ECTC’s installation guidelines for sediment retention roll

August 2nd, 2011

The Erosion Control Technology Council (ECTC) has published a “General Usage and Installation Guidelines for Sediment Retention Fiber Roll (SRFR),” it announced in a July 29 press release. The guidelines are the result of consensus among SRFR manufacturers and are designed to address the needs of engineers, designers, and other end-users of these products, the […]

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GSI’s second Inspector Certification Program

August 1st, 2011

By Bob Koerner In 2006, GSI launched its first inspector certification program for the installation of geosynthetics at waste containment facilities. To be a successful candidate, the individual must provide an application verifying six months of related experience, an employer’s recommendation, and completion of a multiple-choice examination with a 70% passing grade. To date, 422 […]

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Septic system features geotextiles

August 1st, 2011

The Enviro-Septic System was invented in the small northern New Hampshire town of Whitefield by Dave Presby. Presby, president of Presby Environmental, learned a long time ago that if he built an eco-system that cleaned the effluent before it got to the soil, the results were markedly better. Geotextiles certainly helped! To quote the technical […]

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WHAT’S GOING ON HERE? What is that thing?

August 1st, 2011

Using fabrics called geotextiles By Josh Wengler, The Wayne Independent HONESDALE, PA. — Driving on Route 191 just north of Honesdale, one can’t help but notice the pipeline workers tearing up a huge swath of the hillside on the east side of the road across from the entrance to the Wayne County Fairgrounds. It’s an […]

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Sign up now for geosynthetics short courses

August 1st, 2011

The Geosynthetic Materials Association (GMA) and the North American Geosynthetics Society (NAGS) are teaming up to provide a series of 1- and 1.5-day short courses for civil engineers. The target audiences are county, municipal, and commercial engineers who work on projects requiring geosynthetic reinforcement or geosynthetic separation applications. The first course is Aug. 11–12 in […]

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Specifying allowable leakage rates

August 1st, 2011

How to avoid specifying a disaster By Glenn T. Darilek and Daren L. Laine Introduction Allowable Leakage Rates or Action Leakage Rates (ALRs) are specified for installed geomembranes to quantify the maximum allowable liquid leakage. If the ALR is exceeded, corrective action must be taken to reduce the leakage rate below the set limit. To […]

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Comparison of carbon footprints for various stormwater retention systems

August 1st, 2011

Introduction Construction materials continue to be a major source of greenhouse gases (GHG), based on the fossil fuels used in their production. As the amount of greenhouse gases generated each year continues to increase, there is a conscious effort to provide alternatives with lower carbon footprints. Geosynthetics have always provided cost-effective alternatives to traditional construction […]

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Sustainability and the fiber-reinforced soil repair of a roadway embankment

August 1st, 2011

By Garry Gregory From the Geosynthetics Research Institute’s 24th conference, 2011.The articles in this series encompass all types of geosynthetics and their applications viewed from the context of sustainability. Traditional solutions are compared with geosynthetic solutions from both cost and carbon footprint perspectives. (from the Geosynthetic Research Institute’s 24th conference, 2011) Introduction Site history Joe […]

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A better way for the Beltway

August 1st, 2011

By Alan Dinges Introduction Each day close to 50,000 motorists travel through the Telegraph Road interchange on the integral Interstate-95/495 Capital Beltway between Virginia and Maryland, south of Washington, D.C. In early 2008, extensive upgrades to the interchange began as part of a multi-year project tied to the final phase of the Woodrow Wilson Bridge […]

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Another dam question

August 1st, 2011

Editor's Note: A follow-up to this question and answer, prompted by the article "Geomembrane sealing systems for dams," came from a reader in India. Question From: Shivani Pal Geomembranes v/s concrete face in rock-fill dams? Please comment, sir, whether geomembrane can completely remove the layer of concrete face required in rock-fill dams or are they […]

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