Céou

The Céou is a French Rivière which runs in the departments of the Lot (46) and of the the Dordogne (24). It is an affluent of the the Dordogne out of left bank.

Geography

Céou occurs with Montfaucon, small town of the Western part of the Causse of Gramat, less than fifteen kilometers in the south-south-west of Rocamadour. It is thrown in the the Dordogne (left bank) with Castelnaud-the-Vault, 5 kilometers in the west of Domme and ten kilometers in the south-west of Sarlat-la-Canéda.

Hydrology

Céou is a not very abundant river. Its flow was observed over one 40 years period (1968-2007), with Saint-Cybranet, locality located little before its confluence with the the Dordogne. The catchment area of the river is there of 603 km ² is it quasi totality of this one.

The interannual medium flow or module of the river with Saint-Cybranet is of 3,44 m ³ a second.

Céou presents seasonal fluctuations of flow marked enough, with one period of high waters of winter-spring carrying the average monthly flow on a level located between 4,1 and 7,36 m ³ a second, from December to May included (with an in February maximum). As of at the end of May the flow decreases quickly to lead to the period of the low waters which proceeds July at September, accompanied a fall by the monthly medium flow going up to 0,454 m ³ in August, which is not extremely severe for a river of this size. However the fluctuations of flow can be much more important according to the years and over shorter periods.

With the low water level the VCN3 can fall until 0,009 m ³, in the event of dry quinquennial period, that is to say 9 liters a second, which must be regarded as very severe, the river being of this almost dry fact. The VCN3 is the past minimal quantity or minimal flow over three days consecutive.

As for the risings, they can be very important taking into account the size of the catchment area. The QIX 2 and QIX 5 or calculated flows of biennial and quinquennial rising are worth respectively 44 and 67 m ³ a second. The QIX 10 or calculated flow of decennial rising is of 83 m ³ a second, the QIX 20 of 98 m ³, while the QIX 50 is assembled to 120 m ³ a second (see note). what means that one has to expect every 5 years a rising of about 67 m ³ a second, and every twenty years with a rising of almost 100 m ³ a second.

The recorded maximum instantaneous flow with Saint-Cybranet during this 40 years period, was of 104 m ³ a second on January 10th, 1996, while the recorded maximum daily output was of 89,2 m ³ a second on January 11th of the same year. If one compares the first of these values on a QIX scale of the river, one notes that this rising was a little more than of a vicennial nature, and thus intended to reproduce the every 20-25 years.

On the whole, Céou is a not very abundant river. The Lame of water past in its catchment area is of 180 millimetres annually, which is definitely lower than the French average all confused basins, but also very largely lower than the average of the basin of the the Dordogne (623 millimetres with Bergerac). The specific Flow of the river (or Qsp) reached of this fact the poor figure of 5,7 liters a second and per square kilometer of basin.

References

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