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| Presa de San Juan | |
|---|---|
| Name | Presa de San Juan |
| Location | Oaxaca, Mexico |
| Type | Reservoir and dam |
| Inflow | Río Verde |
| Outflow | Río Verde |
| Construction | 20th century |
| Operator | Comisión Nacional del Agua |
Presa de San Juan is a dam and reservoir located in the state of Oaxaca, Mexico, forming an impoundment on the Río Verde. The structure functions as a multipurpose waterworks supporting irrigation, flood control, and local water supply, and it has become a focal point for regional development, ecology, and tourism.
Presa de San Juan occupies a strategic position in Oaxaca and is relevant to regional planning involving Comisión Nacional del Agua, Secretaría de Agricultura y Desarrollo Rural, Instituto Nacional de Antropología e Historia, Consejo Nacional de Ciencia y Tecnología, and Gobierno del Estado de Oaxaca. The facility interacts with infrastructures such as the Carretera Federal 175, nearby municipalities including Putla Villa de Guerrero, Tlaxiaco, Huajuapan de León, and institutions like Universidad Nacional Autónoma de México, Instituto Politécnico Nacional, Universidad Autónoma Benito Juárez de Oaxaca, and private firms engaged in water engineering.
The dam is sited within the Sierra Madre del Sur physiographic province and lies in proximity to ecological regions influenced by Bosque Mesófilo de Montaña, Tropical deciduous forest, and Zapotec and Mixtec cultural areas. Nearby geological features include the Mixteca Region, Valle Nacional, and river systems incorporating the Río Grande de Oaxaca basin. Transport and access routes connect to Oaxaca City, Salina Cruz, Juchitán de Zaragoza, Tehuantepec, and the Pacific ports of Salina Cruz and Puerto Ángel. The site’s coordinates situate it within administrative boundaries tied to Distrito Federal–era mapping and contemporary INEGI cartography.
Planning and construction phases referenced agencies such as Comisión Federal de Electricidad, Instituto Mexicano del Agua, Banco Nacional de Obras y Servicios Públicos, and programs under Plan Nacional de Desarrollo. Surveys involved collaboration with Universidad Autónoma Metropolitana, Centro de Investigación en Ecosistemas de la Montaña, and consulting firms associated with Ingeniería Civil. The project reflects policy frameworks shaped by legislative acts debated in the Congreso de la Unión and executed in coordination with the Secretaría de Desarrollo Agrario, Territorial y Urbano and local cabildos of municipalities like San Juan Bautista Suchitepec and San Pedro y San Pablo Teposcolula. Construction incorporated technologies and contractors that previously worked on projects like Presa La Angostura, Presa Infiernillo, Presa El Cajón, and Presa Plutarco Elías Calles.
Engineering design drew on standards promulgated by Comisión Internacional de Grandes Presas, with inputs from firms linked to Lloyd’s Register, Black & Veatch, and academic groups at Massachusetts Institute of Technology and University of California, Berkeley during technical exchange programs. Structural typology aligns with concrete gravity and earthfill precedents exemplified by Hoover Dam and Guri Dam, while instrumentation echoes protocols used in Paraná River basin projects. Specifications include spillway design comparable to those of Presa El Molinito and outlet works sized for irrigation districts similar to those served by Sistema Cutzamala.
Hydrologic modeling for the reservoir used datasets from Servicio Meteorológico Nacional, CONAGUA, and Comisión Nacional Forestal, integrating paleohydrology records akin to studies of the Río Balsas and Río Usumacinta. Seasonal inflow patterns reflect precipitation regimes influenced by the Intertropical Convergence Zone and El Niño–Southern Oscillation events monitored by NOAA and CICESE. Reservoir metrics track storage, evaporation, and sedimentation processes examined in comparative literature on reservoirs such as Lago de Chapala, Presa Malpaso, and Presa La Villita.
Operational priorities coordinate CONAGUA water rights, irrigation districts administered through Liderazgo Agrícola cooperatives, and municipal supply contracts with towns like San Pedro Ixcatlán. The site intersects with energy planning though it is primarily non‑federal hydroelectric development; it informally connects to the national grid managed by Comisión Federal de Electricidad and energy policy dialogues involving Secretaría de Energía. Management practices align with adaptive strategies advocated by Programa Nacional Hídrico and community water committees influenced by models from Ejido governance and agrarian reform histories tied to Revolución Mexicana legacies.
Environmental assessments engaged with CONANP, SEMARNAT, and academic partners such as El Colegio de la Frontera Sur and Centro de Investigaciones en Ecosistemas. Impacts include habitat alteration affecting species documented by Instituto de Biología (UNAM), migratory birds tracked by International Union for Conservation of Nature, and fisheries comparable to those monitored in Laguna de Catemaco. Social effects involved resettlement negotiations with communities akin to disputes recorded near Presa La Yesca and cultural heritage considerations consulted with Instituto Nacional de Antropología e Historia and local agenencias municipales representing Zapotec and Mixtec stakeholders. Mitigation measures referenced programs by Banco Mundial, Banco Interamericano de Desarrollo, and Mexican social policy instruments.
The reservoir and surrounding landscape have been promoted for ecotourism inspired by destinations such as Cañón del Sumidero, Huatulco, Monte Albán, and Hierve el Agua, with activities organized by local tour operators and municipal authorities akin to those in Pochutla and Puerto Escondido. Recreational use includes boating, sport fishing, birdwatching linked to BirdLife International conservation routes, and cultural tourism emphasizing Day of the Dead and indigenous handicrafts marketed through networks like SECTUR and regional fairs comparable to the Guelaguetza. Infrastructure for visitors connects to hospitality businesses following standards from Secretaría de Turismo and training programs run by CANIRAC and local chambers of commerce.
Category:Dams in Mexico Category:Reservoirs in Oaxaca