Sioulet

The Sioulet is a French Rivière which runs in the Département of the Puy-de-Dôme (63). It is an affluent of the Sioule out of left bank, therefore a tributary of a tributary of the the Loire by Sioule and the Allier.

Geography

Sioulet occurs on the territory of the locality of Giat, in the Département of the Puy-de-Dôme, with the borders of the department of the Creuse. It is thrown in the Sioule (left bank) with Saint-Jacques-in Ambur, with about fifteen kilometers downstream from Pontgibaud.

Affluent

the Saunade (out of left bank)

Common crossings

Hydrology

Sioulet is an abundant river, following the example its neighbors of the area of the north of the Massif Central, resulting the strongly sprinkled heights. Its flow was observed during one 22 years period (1986-2007), with Pontaumur, locality of the Département of the Puy-de-Dôme located at ten kilometers of its confluence with the Sioule. The catchment area of the river is there of 472 km ² (either more than 80% of this one which extends on 550 km ²).

The interannual medium flow or module of the river with Pontaumur is of 6,14 m ³ a second.

Sioulet presents seasonal fluctuations of flow marked enough. The high waters are held in winter and at the beginning of spring, and carry the average monthly flow on a level located between 8,37 and 10,7 m ³ a second, from December to April included (with an in January maximum). As of May, the flow drops regularly until the period of low waters of summer, from July to September, accompanied by a fall of the monthly medium flow up to 1,16 m ³ in August, which remains consistent, it is true. But these monthly averages are only averages and occult fluctuations much more marked over short periods.

With the low water levels, the VCN3 can fall until 0,14 m ³, that is to say 140 liters a second, which is already severe, but this fact is frequent among the rivers of the area. Let us recall that the VCN3 is the past minimal quantity or minimal flow over three days consecutive.

As for the risings, they can be very important, like very often on the northern edge of the French Massif Central, whose grounds consist of not very permeable rocks. Thus the recorded maximum instantaneous flow was of 115 m ³ a second on June 1st, 1992, while the value maximum day laborer was of 84,6 m ³ a second on April 27th, 1998. The QIX 2 and QIX 5 are worth respectively 58 and 83 m ³. The QIX 10 or calculated flow of decennial rising is of 99 m ³ a second, the QIX 20 of 110 m ³, while the QIX 50 was not calculated, for lack of duration of sufficient observation to determine it with precision (see note). From where it arises that risings of June 1992, whose mention was made, were of a vicennial nature, and thus unexceptional.

Sioulet is a river abundant and well supplied with abundant precipitations on most of its basin. The Lame of water past in its catchment area is of 412 millimetres annually, which is definitely higher than the overall average of France, and also to the average of the basins Allier and the the Loire (244 millimetres). The specific Flow (or Qsp) reached of this fact the robust figure of 13,0 liters a second and per square kilometer of basin.

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