To pare

The Doller is a French Rivière of Alsace which runs in the Département of Haut-Rhin. Its Vallée opens towards the east downstream from the Ballon of Alsace. It is parallel to the the Thur which runs a little more in north. It is an affluent of the It, therefore a tributary of a tributary of the the Rhine.

Its course

To pare takes its source on the heights of Dolleren, with the Fennematt locality with 922 meters of Altitude. Fennematt was of 1871 to 1914, a national border between the France and the Germany. To pare descends of west in is, in 46 kilometers, an uneven of 700 meters to join the It in the agglomeration of Mulhouse. Its Bassin pouring of 215 square kilometers feeds out of water 200.000 inhabitants of fifty common of which part of the Mulhousian agglomeration. To pare thus feeds the water level of Michelbach, water tank of the area of Mulhouse.

Crossed agglomerations

It bathes Sewen, Dolleren, Wegscheid, Niederbruck, Sickert, Masevaux, Lauw, Sentheim, Guewenheim, Pont of Aspach, Reiningue, Lutterbach and Pfastatt before throwing in the It.

Affluents

The tributary of left bank are: Wagenstallbach, Seebach with the Lakes Alfeld and Sewen, Soultzbach, Helmbach, Bourbach, Baerenbach, Leimbach and Dollerbaechlein. Its affluents of Right Bank: Grabenbach, Lachtelweiherbaechel, Odiliabach, Braembaechle, Talungrunzbach, Hahnenach and Steinbaechlein.

Hydrology

To pare is an extremely abundant river. Its flow was observed during one 41 years period (1967-2007), with Reiningue, locality of the Département of Haut-Rhin located at little distance to the west of Mulhouse and little before the confluence with It. Surface studied there is of 180 km ², that is to say more than 85% of the totality of the catchment area of the river.

The interannual medium flow or module of the river with Reiningue is of 4,26 m ³ a second.

To pare presents seasonal fluctuations of flow marked well. The high waters are held in winter and are accompanied by an average monthly flow located in a fork going from 6,67 to 8,20 m ³ a second, from December to March included (with an in February maximum). As of the end of March, the medium flow drops gradually until the period of the low waters which takes place in summer, from June to September included, with a fall of the monthly medium flow going up to 1,09 m ³ in August, that is to say 1090 liters a second, which remains appreciable. But the fluctuations are much more marked over short periods and according to the years.

Indeed, with the low water level, the VCN3 can fall until 0,150 m ³, in the event of dry period quinquennial, that is to say 150 liters a second, which becomes severe, but this situation frequently meets within the rivers of the east of France (see note).

As for the risings, they can be very important. The QIX 2 and QIX 5 or calculated flows of biennial and quinquennial rising are worth respectively 91 and 140 m ³. The QIX 10 or calculated flow of decennial rising is of 170 m ³ a second, the QIX 20 of 200 m ³ and the QIX 50 of 240 m ³, which corresponds to the average volume of the the Seine in Alfortville, to the doors of Paris (see note).

The maximum instantaneous flow recorded at the station of Reiningue during this period, was of 207 m ³ a second on February 15th, 1990, while the value maximum day laborer was of 172 m ³ a second the same day. By comparing the first of these values on a QIX scale of the river, it arises that this rising of February 1990 was of a vicennial nature, and thus unexceptional, intended to reproduce on average the every approximately 20-25 years.

To pare is a very abundant river. The Lame of water past in its catchment area is of 749 millimetres annually, which is extremely high in France, more twice the higher than the overall average of the country, but also than the average of the basin of the It (398 millimetres in Strasbourg) and the Rhine (approximately 375 mm in the Netherlands). The specific Flow of the river (or Qsp) thus reached the high figure of 23,6 liters a second and per square kilometer of basin.

Tourism

A tourist train, managed by association CFTVD (Tourist Railroad of the Valley To pare it), borrows since 1976, of Cernay to Sentheim, a section of old the Railway Cernay - Sewen.

The valley Doller is also famous for its population of beavers.

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