| Alesani Reservoir | |
|---|---|
| Réservoir d'Alesani (French) | |
 Alesani Reservoir seen looking northwest fromChiatra. Above, the road fromSant'Andréa-di-Cotone toOrtale. | |
  Alesani Reservoir  Alesani Reservoir | |
| Location | Corsica |
| Coordinates | 42°17′54″N9°28′33″E / 42.29839°N 9.47577°E /42.29839; 9.47577 |
| Type | Reservoir |
| Primary inflows | Alesani River |
| Primary outflows | Alesani River |
| Catchment area | 56 square kilometres (22 sq mi) |
| Basin countries | France |
| Surface area | 49 ha (120 acres) |
| Water volume | 11,300,000 cubic metres (400,000,000 cu ft) |
| Surface elevation | 165 m (541 ft) |
Alesani Reservoir (French:Réservoir d'Alesani) orAlesani Lake (French:Lac de l'Alesani) is a reservoir in theHaute-Corse department of France formed in 1970 by damming theAlesani River with theAlesani Dam (French:Barrage d'Alésani). It is the main source of irrigation water along the east coast of Haute-Corse, and it also supplies water for human consumption and hydroelectric power generation.
The Alesani Reservoir is to the north ofChiatra and east ofPietra-di-Verde.The Alesani enters the reservoir from the northwest. The Spiscia and Mighiarette streams enter from the southwest.The D517 road crosses the dam at its east end.[1]The dam is in the commune of Chiatra.The reservoir has a surface area of 49 hectares (120 acres) and a capacity of 11,300,000 cubic metres (400,000,000 cu ft). The catchment area is 56 square kilometres (22 sq mi).[2]
The reservoir is impounded by the Alesani Dam (Barrage d'Alésani), a rockfill structure 65 metres (213 ft) high with a crest length of 155 metres (509 ft).The crest elevation is 165 metres (541 ft) above sea level.[3]The dam is faced with asphalt and concrete on the reservoir side.A 1.6 metres (5 ft 3 in) conduit carries water from the bottom outlet through a gallery under the embankment.[2]Construction lasted from 1964 to 1969.[2]The dam became operational in 1970.[3]The reservoir stores water for irrigation and human consumption, and powers a hydroelectric plant.[3]
The reservoir was partly drained and the dam was inspected in 2001.It was found that sediments at the toe of the dam were up to 15 metres (49 ft) thick, caused by major floods in the previous decade.The bottom valve was totally blocked and the water intake strainer was blocked for more than half its height.In the autumn the intake was heightened by 6 metres (20 ft) using a prefabricated structure.[2]In August 2020, towards the end of the irrigation season, theOffice d'équipment hydraulique de la Corse (OEHC) began to drain 3,000,000–4,000,000 cubic metres (110,000,000–140,000,000 cu ft) of water from the reservoir, lowering the water level in preparation for further maintenance work.[4]
The water is used to irrigate the fields, plantations and vineyards of the center of the eastern plain of Corsica.[5]The Alesani Reservoir supplies water by gravity.A DN 1200 pipe feeds a DN 900 pipe divided into a north and south branch.The northern branch interconnects with the Casinca perimeter, which allows gravity feed to theGolo irrigation system outside the intensive irrigation period.The southern branch is used to feed thePeri Reservoir in winter, and is interconnected with the south sector of the eastern plain, where the Bravone booster is located.The Peri reservoir has a pumping station that serves the high parts of theLinguizzetta perimeter.[6]
The Alesani Reservoir has low biological importance.[7]Flora include Cretan brake fern (Pteris cretica). Fish includebrown trout (Salmo trutta).[8]Invertebrates include copper demoiselle (Calopteryx haemorrhoidalis), willow emerald damselfly (Chalcolestes viridis) andblack-tailed skimmer (Orthetrum cancellatum).[9]
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