DOWNLOAD NEWEST WEBINAR: Fabricated Geomembranes for Coal Combustion Residuals - Presented by Gary Zych of American Electric Power

Dedicated to advancing the use of fabricated geomembranes through education, research, and technology transfer.

Factory fabrication reduces field welding, reduces installation time and costs, allows modular construction and provides consistent seam and liner quality.

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Engineering Innovation Award


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Application deadline: January 15, 2019!

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FGI Creates Polypropylene Specification

The FGI has created a Standard Specification for Polypropylene Geomembranes that covers both reinforced (fPP-R) and unreinforced (fPP) flexible polypropylene geomembranes.

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Fabricated Geomembranes for Coal Combustion Residuals (CCRs)

Presented by Gary Zych of American Electric Power

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Geomembrane Test Method Videos Now Available

FGI has created videos on the following Test Methods:

ASTM D5994 Thickness (Textured), D5119 Procedure B Thickness (Smooth), ASTM D7408 Seam Peel Strength, ASTM D882 Tensile Properties & D7408 Seam Shear Strength 

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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

Geomembrane Guide

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.
Part 5 of 6: Best Fabricated Geomembranes for Coal Combustion Residuals
Presented by Gary Zych of American Electric Power


FGI is Now Accepting Applications for the Fabricated Geomembrane Engineering Innovation Award

The Fabricated Geomembrane Engineering Innovation Award was created to recognize engineers who have creatively used fabricated geomembranes to successfully fulfill a client/owner’s needs, including technical requirements, scheduling and budget.


Today’s engineers are working to solve environmental issues on a global scale. FGI’s Fabricated Geomembrane Engineering Innovation Award competition pays tribute to exemplary engineers who utilize fabricated geomembranes to creatively solve a problem on an important project.

How the Program Works

An engineer, regulatory person, owner, installer or contractor can submit a project for award consideration. An award application must be filled out and submitted by January 15, 2019. A distinguished panel of three judges representing a cross section of industry, government, academia and media, will evaluate the submissions and rank them based on engineering excellence, uniqueness and innovation.


This program is open to allengineers and designers.


The deadline for submitting anapplication is: January 15, 2019.

Apply Today

Download the award application today!!!  The FGI looks forward to recognizing an engineer/designer for their important and innovative work utilizing fabricated geomembranes.

Download Application



The Fabricated Geomembrane Institute (FGI) presented a live-streamed short course at the University of Illinois at Urbana-Champaign (UIUC) on 3 August, 2018.  The short course was organized by the FGI and was streamed on-line by the Geosynthetic Materials Association (GMA). The short course was offered as a set of six continuous webinars, with a one-hour lunch break separating the three morning sessions and the three afternoon sessions.  The all-day short course drew 210 registrants, with over 100 attendees streaming at any one time.

The excellent and timely presentations focused on the challenges and environmental concerns with containment and engineering technologies and how geosynthetics and geomembranes can be used to mitigate the concerns and risks.  Andy Durham of Owens Corning served as the emcee for the short course; introducing each speaker, as well as moderating the live question and answer section at the end of each presentation. The beginning portion of the short course focused on geomembrane life and performance.  Dr. Kerry Rowe, of Queens University focused on service life of geomembranes, while GlenToepfer, of CQA Solutions provided insight into the latest advancements in geomembrane testing and certified quality assurance (CQA) procedures.  Finally, Dr.Kerry Rowe concluded the morning sessions with an informative presentation on the effects of wrinkles on geomembrane performance.  

The second half of the presentations focused on various applications of geosynthetics in civil engineering applications.  For example, Sam Allen, of TRI Environmental reviewed the best practices for zero leak containment.  Gary Zych, of American Electric Power in Columbus, Ohio gave an informative presentation on effective disposal techniques for Coal Combustion Residuals using PVC geomembranes.  Finally, Dr. Timothy Stark, of the UIUC wrapped up the live-streamed event with a presentation detailing elevated temperatures in containment applications.  

Many attendee questions, comments, and experiences made the course a great success. The topics and speakers from the successful short course are shown below:


Service Life of  Geomembranes – Kerry Rowe (Queens University)

Testing& CQA Procedures – GlenToepfer (CQA Solutions)

Effectof Wrinkles on Geomembrane Performance – Kerry Rowe (Queens University)

BestPractices for Zero Leak Containment – Sam Allen (TRIEnvironmental)

Containmentfor Coal Combustion Residuals - Gary Zych (AmericanElectric Power)

ElevatedTemperatures in Containment Applications – Timothy Stark (UIUC)

The FGI is dedicated to advancing the use of fabricated geomembranes through education, research, and technology transfer. The FGI is an industry sponsored consortium of manufacturers, fabricators/installers, designers, regulators, and material suppliers of fabricated geomembranes. For more information on the FGI, please visit

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Pond Leakage Calculator

Use our Excel calculator to learn what measurements are needed to properly plan for your pond liner project.



Frequently asked questions from members, customers and industry professionals answered.


Specifications & Guides

FGI, ASTM and IAGI material specifications in one place for your reference and convenience


Geomembrane Guide

A comprehensive guide to industry and our member material offerings for fabricated geomembranes.