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| Embalse El Yeso | |
|---|---|
| Name | El Yeso Reservoir |
| Location | Santiago, Chile / Metropolitana de Santiago |
| Coordinates | 33, 18, S, 70... |
| Type | Reservoir |
| Inflow | Yeso River; Río Mapocho basin |
| Outflow | Yeso River |
| Catchment | Andes Cordillera de los Andes |
| Basin countries | Chile |
| Length | 6 km |
| Area | 7.5 km² |
| Max-depth | 120 m |
| Volume | 250e6 m³ |
| Elevation | 2,560 m |
Embalse El Yeso is a high-altitude reservoir in the Cordillera de los Andes near Santiago, Chile that serves as a key water storage and supply facility for the Metropolitan Region of Santiago. Situated in the upper Mapocho River watershed, it regulates flow from glacier- and snowmelt-fed catchments and supports urban, industrial and agricultural uses in downstream Santiago Metropolitan Region. The reservoir is also notable for its alpine scenery, engineering design, and role in regional water security amid climate change and Andean glaciation retreat.
El Yeso lies within the eastern slopes of the Cordillera de los Andes inside the Catillo de Pirque and San José de Maipo administrative areas of the Metropolitana de Santiago. The site occupies a glacially carved valley fed by the Yeso River and numerous seasonal tributaries originating near peaks such as Cerro El Plomo, Cerro Provincia, and Cerro Marmolejo. The reservoir is accessed via the international route linking Santiago, Chile to the Argentina–Chile border through high mountain passes used historically during Andean expeditions and modern trans-Andean transport corridors. Surrounding landforms include moraines associated with the Last Glacial Maximum and periglacial features comparable to those documented in Patagonia and Peru.
Planning and construction of the reservoir were part of 20th-century efforts to secure water for Santiago, Chile's expanding population and industrial base, tied to broader infrastructure initiatives in the Republic of Chile. The project involved collaboration among state agencies and private contractors influenced by hydraulic engineering practices from Spain, France, and the United States. Construction phases paralleled other Andean dam projects such as Pangue Dam and Radal Siete Tazas in response to urban growth drivers including migration from Valparaíso Region and agricultural expansion in the Maipo Valley. The reservoir and associated works were commissioned to manage seasonal variability driven by El Niño–Southern Oscillation and long-term shifts in Andean glaciation.
Hydrologically, El Yeso collects runoff from high-elevation catchments characterized by snowpack, seasonal glaciers, and precipitation patterns influenced by the South Pacific High and westerlies. Water storage supports regulated releases into the Yeso River and ultimately the Río Mapocho, supplying municipal systems in Santiago and irrigation networks in the Maipo Valley. Management protocols integrate monitoring from agencies such as Dirección General de Aguas (DGA) and utilities like Empresa Metropolitana de Obras Sanitarias (EMOS) and account for scenarios modeled in IPCC assessments of climate change impacts on Andean water resources. Seasonal reservoir operations interact with hydroelectric scheduling used by companies in the Chilean energy sector.
The dam and auxiliary structures at El Yeso exemplify mountain reservoir engineering adapted to steep topography and seismicity associated with the Andean orogeny and Ring of Fire. Civil works include a concrete or rockfill dam, spillway systems, intake towers, and access tunnels comparable in complexity to works at Cajón del Maipo and other Andean projects. Design considerations referenced standards used in American Society of Civil Engineers and international seismic codes, and construction mobilized heavy equipment and logistics reminiscent of high-altitude projects in Peru and Bolivia. Ongoing maintenance addresses sedimentation, slope stabilization, and structural monitoring in collaboration with universities such as Pontificia Universidad Católica de Chile and Universidad de Chile.
The reservoir altered alpine hydrology and habitats, affecting species distributions documented in Chilean conservation assessments, including alpine flora and fauna comparable to taxa in Los Andes National Park and Yerba Loca Nature Sanctuary. Impacts include changes to riparian corridors used by native bird species and amphibians also found in Andean wetlands, and potential effects on endemic ichthyofauna in the Mapocho River basin. Environmental reviews reference Chilean regulations and organizations such as CONAF and local environmental impact assessment frameworks, and mitigation includes reforestation, erosion control, and monitoring programs by research groups at Universidad Austral de Chile and international partners studying Andean ecology and glacier retreat.
El Yeso is a destination for outdoor activities including alpine hiking, mountaineering near Cerro El Plomo, photography, and seasonal skiing access routes that tie into regional recreation networks used by residents of Santiago and visitors from Valparaíso and Argentina. Tourism infrastructure is limited and regulated to protect water quality, with day-use patterns influenced by transport links such as the Santiago–Cajón del Maipo road. Visitor interest is comparable to natural attractions like San José Volcano approaches and draws amateur naturalists, climbers associated with clubs like local chapters of the Federación de Andinismo de Chile.
Beyond utility functions supplying Santiago, Chile and the Maipo Valley agricultural sector, the reservoir has become a cultural landmark in the Cajón del Maipo region featured in media about Andean landscapes and local heritage. It supports economic activities including water provision to vineyards in the Colchagua and Maule corridors, and indirectly bolsters industries in Santiago such as food processing and manufacturing. The site figures in policy discussions with ministries like the Ministerio de Obras Públicas and Ministerio del Medio Ambiente over integrated watershed management, reflecting intersections of infrastructure, conservation, and regional development planning in contemporary Chilean governance.
Category:Reservoirs in Chile Category:Geography of Santiago, Chile