Embalse El Yeso reservoir in Santiago Chile

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The El Yeso reservoir is an artificial reserve of water accumulated by a dam located in the Andes mountain range .
The reservoir is located in the place called Boca del Valle, located 23 km upstream from the junction of the Yeso River with the Maipo River , 1 at an altitude of 3000 meters above sea level, in the commune of San José de Maipo , Cordillera Province. , Santiago Metropolitan Region . It was built to provide security for the area's drinking water supply and irrigation.

Dam
The dam is an earth dam , with an inclined clay core with a length of 350 m, a height of 62 m, 6 m wide at its crest and a wall volume of 1,560,000 m³. The slope facing the water is protected by a layer of rockfill with a variable thickness of between 0.40 and 1.0 m, and downstream with rockfill one meter thick. The storage capacity of this reservoir is 250 million cubic meters. 1

Hydrology
The reservoir basin has an average elevation of 4000 meters above sea level and an area of ​​360 km², to which a snowy hydrology is attributed due to its high altitude. Its average annual flow entering the reservoir is 10 m³/s and its highest magnitudes occur between December and January. 2​ Its storage capacity amounts to 250 hm³.