Turdine

Geography

Turdine is born in the southern borders from the mounts from the Beaujolais, in the south of the collar of the Pine Bilge, on the territory of the commune of Joux. As of its birth, it adopts the direction of the east-south-east, orientation which it does not leave any more until the end of its course. It ends up throwing in the Brévenne with Arbresle.

Common crossings

Turdine crosses or skirts the following communes, of upstream downstream:

Joux, Winnowing machine, Enlightened Saint-Marcel-the, Pontcharra-on-Turdine, Saint-Forgeux, Saint-Wolf, Saint-Romain-with-Popey, Bully, Savigny and Arbresle, all located in the Department of the Rhone.

Hydrology

Turdine is a very irregular river, following the example its neighbors of the Eastern edge of the Massif Central. Its flow was observed during one 21 years period (1987-2007), with Arbresle, locality of the Département of the Rhone located at the level of its confluence with the Brévenne. Surface thus studied there is of 161 km ², that is to say it quasi totality of the catchment area of the river.

The interannual medium flow or module of the river in Arbresle is of 1,45 m ³ a second.

Turdine present of the seasonal fluctuations of flow extremely marked, as it is of rule in the area of the mounts of the Beaujolais wine. The high waters are held in winter and in spring, and are characterized by average monthly flows going from 1,77 to 2,36 m ³ a second, from November to April included (with an in January maximum). From the second part of March however, the flow decreases gradually, and this fall is prolonged throughout spring to low waters of summer. Those take place from July to September included, involving a fall of the average flow monthly to the floor of 0,278 m ³ in August, which remains rather consistent. But these monthly averages occult fluctuations much more marked over short periods or according to the years.

With the low water levels, the VCN3 can fall until 0,025 m ³ a second (25 liters), in the event of dry period quinquennial, which is severe, the river then being very thinned down. But this fact is frequent among the rivers of the area (see note).

As for the risings, they can be extremely important, taking into account the smallness of the catchment area. The QIX 2 and QIX 5 are worth respectively 23 and 36 m ³ a second. The QIX 10 or calculated flow of decennial rising is of 45 m ³ a second, the QIX 20 of 53 m ³, while the QIX 50 is assembled to 64 m ³ a second (see note).

The maximum instantaneous flow recorded in Arbresle was of 69,5 m ³ a second the 10 June 2000, while the value maximum day laborer was of 60,7 m ³ a second on December 2nd, 2003. If one compares the first of these values on a QIX scale of the river, one notes that this rising was definitely higher than the value defined by the QIX 50, and thus very exceptional.

Turdine is a relatively abundant river. The Lame of water past in its catchment area is of 288 millimetres annually, which is somewhat lower than the overall average of France, and also to the average of the basin of the the Saone (501 millimetres in Lyon) and of the Azergues (300 millimetres). The specific Flow (or Qsp) reached the figure of 9,1 liters a second and per square kilometer of basin.

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