We are a non-profit organization providing education, research, and support for the flexible and fabricated geomembrane industry.
Check out some of our research and related topics
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. Calculator
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.
Stability of Geosynthetic Lined Slopes
Presented by Dr. Timothy D. Stark
FGI Welcomes EPI
The FGI is pleased to welcome its newest fabricator member,
Environmental Protection, Inc. (www.geomembrane.com). EPI is based in Traverse City, Michigan and specializes
in high quality prefabricated geomembrane panels
used in a variety of environmental containment applications. Their FGI liaison is Dan Rohe, President, who
can be reached at firstname.lastname@example.org or (800) 655-4637. Please help us welcome EPI to the FGI!!!!
FGI Welcomes EnviroCon Systems, Inc.
The FGI is pleased to welcome its newest member, EnviroCon Systems, Inc.
(www.enviroconsystems.com). EnviroCon is a
national geomembrane supply and installation company based in Houston, Texas.
In addition, EnviroCon offers both full-service custom fabrication and pipe
divisions. The fabrication division specializes in stock and specialty
items such as sump boxes, secondary containment, and large-scale flexible liner
panels. The pipe division offers a wide range of HDPE pipe and fusion equipment for sale,
rental or turnkey services. Their FGI liaisons are Chris
Trevino, Fabrication Sales & Division Manager (email@example.com), and
Derek Huffman, Estimator/Project Manager (firstname.lastname@example.org). They can be reached
at (281) 443-2592. Please help us welcome EnviroCon Systems, Inc. to
Pond Leakage Calculator
Use our Excel calculator to learn what measurements are needed to properly plan for your pond liner project.More
Frequently asked questions from members, customers and industry professionals answered.More
Specifications & Guides
FGI, ASTM and IAGI material specifications in one place for your reference and convenienceMore
A comprehensive guide to industry and our member material offerings for fabricated geomembranes.More