Viaur (river)
The Viaur is a river south of the France.
Geography
It takes its source in the Département of Aveyron in the Regional natural park of the Large Causses to the Puech del Pal (1155m) on the plate of Lévézou, it acts also as border between Aveyron and the Tarn year downstream. It is crossed by two viaducts, the railway viaduct of Viaur which dominates it of 120 meters and the highway viaduct with Tanus. It is thrown in the Aveyron in Laguépie in the department of Tarn-et-Garonne (82).
Hydrography
Length: 168 kmCatchment area: 1530 km ²
Medium flow: of 15,2 m ³ /s in Laguépie
Hydrology
The annual medium flow of Viaur, calculated over 71 years with Laguépie (of 1937 to 2007), is of 15,2 m ³ a second for a surface of basin of 1.530 km ². The river present of important fluctuations seasonal of flow, with risings winter-spring from 26 to 32 m ³, December to May included and maximum in February, and a marked low water level of end of be-beginning of autumn, July to October, characterized by a fall of the monthly medium flow up to 2,79 m ³ in August.
The VCN3 can fall until 0,28 m ³, in the event of quinquennial dry. The VCN3 is the past minimal quantity or minimal flow over three days consecutive.
The Lame of water past in the basin is of 314 millimetres annually, which is more or less the French average. The specific Débit (Qsp) is assembled at 9,9 liters a second and per square kilometer of basin.
In Laguépie, the recorded maximum daily output was of 465 m ³ a second, on December 14th, 1981. The QIX 10, or calculated flow of decennial rising is of 390 m ³ a second.
Departments and main cities crossed
- Aveyron (12): Bridge-with-Salars, Ségur
- Tarn (81): Pampelonne, Mirandol-Bourgnounac
- Tarn-et-Garonne (82): Laguépie
Principal affluents
Principal stoppings
Crossing a solid mass raised on the remainder of the area (Lévézou), of many hydroelectric stoppings were built on its course (Bridge-of-Salars) and its affluents (Pareloup) in order to collect water of it to make it fall towards the Tarn (Factory of Pouget, 450 meters of uneven). Thus a considerable part of its flow is deviated towards the Tarn.
Other stoppings barent its course, in particular the dam Thuriès making function a hydroelectric factory.
References
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