Lai da Sontga Maria
The Lai da Sontga Maria ( [ ˌ ˌ laɪ̯dɐsɔncɐmɐ ʁijɐ ]? / I, Italian Lago di Santa Maria ) is a Swiss -made reservoir on Lukmanierpass on the territory of the municipality Medel ( Lucmagn ) in the canton of Grisons.
The 117 m high arch dam of Santa Maria of the power plants Anterior Rhine was completed in 1968. At the 560 m long wall crown the wall is 8 meters wide at the base, it measures 21 m.
In reservoir with a volume of 67.3 million m³ of clean is because Medel / Reno di Medel taken. In addition to other natural inflows still exists an approximately 5500 m long free-flow tunnel, the water from the eastern Val supplies Uffiern. The filled lake has a length of 3 km and a surface area of 177 ha
The lake is as Nalps connected by an approximately 8800 m long pressure tunnel to the north-west in the neighboring Reservoir Lai. He, together with this, and the still further west Lai da Curnera an interconnected by tubes water management system with a net capacity of 152 million cubic meters, which is used to generate peak current. The three lakes lie almost on the same level. The power generation of the power plants takes place anterior Rhine as well as a subsequent stage in the power plant located in a cavern powerhouse Sedrun.
The construction of the Gotthard Base Tunnel for NEAT in the immediate vicinity of the three reservoirs means that for safety reasons all three dams are monitored with sensors. A simultaneous rupture of all three dams could flood due to the almost the same time arriving in Vorderrheintal tidal waves the village of Disentis complete and all communities underlying ( as Ilanz, Chur) strong.
In the lake there is a tension tower, the Lucamagno line. At the dam there is also a mobile location of Sunrise / Orange / Swisscom.