Marmore Falls is a waterfall controlled flow , among the highest in Europe , relying on a vertical drop of 165 m , divided into three jumps .
It is located about 7.5 km away from Terni , in Umbria , near the end of Valnerina , the long valley carved by the river Nera .
The name comes from the calcium salts present on the rocks that are similar to white marble .
The waters of the waterfall are intensively exploited for the production of electricity , in central Galleto . This causes the waterfall real does not constantly working, but for most of the time is reduced to the size of a stream. The basin of Lake Piediluco acts as a reservoir for the power plant , built in 1929 , capable of producing electricity with a capacity of about 530 MW . To regulate the operation of the station and to allow the vision to all , in times and dates stated , the waterfall is operated at maximum capacity : a beep warns of the opening of the floodgates of regulation, and within minutes the flow rate increases up to maximum value . Normally , the cascade works a few hours a day , with extended operating hours during public holidays . You access the best vantage points upon payment of an entrance fee