These Ospreys were giving me the evil eye as I was photographing them yesterday morning. Location was east of the fort near one of the picnic areas. Photographed this image (1/250 sec at f/8.0, ISO 100) with the Sony A7M2 using the Sony FE 70-200mm f/4 lens handheld.
The Cascata delle Marmore (Marmore's Falls) is a man-made waterfall created by the ancient Romans. Its total height is 165 m (541 feet), making it one of the tallest in Italy and the tallest man-made waterfall in Europe. Of its 3 sections, the top one is the tallest, at 83 m (272 feet).
It is located 7.7 km from Terni, a provincial capital of the Italian region of Umbria.
Its source is a portion of the waters of the river Velino (the rest of the river flows into a hydroelectric power plant), after flowing through Piediluco lake near the community of Marmore. It pours into the valley below formed by the river Nera. Its flow is turned on and off according to a published schedule, to satisfy the needs of tourists and the power company alike. Tourists try to be there the moment the gates are opened to see the powerful rush of water.
Most of the time, the water in the canals above the falls is diverted to a hydroelectric power plant, so the flow in the falls themselves is reduced to the level of a creek. Piediluco Lake, above the falls, is used as a reservoir for the power plant. The Galleto power plant, built in 1929, is architecturally interesting. Its capacity is about 530 MW. To control the operation of the power plant, and to satisfy tourists, the fall is turned on according to a set schedule, achieving a spectacular effect at full flow. An alarm is sounded first, then the gates are opened, and in a few minutes the small creek is transformed into a full-sized river rushing into the void below.
Normally, the fall is turned on between noon and 1:00 PM and again between 4:00 and 5:00 PM every day, with additional times on holidays. An entrance fee is charged to visit the falls and the surrounding area.
A path along the falls allows the visitor to hike up to the top of the falls. Along the way, a tunnel leads to an observatory just next to the falls, where a visitor is guaranteed to get soaked. A safer observatory near the top affords a grandiose view of the falls and of the Nera valley below.