Semouse

The Semouse is a small French river which takes its source on a plate (altitude approximately 550 m), with the Gérardfaing locality on the territory of the Vosgean commune of Bellefontaine, on the southern side of the Monts Sickles.

It carries on its way while crossing Bellefontaine, the valley which bears its name, and Saint-Wolf-on-Semouse (Haute-Saône). It joined the Lanterne, affluent of the the Saone to Conflans-on-Lantern.

Affluents

the Augronne, which is born with Remiremont
the Combeauté, which takes its source with the Girmont-Valley-with Ajol
the Planey, which is born with Anjeux and is joined by the Dorgeon

Hydrology

The flows of Semouse were observed during one 34 years period to Saint-Wolf-on-Semouse (of 1974 to 2007).

The average interannual flow or module of the river is there of 5,8 m ³ a second for a surface of basin of 222 km ².

The river present of the seasonal fluctuations of flow, with winter high waters from 8,27 to 9,96 m ³ from December at March included, and the thin ones of summer, in July - August-September, involving a fall of the monthly medium flow up to 1,64 m ³ in August. The VCN3 can fall until 0,56 m ³, in the event of dry quinquennial period. The VCN3 is the past minimal quantity or minimal flow over three days consecutive.

As for the risings, they can be very important. Indeed, the QIX 2 or calculated flow of rising biennial and QIX 5 calculated for a quinquennial rising are worth respectively 65 and 81 m ³. The QIX 10 or calculated flow of decennial rising is of 91 m ³ a second, the QIX 20 of 100 m ³ and the QIX 50 of 110 m ³. (see note).

The recorded maximum instantaneous flow is of 130 m ³ a second on December 30th, 2001, while the value maximum day laborer was of 84,1 m ³ a second the same day. By comparing these values with the scale of the QIX of the river, it arises that these risings were more than cinquantennales, perhaps centennial, and thus very exceptional.

The Lame of water past in this part - most important - catchment area of the river is of 826 millimetres annually, which is very high and results from an extremely abundant rainfall on this basin, located on the southern slope extremely sprinkled solid mass of the Monts Sickles. The specific flow (Qsp) is assembled thus at 26,1 liters a second and per square kilometer of basin.

References

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