| DESCRIPTION | |||||||||
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| The double Polycan liners (geomembranes) can be reinforced, non-reinforced, films or laminated products depending on the end use application. There are a variety of geomembranes available, including specialty grades. | |||||||||
| Case History - US Fish and Wildlife Service | |||||||||
| Client U.S. Fish and Wildlife Service, Albuquerque, New Mexico for its Tishomingo, Oklahoma, Fish Hatchery Project Lining two United States Fish Hatchery rearing ponds in Tishomingo, Oklahoma. Working Dates July-August, 1989 Synopsis Production in two adjoining fish rearing ponds was down because of water leakage through the sides and bottom of the ponds. Low water levels resulted in deficient water quantity and quality. The ponds, 1 acre and 2 acres each, required excavating to create a dry, compacted sub-base and a trench on the top perimeter. Each pond was fully lined with 40 mil HDPE. Seams were welded at the site location using the patented hot shoe split wedge heat seal, which provided an inflatable air chamber for testing the completeness of the weld and for leakage. Problems Excavation unearthed quantities of rocks capable of rupturing in the public liner as the pressure of the water was applied. The walkway perimeter slopes of the ponds were potentially unsafe for workers and animals because the liner surface was slippery especially when wet. Solution A buffer layer of 12 ounce, non-woven, needle-punched Geotextile was applied beneath the HDPE, providing a cushion from sharp-edged rocks. For traction and grip on the slopes a 3/8 inch mesh Geonet was applied over the liner around the perimeter of the ponds. Materials Geomembrane-40 mil Poly-flex HDPE, Geotextile- 12 ounce, non-woven, needle-punched, Geonet-3/8 |
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