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

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

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Accepting Special Wastes and Stability - Trimmed
Timothy D. Stark, Ph.D., P.E.,F.ASCE 

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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.

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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

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

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TECH CORNER

Ask the expert...
Tim Stark, FGI Technical Director

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

FGI TECHNICAL DIRECTOR

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

Pond Leakage Calculator - Fabricated Geomembranes
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.
 Calculator
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Temporary Landfill Covers - Design & Construction

Accepting Special Wastes and Stability - Trimmed
Presentd by Timothy D. Stark, Ph.D., P.E.,F.ASCE 
Recorded on October 24th, 2019
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News

FGI Welcomes Peak GeoSolutions

The Fabricated Geomembrane Institute (FGI) is pleased to welcome its newest associate member, Peak GeoSolutions (Peak).  Peak was founded in 1993 with the idea of elevating the role of on-site personnel by placing strong technicians in the field and empowering them to supplement their basic CQA duties with a leadership role in managing the project.  Peak prides itself on training and encouraging their employees to be leaders, as well as to actively search for and identify efficiencies or technical improvements to the project.  Peak has over 225 clients in the landfill space, while also providing services to the energy and oil and gas sectors. In addition to CQA and construction management, Peak is a provider of liner system leak location services and is the US distributor for the SENSOR arc-testing device. Peak is based in Wyoming and has clients in every western state.  Their FGI liaison is William Hensley, Principal and Senior Project Manager, who can be reached at bhensley@peakgeo.com. Please help us welcome Peak GeoSolutions to the FGI!!!!

FGI Updates PVC Geomembrane Specification

The Fabricated Geomembrane Institute (FGI) updated its Material Specification for New PVC Geomembranes, previously referred to as PGI 1104 and FGI 1117.  The new specification, FGI 9119, addresses camber or layflat, film gloss, shore hardness, and color deviation within a manufactured lot.  The new specification introduces the FGI Circumference Test which measures the roll circumference at the ends and several points along the roll to maintain roll straightness or decrease camber.  FGI 9119 also includes requirements for film gloss to reduce blocking or sticking of the geomembrane upon unrolling.  A Shore Hardness requirement was also added to improve handling and welding of the geomembrane.

The new specification can be downloaded for free by clicking here.

About the FGI:

The FGI is dedicated to advancing the use of fabricatedgeomembranes through education, research, and technology transfer.  The FGI is a non-profit consortium of manufacturers,fabricators/installers, designers, regulators, and material suppliers offabricated geomembranes.  

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Resources

Pond Leakage Calculator

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

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FAQs

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

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Specifications & Guides

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

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Geomembrane Guide

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

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