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An interactive list of geomembrane products for various applications. Read more
The FGI Equipment Guide
An interactive list of welding equipment and products for fabricated geomembranes. Read more
The FGI Pond Leakage Calculator Geomembranes v. Compacted Clay Liners
Fresh water is a precious resource with demands rising daily and supply greatly fluctuating. Only two (2) percent of all water on Earth is fresh water with the other 98% being salt water. This 2% of fresh water is comprised of: 87% ice, 12% groundwater, and 1% rivers and lakes. Thus, only 13% of the available freshwater is readily accessible. Therefore, it is imperative that we capture and hold these limited water resources for agriculture, domestic use, and industry and also protect valuable groundwater from surface or subsurface contamination.
The FGI’s Pond Leakage Calculator is a Microsoft EXCEL spreadsheet based on Darcy's Law of Seepage and provides a comparison between leakage rates from a canal, pond, or reservoir constructed with compacted fine-grained soils and a geomembrane liner system. The Leakage Calculator allows the user to input the size of the containment basin (including length, width, depth, side slope angle and freeboard), the anticipated level of hydraulic conductivity of the compacted soil or geomembrane liner, and the relative cost of water in dollars per acre-foot of water.
The Calculator then calculates the volume of the basin in gallons, a comparison of leakage rates between the compacted soil and geomembrane liner systems in gallons, and the cost of the leakage based on the cost of water per acre-foot to replace it. This Calculator is designed to help consultants, engineers, architects, and end users decide how to line their canals, ponds, reservoirs, and basins to capture and/or protect valuable fresh water. The Calculator does not consider variances in construction quality and operational techniques on the long-term effectiveness of the chosen liner system. The FGI has additional research and publications to help with other aspects of successful water containment applications.
Types of Geomembranes Four (4) popular types of geomembranes are available for pond liner systems. These four (4) geomembranes in ALPHABETICAL order are: (1) EPDM, (2) reinforced polyethylene (RPE), (3) Polypropylene (PP), and (4) Polyvinyl Chloride (PVC). EPDM (Ethylene Propylene Diene Monomer) geomembranes are unreinforced and have been used for the construction of ponds of varying kinds. EPDM geomembranes are made from rubber and can be welded together with tape and primer. EPDM can be reinforced or unreinforced. RPE geomembranes have a high tensile strength and puncture resistance because they are reinforced. RPE geomembranes also can be welded with heat. PP geomembranes can be unreinforced or reinforced depending on the application. Reinforced PP geomembranes also have a high tensile strength and puncture resistance because they are reinforced. PVC geomembranes are also unreinforced and have been used successfully for decades in water canals, ponds, and reservoirs. PVC geomembranes can be welded with heat and/or solvents.
Please click below to access FGI’s Pond Leakage Calculator.
PANEL DISCUSSION ON CONSTRUCTING WITH FABRICATED GEOSYNTHETICS Patrick Elliott of Raven CLI Construction; Ron Frobel MSCE, P.E. of R.K. Frobel & Associates; Doug Hilts, P.E., S.E. of Hilts Consulting Group; Dan Rohe of Environmental Protection Inc.; Duff Simbeck of Simbeck and Associates Recorded on July 30, 2020
FGI Offering LIVE Virtual Panel Discussion Webinar
FGI Webinar: Panel Discussion on Constructing with Fabricated Geosynthetics - Thursday, July 30, 2020 at Noon Central Time
This first webinar Panel Discussion will assemble five (5) industry leaders to answer questions about design, specifying, factory testing, fabrication, welding, packaging, shipping, installing, field leak location testing, and maintaining factory fabricated geomembranes and geosynthetics, e.g., geotextiles, for a range of applications. The panelists will also discuss different labor rates, production per day, quality control, testing, weather impacts, wind, wrinkles and performing leak location surveys, etc. for factory fabricated versus field fabricated geosynthetics. This should result in a lively discussion about current trends in geomembranes, fabrication, testing, and installation.
Panelists: Doug Hilts, P.E. (Hilts Consulting Group) Patrick Elliott (Raven Industries) Ronald Frobel, P.E., (R.K. Frobel & Assoc) Dan Rohe (EPI) Duff Simbeck (Simbeck & Associates) Moderator: Timothy Stark, Ph.D., P.E. (Univ of Illinois at Urbana-Champaign)