Cervo (torrent)

Infobox River
river_name = Cervo


caption = The old bridge at Piedicavallo in the Valle del Cervo
origin = "Lago della Vecchia" - Prealpi biellesi (BI)
mouth = River Sesia near Quinto Vercellese (VC)
basin_countries = Italy: provinces of Biella and Vercelli
length = 65 km
elevation = 1900 m
mouth_elevation =
discharge = (mouth) 29.6 m²/s
watershed =The Cervo (Piedmontese "Sar" or "Serv") is a 65 km torrent (a form of seasonally intermittent stream) in the Piedmont region of north-west Italy. It is the principal tributary of the river Sesia, which itself is a significant tributary of the Po.

Geography

It crosses the provinces of Biella (communes of Piedicavallo, Rosazza, Campiglia Cervo, Sagliano Micca, Andorno Micca, Tollegno, Biella, Candelo and Castelletto Cervo) and Vercelli (Quinto Vercellese).

The Cervo’s source is the Lago della Vecchia [The "Vecchia" is an old woman of local legend, who had a bear] (close to the "Rifugio della Vecchia") in the Biellese Prealps. From the Lago della Vecchia it flows rapidly through a large number of communes of the Valle del Cervo. Close to Tollegno it receives the torrent Oropa from the right then crosses the eastern part of the city of Biella, in particular the quarter of Chiavazza.

From here the valley widens and the torrent flows more slowly along a broad and pebbly stream bed. In this section of its course the Cervo is united with a number of modest tributaries: the Mologna, the Chiebbia, the Lu Rialet, the Ostola and the Bruma. Near the small country town of Cossato the flow grows visibly when the torrent is joined from the left by the Strona di Mosso. Beyond Castelletto Cervo it enters the plain of the province of Vercelli.

In the Vercellese plain, where the Canale Cavour crosses over the torrent, the Cervo is significantly enriched by the contribution of numerous minor water courses and canals . In the area of Collobiano it is joined by more important torrents: the Rovasenda and Marchiazza from the left and from the right the Elvo, its most important tributary.

At this point the Cervo turns from a torrent into a river which can be expected to flow continuously throughout the year. It advances lazily towards the Sesia which it joins near Quinto Vercellese as its most important tributary.

Regime

Despite the Cervo’s generous mean discharge of c. 30 m³/s at its confluence with the Sesia, its regime is sharply torrential. The highest rates of flow occur with the melting of the prealpine snows in the late spring, and above all with the autumn rains. The latter can lead to such disastrous floods as occurred in 1968 and 2002. In the summer, however, the discharge is much diminished and significant tracts may dry up completely as a result of the heavy exploitation of its water.

Angling and water quality

The Cervo is classified as a “Category A” water course in the upper Valle Cervo from its source to Biella; here trout are present. Beyond Biella and in the Vercellese plain members of the carp family are found and it falls into “Category B”.

Notes and references

:"The initial version of this article was a translation of [http://it.wikipedia.org/w/index.php?title=Cervo_%28torrente%29&oldid=14189650 this version] of the article in the Italian Wikipedia."