Allaine

The Allaine in Porrentruy

Template: Infobox River / Obsolete

The Allaine ( German formerly Hall ), in the lower reaches L' Allan, is a 65 km-long right tributary of the Doubs. The source of the Allaine located in Switzerland, its estuary in France. The river is first mentioned in 1534 under the name Allain, 1774 appears the spelling Alin. The etymology of the word probably comes from the Celtic, the name means small river.

The Allaine is the main river of the Ajoie in the canton of Jura. It rises in the municipality of Charmoille to around 540 m above sea level. M. in the hills of northern Jura, which simultaneously mark the watershed between the basins of the Rhine and the Rhone. The flow occurs after a few kilometers in Charmoille in the broad and fertile basin of the Allaine one at the northern foot of the Jura mountains. Shortly before all takes on the Allaine left the Ruisseau de Fregiécourt, a stream which has its headwaters in the region of Rangiers Pass.

In Porrentruy the Allaine inflow obtained by the channeled Ajoulote. Current flows only periodically overground from the source of Creugenat, usually after prolonged rains or periods of intense snow melt. Otherwise, the water flows underground to Allaine. In downtown Porrentruy of Bach Le Bacavoine opens into the Allaine, which is also channeled and flows partially under the buildings and streets of the city. Immediately after the confluence of Ajoulote and Bacavoine makes the Allaine a sharp bend to the north and crosses now in a valley with a 300 to 800 m wide valley the Tabular Jura plateaus Ajoie. Below Boncourt she leaves after 28 km of roads Switzerland and occurs at about dent in the French Territoire de Belfort.

From here, the valley widens to more than 1 km wide valley, surrounded by gentle hills. Here flows from the right Coeuvatte, which has its origin also in Switzerland. The Allaine now gradually turns west again and reaches Morvillars the sink that the Canal du Rhone au Rhin used in the watershed of the Burgundian Gate.

After the mouth of the Bourbeuse and the transition into the Doubs river takes the name Allan. This flows together with the channel by the agglomeration of Montbeliard, it takes the Savoureuse ( most important tributary, which rises in the Vosges ) and the Lizaine on. In Voujeaucourt on the northern edge of the Jura Mountains of Allan, climaxing in the Doubs.

Especially in the Swiss section has the Allaine to a low water supply. Here it has only insignificant inflow from tributaries, because the karst soil allows infiltration of the fallen rainwater in place. In return, receive the water of the underground flowing waters Ajoulote ( at Pruntrut) and Milandrine ( at Boncourt ).

The water of the Allaine is used in multiple locations for mills, saw mills and fish farming. In France, the river feeds the Canal du Rhone au Rhin and is water supplier for some factories in the agglomeration Montbéliard.