Lac du Mas Chaban
| Lac du Mas Chaban | |
|---|---|
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| The Lac du Mas Chaban in front of Lésignac-Durand - view from the east bank | |
| Geographical location | France , Charente department |
| Tributaries | Moulde |
| Drain | Moulde |
| Places on the shore | Lésignac-Durand |
| Location close to the shore | Rochechouart |
| Data | |
| Coordinates | 45 ° 48 '18 " N , 0 ° 38' 52" E |
| Altitude above sea level | 210 m |
| surface | 1.173 km² |
| volume | 14,200,000 m³ |
| Maximum depth | 20.8 m |
| Middle deep | 9 m |
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| Map of the Lacs de Haute-Charente | |
The Lac du Mas Chaban is a reservoir of the Moulde in the Charente department in France. The dam was completed in 2000.
geography
The Lac du Mas Chaban, located at 210 meters above sea level, extends over the municipality of the municipalities of Lésignac-Durand and Massignac in the Charente department . About 3.5 kilometers to the east is the Lac de Lavaud reservoir . Both reservoirs together form the Lacs de Haute-Charente . It is 3 kilometers from the dam, built from coarse blockwork, to the left-hand mouth of the Moulde into the Charente . Not far north of the dam is the mill Moulin du Mas Chaban , after which the lake was named.
Like the neighboring Lac de Lavaud, the reservoir is divided into two very unequal halves by a road route - in this case by the D 163 from Massignac to Saint-Quentin-sur-Charente . A concrete passage within the road gravel serving as a dam enables water to be exchanged. The northern section of the reservoir is 4 kilometers long and runs in a north-south direction. The major, smaller southern part measures only 1 kilometer and ends at the east exit of Massignac on the D 13 from Massignac to Verneuil .
The surface of the reservoir is 1.17 square kilometers. Further up the river, the Moulde is dammed into three smaller ponds, its catchment area covers 52 square kilometers. Tributaries into the reservoir are Cruzeau , Mas de L'Épi , Turlut and Petit Pont .
The total volume of main and secondary storage is 14.2 million cubic meters. The flow rate fluctuates between 80 and a maximum of 2000 liters per second.
The reservoir mainly serves the increased need for irrigation in agriculture. At the same time, it has a regulating function in the water balance - in this way floods can be weakened in the winter half-year and drought can be compensated for in the summer half-year .
The Lac du Mas Chaban has hardly been developed for tourism so far. There is a public car park on the east bank and an adventure park has been set up at the southwest end in the direction of Massignac.
geology
Geologically, the Lac du Mas Chaban belongs to the crystalline basement of the northwestern Massif Central . There are mainly plagioclase-bearing paragneiss of the lower gneiss cover . These rocks are high-grade metamorphic rocks of the Sillimanite facies that emerged from Grauwacken . Their specialty are lens-like inclusions of orthogneiss and microgranites . The latter can also occur gait-like. Due to their greater resistance to erosion, the inclusions can be recognized very well as tubers in the meter to decameter range, for example along the northeast bank of the northern reservoir. On the east bank of the southern reservoir, a cataclastic shear zone runs in a north-south direction, at the north end of which a small leuco granite deposit has emerged.
ecology
The Lac du Mas Chaban is home to numerous water birds .
A new type of compressed air system was installed on the bottom of the lake to generate swelling air bubbles. This is intended to counteract any density stratification that could lead to anoxic conditions . A disadvantage that has to be taken into account, however, is greater mixing of the lake, which in turn threatens to gradually warm the water and thus cause eutrophication and the spread of pathogens.
See also
literature
- A. Bambier, J.-P. Capdeville, E. Cariou, J.-P. Floch, J. Gabilly and P. Hantzpergue: Note explicative de la feuille La Rochefoucauld à 1/50 000 . 1831 Charente limousine. BRGM, 1983.
Individual evidence
- ↑ Benoît Savy and Laurent Touchart: Les lacs à déstratificateur thermique et le cas de Mas Chaban (Charente, France) / Lakes and air bubble system: the example of the Mas Chaban reservoir (Charente, France) . In: Revue de geographie alpine . Tome 91 N ° 1, 2003, p. 81-91 , doi : 10.3406 / rga.2003.2232 .