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Lake Cachí
Lake Cachi ((スペイン語:Lago de Cachí )) is an artificial lake in central Costa Rica created by the Cachí Dam (''Represa de Cach''), an arch dam which is located north of Tapantí National Park, to the east-southeast of Cartago in Cartago Province. The main town is Cachí, located away from the east bank of the lake. Built in the 1970s, it was one of the first hydroelectric projects in Costa Rica. It has an installed capacity of 102 MW with three units of 34 MW capacity each (Vertical Francis turbines).
The project became operational with the first unit commissioned in 1966, second unit in 1967 and the third unit in 1978.〔 The Reventazon River provides multiple benefits through the three dams built on it. Out of the three dams, Cachi Dam not only provides power generation benefits but also controls floods, and recreational facilities in the Lake Cachi. The Rio Macho project on the upstream provides hydroelectric power and the downstream Birris power project also provides drinking water (40% of the metropolitan city’s water supply needs).
The reservoir, located in the Rio Reventazón, is an important supplier of electrical power to Costa Rica. It is operated by Instituto Costarricense de Electricidad (ICE).
==Geography==
Lake Cachi contains the Cachí Dam (''Represa de Cach'') in the northeastern part of the lake, near the village of Ujarras along the 225 road in the middle reaches of the Reventazon River in the Ujarras valley. The lake is created by the dam on the Reventazon River as it flows in from the northeast winding through the steep-sided valley. The river has a total drainage area of lying in an elevation range varying from above mean sea level at its highest point to the lowest outflow point into the Atlantic Ocean; out of this, the reservoir created by the Cachi dam intercepts the upper catchment area of . The annual precipitation in the entire river basin varies from . In 80% of the total catchment area, the relief varies distinctly, with mountains which have slopes between 20 and 85 degrees. The average annual water inflow into the reservoir is at the rate of /second. The gross storage capacity of the reservoir is 51 million cubic metres. The design flood discharge is /sec. The reservoir has a water spread of which stretches over a length of with maximum water depth of . Sixty percent of the reservoir's catchment is forested, the remainder is agricultural land. Density currents are formed in the reservoir on account of a combination of temperature gradients and high sediment concentration.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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