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The 130 m high Punt dal Gall dam is located at the Swiss-Italian border in the South-eastern part of Switzerland and was completed in 1969. The dam is founded on highly folded and partially crushed dolomite and limestone formations. A grout curtain with an area of 120,000 m2 was provided for controlling seepage. For the monitoring of the dam deformations five inverted pendulums were installed in the...