Miosson

The Miosson is small a French Rivière which runs in the department of the Vienna (86). It is an affluent of the Clain out of Right Bank, therefore a tributary of a tributary of the the Loire by Clain, then the Vienna.

Geography

Miosson has its origin on the territory of the commune of Gizay. It has a course directed since south-east towards the North-West. It is thrown in the Clain (Right Bank) with Saint-Benoît a little upstream of Poitiers.

Common crossings

Miosson crosses the communes of Gizay, Vernon, Nieuil-l' Espoir, Nouaillé-Maupertuis, Smarves and Saint-Benoît, all located in the department of the Vienna.

Hydrology

Miosson is a river far from abundant. Its flow was observed during one 19 years period (1989-2007), with Smarves, locality located little before its confluence with the Clain. The surface taken into account is of 129 km ², that is to say almost the totality of the catchment area of the river.

The interannual medium flow or module of Miosson with Smarves is of 0,366 m ³ a second.

The river presents seasonal fluctuations of flow very marked, like most of the rivers of the basin of the the Loire. The high waters are held in winter and are characterized by average monthly flows located in a fork going from 0,541 to 0,957 m ³ a second, from December to March included (with a maximum very Net in January). As of February however, the flow drops gradually to the low waters of summer which take place from July to September, involving a fall of the monthly medium flow going up to 0,068 m ³ in August. But the fluctuations are even more marked over short periods, and according to the years.

With the low water level, the VCN3 can fall until 0,004 m ³, in the event of dry period quinquennial, that is to say four liters a second, which is of course very severe, even for such a small river. This situation is however frequent among the rivers of this area (see note).

As for the risings, they can be rather important, taking into account of course the exiguity of the catchment area of the river and the smallness of its module. The QIX 2 and QIX 5 are worth indeed respectively 6,6 and 12 m ³ a second. The QIX 10 or calculated flow of decennial rising is of 15 m ³ a second and the QIX 20 of 18 m ³ a second. As for the QIX 50, it was not calculated, for lack of one duration of sufficient observation to determine it validly (see note).

The recorded maximum instantaneous flow with Smarves was of 17,1 m ³ a second on January 1st, 1994, while the value maximum day laborer was of 16,4 m ³ a second on December 28th, 1999. If one compares the first of these values on a QIX scale exposed higher, one notes that this rising was hardly of a vicennial nature, and thus by no means exceptional, because intended to on average repeat the every 15-18 years. On the whole, Miosson is a river far from abundant. The Lame of water past in its basin is of 89 millimetres annually, which is more than three times less than the overall average of France all confused basins. It is also heavily lower than the average of the basin of the Clain (223 millimetres), of the Vienna (319 millimetres) and of the the Loire (more or less 245 millimetres). The specific Débit of the river (or Qsp) reaches only one small 2,8 liters a second and per square kilometer of basin.

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