Allaine

The Allaine is a Rivière which crosses the district of Porrentruy located at the north of the Canton of the Jura in Suisse and the Territoire of Belfort in France. It takes its source with Charmoille, at an altitude of 605 meters, it is thrown then in the Doubs in France, downstream from Voujeaucourt. In France, part of its course is baptized Allan .

Its length is of 65 km, including 28 km in Switzerland. Its Bassin pouring extends on 1.120 km including 322 km in Switzerland. The French part of Allaine and its affluents represents the remainder.

Crossed localities

In Switzerland, it crosses the villages of Charmoille, Miécourt, Alle, Porrentruy, Courchavon, Courtemaîche, Montignez, Buix, Boncourt, then to France, Delle, Grandvillars, Morvillars, Sochaux and Montbeliard.

Principal affluents

Everatte with Ale;
Cornoline, the Snap ring and the Trip hammer between Ale and Porrentruy;
Voyebœuf, Bacavoine, Beuchire and Creugenat with Porrentruy;
Covatte with Joncherey (France) (Covatte is itself resulting from two rivers Coeuvatte and the Vendline which confluent in Florimont. Covatte takes its source with Coeuve and sprinkles Damphreux and Lugnez while Vendline runs of Vendlincourt);
the Bourbeuse with Allenjoie after Morvillars (it is there that it becomes Allan);
the Tasty with Étupes;
the Lizaine with Montbeliard.
the Rupt with Bart

Hydrology

The annual medium flow of Allaine, calculated over 27 years (of 1981 to 2007) with Courcelles-the-Montbeliard, right before its confluence with Doubs, is of 22,9 m ³ a second for a surface of basin of 1 120 km.

The river presents the usual seasonal fluctuations of the rivers of the continental east of France, with risings from December to March included with averages monthly from 33 to 38 m ³ a second, maximum in December - January, and of low waters of summer, from June to October included, characterized by a fall of the monthly medium flow up to 7,67 m ³ in August.

The VCN3 can fall until 1,8 m ³ in the event of dry quinquennial period. The VCN3 is the past minimal quantity or minimal flow over three days consecutive.

In addition the risings can be important. Indeed, the recorded maximum instantaneous flow was of 414 m ³ a second on February 15th, 1990. The QIX 10 or calculated flow of decennial rising is of 350 m ³ a second; the QIX 50 or flow of raw cinquantennale is of 450.

The Lame of water past in the basin is of 647 millimetres annually, and the specific flow (or Qsp) is assembled at 20,5 liters a second and per square kilometer of basin, of the rather current values to Switzerland and in the mountainous regions of France, but which are worth more of the double of the French average.

References

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