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| Laguna de Aculeo | |
|---|---|
| Name | Laguna de Aculeo |
| Location | Melipilla Province, Santiago Metropolitan Region, Chile |
| Type | endorheic |
| Inflow | Aconcagua River tributaries, groundwater |
| Outflow | none |
| Catchment | Maipo River basin (adjacent) |
| Basin countries | Chile |
Laguna de Aculeo was a shallow seasonal saline lake in the Melipilla Province of the Santiago Metropolitan Region of Chile, historically noted for recreational boating, birdlife, and regional cultural importance. Located southwest of Santiago, Chile and near the city of Santiago, the lake's fluctuations and eventual drying attracted attention from hydrologists, conservationists, agribusiness stakeholders, and municipal authorities. Debates over water rights, land use, and restoration brought into play institutions such as the Dirección General de Aguas (Chile), the regional government of Santiago Metropolitan Region, and national environmental agencies.
The lake occupied a shallow closed basin in a Mediterranean-climate valley bordered by hills associated with the Cordillera de la Costa (Chile) foothills and the Central Valley (Chile). Hydrologically, its regime was controlled by seasonal precipitation from systems linked to the South Pacific High and episodic fronts tied to the El Niño–Southern Oscillation. Surface inflow derived from small tributary streams and overland runoff from surrounding catchments influenced by irrigated agriculture around Melipilla, while subsurface recharge connected to local aquifers managed under rules of the Dirección General de Aguas (Chile). Historically, variability in the Maipo River basin and regional groundwater pumping altered the lake’s water balance, with climatic drivers such as multidecadal droughts documented in Chilean hydrological studies.
The basin hosted pre-Columbian settlements linked to indigenous groups of the central Chilean valleys, later becoming a locus for colonial-era estancias and rural communities attested in archival records of Captaincy General of Chile administration. In the 19th and 20th centuries the lake became associated with leisure culture among elites from Santiago, Chile and provincial towns, paralleling development in nearby resort localities and transport links such as roads toward Melipilla. Cultural references appeared in regional literature and press, and the lake served as a setting for traditional festivals, fishing customs, and seasonal gatherings tied to patronal celebrations of local municipalities.
Beginning in the early 21st century, a combination of prolonged drought associated with a strong negative phase of the Pacific Decadal Oscillation and intensified groundwater extraction for irrigation by agribusiness and vineyards contributed to a persistent negative water balance. Regulatory decisions concerning wells registered with the Dirección General de Aguas (Chile) and judicial disputes over consumptive water rights intensified public scrutiny. By the late 2010s the lake experienced dramatic shrinkage and in 2018–2020 a near-complete desiccation event captured national media attention, provoking comparisons to other Chilean water crises such as conflicts in the Atacama Region. Scientific assessments by university researchers from institutions like the University of Chile and the Pontifical Catholic University of Chile documented changes in groundwater levels, evapotranspiration rates, and land-use intensification.
Responses combined municipal, regional, and national measures: emergency ordinances by the Municipality of Paine and neighboring communes, proposals to regulate abstraction under the Código de Aguas (Chile), and calls for managed aquifer recharge projects championed by academics from Universidad de Santiago de Chile. Civil society actors, including local environmental groups and agrarian associations, advocated competing programs such as watershed reforestation, irrigation modernization with techniques endorsed by the Instituto de Investigaciones Agropecuarias (INIA), and legal reforms to strengthen the Dirección General de Aguas (Chile). Pilot restoration efforts explored artificial recharge, reconnection of ephemeral inflows, and incentives to retire high-consumption wells, with monitoring by regional environmental services.
The basin supported wetland and steppe assemblages used by migratory and resident birds, historically attracting species recorded in regional checklists compiled by naturalists and ornithological societies. Aquatic vegetation and ephemeral marshes hosted amphibian and invertebrate communities once typical of central Chilean wetlands. Loss of surface water led to habitat fragmentation impacting assemblages of waterfowl and shorebirds documented by researchers at the Chilean Birdlife Network and university field stations. Conservationists cited parallels with wetland declines elsewhere in Chile, invoking instruments from international frameworks referenced by Chilean agencies.
For decades the lake was a local attraction for boating, windsurfing, and weekend tourism from Santiago, Chile and nearby urban centers such as Melipilla. Recreational infrastructure included rural lodging, seasonal food vendors, and access roads linked to provincial routes. The drying episode disrupted livelihoods tied to tourism and spurred grassroots campaigns to restore the lake as a destination, while regional planners considered diversifying rural economies toward agrotourism and nature-based services promoted by municipal tourism offices.
At the center of disputes were water rights adjudications under the Código de Aguas (Chile), contested registrations before the Dirección General de Aguas (Chile), civic lawsuits, and municipal zoning decisions. Political actors from the Santiago Metropolitan Region debated legislative reforms to prioritise environmental flows and to revise permit regimes, echoing broader national controversies over water privatization and reform proposals presented in the Chilean Congress. The case of the lake became emblematic in media and policy debates about sustainable resource governance, intersecting with court cases and administrative reviews concerning aquifer management.
Category:Lakes of Santiago Metropolitan Region Category:Wetlands of Chile