Tokyo Electric Power Co., Inc. has provided a water stoppage work on the ground surface to prevent leakage through the surrounding ground of the upper reservoir of a pumped storage power plant. PVC membrane was installed to 60% of the whole area where the water stoppage work was implemented, i.e. at relatively flat portion of the reservoir bottom with a maximum water depth of 40 m. Because of the large area and high water pressure, extensive investigations were carried out through studies on case histories, various tests on mechanical and physical properties of the membrane and design considerations for protection and anchoring of the membrane. Behavior of the membrane after ponding the reservoir has _been monitored by observing leakage, ground water level, and settlement of foundation. Any behavior abnormal has never been observed yet.
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