United States Bureau of Reclamation (Reclamation) frequently lines and rehabilitates open ·channels, dams, and reservoirs to conserve water and secure other benefits. Reclamation originally pioneered the development of lining technology from 1946 to 1962 when several studies were conducted to evaluate canal linings which were lower in cost than concrete. During those early years, 4,100 kilometers 6f lower cost linings and 680 kilometers of reinforced concrete linings were installed on Reclamation canals. Since then, a variety of new materials and new construction techniques have been developed and are currently being evaluated. This. paper discusses Reclamation’s experience with variou flexible geomembranes including polyvinyl chloride (PVC), very low density polyethylene (VLDPE), a composite geotextile/low density polyethylene (LDPE)/geotextile, and polypropylene (PP) for use as seepage barriers in canals with traditionally acceptable subgrade conditions. In addition, alternative construction materials and techniques used to line rigorous canal subgrades will be discussed. Finally, the paper will briefly discuss Reclamation’s use of geosynthetics in various dams and reservoirs.
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