Floating cover system used for evaporation and algae control at Australian winery pond

October 1, 2006

Problem: An Australian vineyard was experiencing significant evaporation loss, as well as algae growth, from an on-site irrigation pond. To address the situation, a floating cover system for the pond was designed and installed at the vineyard in the Barossa wine region northeast of Adelaide in the state of South Australia. Floating covers can be …

San Diego Bay gets an underwater facelift

Geotextile cap is a key to this novel seafloor remediation project. By Sarah O’Connor, Michael Whelan and Ron Bygness Overview This project included aquatic remediation of a former shipyard area consisting of approximately 3,500 tons of underwater demolition, 35,000 yds.3 of dredging of contaminated material with upland disposal, and placement of a new structural cap …

Geotextile specifications

From the GMA Techline Subject: Definitions I am looking for information on geotextile specifications, specifically permittivity and permeability. Can you point me to a document? (John, New York) Reply: The specification that you want is AASHTO M288 that addresses various highway-related applications such as drainage and erosion control. Included are both of the parameters you …

Filter bags for ditch checks

From the GMA Techline Subject: Filter bags for ditch checks We are looking for a type of geotextile fabric to specify for filter bags for temporary ditch checks. What we are looking for is a type of geotextile fabric that allows some water flow, probably about the same size opening as an FF-type fabric that …

Waterproofing membrane liner for a salt storage building

From the GMA Techline Subject: Waterproofing membrane liner for a salt storage building We are required to specify the above to be installed beneath an asphalt pavement floor of a proposed salt storage facility. What would be an appropriate product and specification for installation in accordance with best industry practices? (Colin from New York) Reply: …

Arizona road

From the GMA Techline Subject: Arizona road I am a design engineer working on a road construction project in Arizona. The existing road is to be rebuilt, with 6 inches of asphalt concrete (AC) over about 12 inches of existing base. The city is concerned with groundwater and has instructed us not to remove more …

Evaluating the cost-effectiveness of four pavement treatments

Selecting a smart and efficient road-maintenance strategy. By Jamie Swedberg, Ron Bygness, and C. Joel Sprague A study evaluating the cost-effectiveness of using paving fabrics in roadway maintenance projects is getting a new look. The original work was a comprehensive study of pavement repair materials and methods. It examined maintenance treatments on 370 roads in …

Geocomposite capillary barrier drain (GCBD) for limiting moisture changes in pavements

Evaluation of a prototype. By Ruth Roberson, John Stormont, and Karen Henry Abstract Excess moisture coupled with inadequate drainage are believed to be the primary causes of roadway distress and failure. Manifestations of moisture-related distresses such as rutting, potholes, longitudinal and shrinkage cracking are commonly observed in bituminous pavements. In concrete pavements, moisture-related distresses are …

Hereford Inlet seawall repair project

August 1, 2006

Marine mattresses on the seawall in New Jersey. North Wildwood, N.J. Location: Hereford Inlet is located on the New Jersey coastline, near the southeasternmost tip of the state, near Cape May. Application: This project involved reconstructing the inlet’s shoreline seawall (Photo 1). Portions of the structure were undermined by tidal scour and storm erosion. Failure …

Designing for geoelectrical liner integrity and leak-location surveys

What to look for (and to look out for!) when designing lining systems for electrical integrity/leak-location surveys. By Ian D. Peggs As the need to perform geoelectrical liner integrity (for CQA) and leak-location (problem resolution) surveys becomes more of a regulated requirement, it becomes more necessary to design lining systems so that single and primary …