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The distribution station of the Trinity (EDT) distributes and regulates the water coming from the station of treatment of potable water (ETAP) of the Ter (Cardedeu), to the different floors (heights or meters on the level of the sea msnm) of the arterial network of Barcelona. This infrastructure consists, among other elements, of: two underground power plants, a pumping station on the 200th floor, 5 regulation tanks, 400 m of galleries 3,000 m of pipes that connect the different functional elements of the facilities. The storage tanks of the Ter ETAP link directly to the elevation floor 130 (m.n.s.m) which is the most consumed in the network. Four alternators take advantage of the energy of the water by falling to the floors of levels 100 and 70 (mini-hydraulics). At the same time, the energy generated feeds the 200-meter drive station. This electricity production is connected to the external electricity grid and the surpluses or deficits produced are offset. Six disc shutters in parallel guarantee the entry of water into the different tanks in case of failure of the alternating groups.

The water tanks that replaced the former House Water New Trinity from 1989 are much higher capacity and are connected with a tunnel Llobregat. On its deck stood a part of solar farms to produce the electricity consumed in its operation.

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