More on low numbers in the ICOLD report

August 1, 2012

To the editor: I second Allan Breitenbach’s comments about ICOLD underreporting the number of large GSS [geomembrane sealing system] dams—more than 20m high—in its 2010 Bulletin. Allan and I recently researched a paper (to be published in a pending issue of Mining Engineering magazine) of impounding valley leach facilities and found at least 12 meeting …

Good to see this kind of publication

To the editor: I enjoyed your editorial in the June/July issue of Geosynthetics. With so much garbage eye-candy on the Internet pretending to be newsworthy, it is good to see a publication that is science-based yet practical. Thanks and keep up the good work! Paul Wilkerson, P.E. Chief of Planning & Development Metro Parks–Serving Summit …

Surprised by low numbers in ICOLD report

June 1, 2012

To the editor: I read the “2010 ICOLD Bulletin on geomembrane sealing systems for dams” article with great interest (April/May, 2012). Good article to have presented, but I was a little surprised by the low numbers of geomembrane-lined earth- and rock-fill dams listed [in] the 2010 ICOLD Bulletin. ICOLD defines “large dams” as more than …

Well done, lessons learned

To the editor: With the sun shining and birds chirping, I took my April/May issue of Geosynthetics from my mailbox directly to my favorite reading chair. Intrigued by your editorial and the cover image of a massive 90.3-acre earth wound, the article “Closing the A&L Salvage Landfill: An unprecedented design-build regulatory effort” resonated my subconsultant …

Which test?

April 1, 2012

Editor’s Note: The following question was posted on the Geosynthetics Facebook page. Question Can you please tell me Std-OIT and HP-OIT for a pure unstabilized PP resin? Answer The HP-OIT test is preferred for long-term antioxidants that are sensitive to the high temperature of melting in the Std-OIT test. For unstabilized PP and PE, the …

Author answers question regarding dams “post-construction”

February 1, 2012

Editor’s Note: A question was posed regarding the article “Geotextiles in dams: Forging federal guidelines,” by Douglas Crum, (August/September 2008, Geosynthetics). Question I am curious to know more about the post-construction issues here. What kinds of guidelines exist or should exist? David M. Reply (from the author) David, One thing about water resource dams is …

Answers regarding Geosynthetic Institute specs

Editor’s Note: Comments posted on topics from the GMA Techline are answered by Dr. Robert Koerner. Comment We request you to kindly send us the GRI-approved grades for manufacturing HDPE geomembrane as per GM13. Dilip, India Reply The GRI–GM13 specification is a template of required properties for a manufacturer to meet or exceed. If your …

Facilitating interaction between engineers and contractors

October 1, 2011

Editor’s Note: Bob Koerner wrote about the Geosynthetics Institute‘s second Inspector Certification Program in the August/September 2011 issue of Geosynthetics and he responds to this query. Question From: Chet Soydemir To: Ron W. Bygness Subject: GSI News Dear Editor of Geosynthetics: I read with great interest the “GSI News” section prepared by Dr. Robert Koerner …

Geo-Frontiers 2011: A Geo-Success!

Editor’s Note: North American Geosynthetics Society president, Dean Sandri, originally wrote about Geo-Frontiers 2011 for IGS News. He, and IGS News, agreed to the revised printing of his commentary via this letter to the editor. To the editor: If you were there, you know it was a geo-success! Kudos to organizers Industrial Fabrics Association International …

Kwig, Alaska, article is popular with readers

August 1, 2011

Editor’s Note: “Tales from the tundra” prompted the following questions and comments. Question From: Reza RE: fill materials for cell web in Kwig? Dear Cory, This was a wonderful story! Are there any gravel materials for cell web filling? Also, did you use any nonwoven geotextile for separation? Response From: Abbie Yarger, IFAI Web content …