Couze Pavin

Principal affluents

the Couze de Valbeleix

Crossed cities

Besse-in-Chandesse
Issoire: in its crossing of the territory of the commune, the couze Pavin runs in the vicinity immediate of the center town, briefly skirting to the south the boulevards having replaced the old ramparts.

Hydrology

The flow of Couze Pavin was observed over one 62 years period (1946-2007), with Saint-Floret, locality of the Département of the Puy-de-Dôme, located at about fifteen kilometers upstream of Issoire and confluence with Combining it. At this place the catchment area of the river is of 216 km ² on a total from more or less 300, that is to say 70% of totality.

The interannual medium flow or module of the river with Saint-Floret is of 4,61 m ³ a second.

Couze Pavin presents seasonal fluctuations of flow rather typical of the rivers of the French Massif Central. The high waters are located in winter and in spring, and carry the average monthly flow on a level from 6,54 to 7,42 m ³ a second, from December to April included (with an in February maximum), and low waters of summer, July to September, with a fall of the monthly medium flow up to the level of 1,45 m ³ in August.

The VCN3 can fall until 0,53 m ³, in the event of dry quinquennial period. Let us recall that the VCN3 is the past minimal quantity or minimal flow over three days consecutive.

In addition the risings can take a certain importance and are rather frequent. The QIX 10, or calculated flow of decennial rising, is of 78 m ³ a second (53 for Couze Chambon). As for the QIX 20 it is assembled to 91 m ³ (63 m ³ for Couze Chambon), while the QIX 50 is of 110 m ³ (75 m ³ for Couze Chambon), that is to say 7,3% of that of the Allier (see note). Finally the QIX 2 and the QIX 5 are worth repectivement 44 (against 28 m ³ for Couze Chambon) and 64 m ³ (against 48 m ³).

It is also interesting to make a comparison with a rather important affluent of the Seine, the the Eure. The QIX 10 of the Eure with the Cailly-on-Eure is worth 90 m ³ a second, while its QIX 50 is of 120 m ³. It is seen that the QIX 10 like the QIX 50 of Couze Pavin, small river having only one very small basin of 216 km ², reaches almost the level of those of the Eure, whereas the catchment area of this last is seventeen times wider.

The recorded maximum instantaneous flow was of 106 m ³ a second on January 1st, 1982, while the value maximum day laborer was of 76 m ³ a second on January 13rd, 1962.

The Lame of water past in the basin of Couze Pavin is of 527 millimetres annually, which is high, definitely higher than the overall average of France, but also quite higher than the totality of the area catchment Allier (326 millimetres). The specific Débit (or Qsp) is assembled at 21,3 (16,7 for Couze Chambon) liters a second and per square kilometer of basin.

References

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