Ozanne

The Ozanne is a French river located in the department of Eure-et-Loir. It is an affluent of Right Bank of the Loir, and thus a tributary of a tributary of the the Loire.

Geography

The river takes its source in the Pole-Gouët and is made up of 2 arms, Suzanne or holy-Suzanne and Ozanne de Dampierre or Moranne or Mozanne which meet close to Brou. It is thrown in the Dormouse 1 km from Bonneval, with the Ouzenain locality.

Principal affluents

Pithière
the Bell

Crossed cities

Hydrology

The flow of Ozanne was observed for one 35 years period (1973-2007), with Trizay-lès-Bonneval, locality of the department of Eure-et-Loir, located very close to the confluence with the Dormouse. The catchment area of the river is of 268 km ².

The interannual medium flow or module of the river with Trizay-lès-Bonneval is of 1,50 m ³ a second.

Ozanne present of the seasonal fluctuations of flow important, with high waters of winter carrying the average flow monthly on levels located between 2,71 and 3,65 m ³ a second, from December to March included (maximum in January), and of low waters of summer, at the end of May at the beginning of October, with a fall of the monthly medium flow until 0,247 m ³ in August (247 liters a second), which is still acceptable without being severe.

However, the VCN3 can fall until 0,032 m ³, in the event of dry period quinquennial, that is to say 32 liters a second, which becomes severe (see note).

In addition, the risings can be rather important. The QIX 2 and QIX 5 or calculated flows of biennial and quinquennial rising are worth respectively 34 and 51 m ³ a second. The QIX 10 or calculated flow of decennial rising is worth 62 m ³ a second, while the QIX 20 is of 72 m ³. Finally the QIX 50 is assembled to 86 m ³ a second. (see note). The recorded maximum instantaneous flow was of 65,2 m ³ a second on January 22nd, 1995, while the value maximum day laborer was of 52,6 m ³ a second on April 10th, 1983. By comparing the first of these figures with the values of the various QIX of the river, it appears that this rising even was of a vicennial nature and thus by no means exceptional. One can consider that it is intended to on average repeat the every 10-15 years.

The Lame of water past in the basin of Ozanne is of 177 millimetres annually, which is poor, very definitely lower than the overall average of France, but also than that of the whole of the catchment area of the Loire (244 millimetres). It should be noted that it is however definitely higher than that of its neighbor the Yerre (117 mm). The specific Débit (or Qsp) is assembled consequently at 5,6 liters a second and per square kilometer of basin.

Toponymy

Mentioned under the name of Ouzanne in 1455 and of Ouzaine in 1724

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