Lago di Piediluco

Lago di Piediluco
Lago di Piediluco
	Panoramic view of the lake
	Lago di Piediluco
Location	Province of Rieti, Lazio/Province of Terni, Umbria
Coordinates	42°31′N 12°45′E / 42.517°N 12.750°E
Primary inflows	Rio Fuscello; Nera River; Velino River
Primary outflows	Waterfall Cascata delle Marmore
Catchment area	73 km2 (28 sq mi)
Basin countries	Italy
Max. length	4.1 km (2.5 mi)
Max. width	0.52 km (0.32 mi)
Surface area	1.58 km2 (0.61 sq mi)
Max. depth	19.5 m (64 ft)
Water volume	0.017 km3 (14,000 acre⋅ft)
Surface elevation	375 m (1,230 ft)

Lago di Piediluco is a lake that straddles the border between the Province of Terni, Umbria, Italy and the Province of Rieti, Lazio. At an elevation of 375 m (1,230 ft), its surface area is 1.58 km² (0.61 sq mi). The lake is formed by the inflow of water from three sources: the Rio Fuscello, the Velino river and the Nera river. The flow from the Rio Fuscello is naturally occurring, while the flows from the Nera and Velino rivers are each influenced in some part due to man-made means. A partial diversion of the Nera in the Nera river valley (Valnerina) conducts the flow via a lengthy aqueduct and canal system built in the 1920s during the fascist regime of Benito Mussolini, entering the lake at the north-western end of the village of Piediluco, near the entrance to the town from the "Via Ternana" SS79 motorway. A canal approximately 400 metres (1,300 ft) long was built, also in the 1920s, to divert the Velino river from its existing natural course into the lake. The purpose of this work was to improve hydroelectric power production.

At one time the lake was part of a much larger lake, known from Roman times as "Lacus Velinus" or Lake Velino. Lake Piediluco was formed as a result of cuts downstream from the lake that drained the waters of Lake Velino into the lower Nera River, which also created the Cascata delle Marmore waterfall. Lake Piediluco is the site of the Italian National Rowing Center, which hosts many training and competition events at the national, European, and international levels. The lake is ideal for the sport due to its shape, central geographical location, and the relatively calm winds.