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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Cutting edge topics presented by industry experts & scholars.


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Wednesday, November 6, 2019
Charlotte, NC
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Temporary Landfill Covers

Design & Construction
Presented by Elliot Pugh, Sales Manager at Wind Defender, LLC


Education - Research - Technology Transfer

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New: Design and Installation Detail Drawings

Details available for constructing a containment facility including pipe boots, concrete attachments, penetrations, and vent details.  Both PDF and DWG available.

View details

Geomembrane Test Method Videos Now Available

FGI has created FIELD AND FACTORY VIDEOS for the following
Test Methods:

D5641 Vacuum Chamber, ASTM D4437 Air Lance Test,
ASTM D5994 Thickness (Textured), D5119 Procedure B Thickness (Smooth), ASTM D7408 Seam Peel Strength, ASTM D882 Tensile Properties & D7408 Seam Shear Strength, ASTM D1204 Dimensional Stability, ASTM D1790 Brittleness Temperature

View Test Videos
We are a non-profit organization providing education, research, and support for the flexible and fabricated geomembrane industry.

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Ask the expert...

Tim Stark, Ph.D., P.E., D.GE., F.ASCE


Review our FAQs and you still have a question, please CONTACT US & Tim will get back to you as soon as possible...

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.

Temporary Landfill Covers Design & Construction
Presented by Elliot Pugh, Sales Manager at Wind Defender, LLC
Recorded on September 9th, 2019


FGI Summer 2019 Newsletter - Now Available

Check out the FGI's Summer Newsletter with information on Safety, the new Online PDH Program, Upcoming Webinar on Temporary Landfill Covers, Coal Combustion Residuals Short Course, Women in Geosynthetics, and more.

Newsletter - Summer, 2019

FGI Offers Short Course in Bogota, Colombia

Monday, August 12, 2019

The Fabricated Geomembrane Institute (FGI) presented a one-day short course at the Sheraton Bogota Hotel in Bogota, Colombia on 12 August 2019.  The short course was offered in collaboration with Filmtex, a geomembrane manufacturing company headquartered in Bogota, and the Colombian Chapter of the International Geosynthetics Society (IGS). The all-day short course drew 49 registrants.

The excellent and timely presentations focused on the challenges and environmental concerns associated with mining, tunneling, water, and waste containment technologies and how geomembranes and geosynthetics can be used to mitigate the concerns and risks.  The beginning portion of the short course focused on geomembrane fabrication, installation, manufacturing and geosynthetics for civil engineering applications with five (5) presentations.  Dr. Timothy D. Stark of the University of Illinois at Urbana-Champaign focused on the new FGI PVC Geomembrane Specification, factory fabrication and field installation, and the Columbus Water Reservoir Project.  Juan Cortes and Myriam Acevedo of Filmtex provided insight into the latest advancements in geomembrane manufacturing.  Camillo Marulanda of Ingetec Colombia, wrapped up the morning session with an informative presentation on the use of geosynthetics for dam applications.  

The second half of the presentations continued the focus on various applications of geosynthetics in containment applications, as well as geomembrane seaming. For example, Marina Villaroel of Alphard (Canada) gave an informative presentation on geosynthetics for mining application. Julio Ferreira of TRI Environmental reviewed the best practices for developing leak location surveys and obtaining a zero leak containment system.  Finally, Jorge Herrero Vega of Cesla Mexico, wrapped up the event with a presentation reviewing the the general concepts of geomembrane seaming followed by an interactive welding demonstration that allowed attendees to weld and test geomembranes. 

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

FGI Introduction, Activities, and Current Research - T. Stark (U. of Illinois)

Introducción sobre la FGI, sus actividadese Investigación actual

Introduction to IGS Colombia Chapter - Mauricio Rendon (IGS Colombia)

Introduccióna la sociedad internacional de geosintéticos, capítulo  Colombia.

FGI PVC Spec: scope, origin &description of properties - T. Stark (U. ofIllinois)

Presentación Especificación FGI 6119 para PVC

Factory Fabrication & Field Installation - T. Stark (U. of Illinois)

Fabricación de Páneles en Planta e Instalación

Geosynthetics in Tunnel Applications - Chungsik Yoo (IGS President)

Aplicaciones de Geosintéticos en Túneles(Videoconferencia)

PVC Geomembranes Manufacturing - Juan Cortes & Myriam Acevedo (Filmtex)

Producciónde Geomembranas de PVC

Columbus Water Reservoir & Geomembrane Seaming - T.Stark (U. of Illinois)

Reservorio de Agua en Columbus, OH y sellado de geomembranas.

Geosynthetics in Dam Applications - Camillo Marulanda (Ingetec Colombia)

Aplicación de geo sintéticos en Represas.

Geosynthetics in Waste Management - T. Stark (U. of Illinois)

Geosintéticos en Aplicaciones de Manejo deDesechos                                                                                                      

Geosynthetics in MiningApplications - Marina Villaroel (Alphard,Canada)

Geosintéticosen Aplicaciones de Minería

Leak Location for Fabricated Geomembranes - Julio Ferreira (TRI/Environmental)

Detecciónde fugas en Geomembranas

General Concepts of Geomembrane Seaming - Jorge Herrero,(Cesla Mexico)

ConceptosGenerales de Sellado de Geomembrana

Welding Demonstration - JorgeHerrero, (Cesla Mexico)

Práctica de sellado

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.