate Geosynthetics unveiled MiraSlope design solutions software for mechanically stabilized earth (MSE) applications in a March 1 press release. The release said that the new software is based on state-of-the-practice design methods and can determine the optimal reinforcement configuration for simple geometries using an interactive approach. The software program can …

ADS’s Goddard named TRB emeritus member

February 8, 2012

James Goddard, recently retired from Advanced Drainage Systems Inc. (ADS) as the company’s chief engineer, was named member emeritus of the Transportation Research Board (TRB) Committee on Subsurface Soil-Structure Interaction during the TRB’s 91st annual meeting in January 2012. Goddard received the honor for his years of service to TRB, representing the corrugated polyethylene pipe …

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Application of complex reinforced structure near fault zone

February 1, 2012

This project, submitted by Ace Geosynthetics, won an Outstanding Achievement Award in the 2011 International Achievement Awards(IAA) / Geosynthetics presented by the Industrial Fabrics Association International. Each project in its own special way, exhibits outstanding innovation, technical skill and design excellence. Submissions of geosynthetics projects for the 2011 International Achievement Awards are being accepted now. …