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| Hydrology of Puerto Rico | |
|---|---|
| Name | Hydrology of Puerto Rico |
| Caption | Río Grande de Loíza watershed |
| Location | Puerto Rico |
| Rivers | Río de la Plata (Puerto Rico), Río Grande de Loíza, Río Bayamón, Río Piedras (Puerto Rico), Río Guajataca |
| Aquifers | Aguada Limestone, Northern Karst Aquifer, Arecibo Limestone |
| Precipitation | Tropical rainforest, orographic enhancement from Cordillera Central (Puerto Rico) |
| Hazards | Hurricane María (2017), Hurricane Georges, 2017 Puerto Rico blackout |
Hydrology of Puerto Rico
Puerto Rico's hydrology is shaped by its position in the northeastern Caribbean, the influence of the Atlantic Ocean, the Caribbean Sea, and the island's central highlands, producing complex interactions among Río Grande de Loíza, Río de la Plata (Puerto Rico), karst aquifers, and coastal systems under pressures from Hurricane María (2017), urbanization in San Juan, Puerto Rico, and infrastructure managed by entities such as the Puerto Rico Aqueduct and Sewer Authority and the United States Geological Survey. Research institutions including the University of Puerto Rico, Río Piedras Campus, the NOAA Atlantic Oceanographic and Meteorological Laboratory, and the US Army Corps of Engineers have documented river discharge, groundwater recharge, and watershed responses to land‑use change, while federal frameworks like the Clean Water Act and programs like FEMA flood mitigation influence policy.
Puerto Rico's island physiography is dominated by the Cordillera Central (Puerto Rico), the Sierra de Luquillo, and the Northern Karst Province (Puerto Rico), which control orographic precipitation and drainage to coastal plains including San Juan Bay and Mayagüez Bay; major administrative divisions such as Arecibo, Puerto Rico, Ponce, Puerto Rico, Aguadilla, Puerto Rico, and Fajardo, Puerto Rico define watershed governance. Geologic formations from Paleozoic to Quaternary strata including the Arecibo Limestone and volcanic rocks underlie aquifer systems studied by the Puerto Rico Water Resources Authority and academic programs at the University of Puerto Rico, Mayagüez Campus and University of Puerto Rico at Aguadilla.
Precipitation is modulated by the North Atlantic Oscillation, the Intertropical Convergence Zone, and tropical cyclones such as Hurricane Georges and Hurricane María (2017), producing spatial gradients from wet sites in the Sierra de Luquillo near El Yunque National Forest to drier leeward zones around Ponce, Puerto Rico and Guánica Dry Forest; agencies like NOAA and NASA monitor rainfall, while studies by USGS and the University of Puerto Rico use rain gauges, radar, and satellite products such as TRMM and GPM.
Rivers including the Río Grande de Loíza, Río de la Plata (Puerto Rico), Río Bayamón, Río Piedras (Puerto Rico), and Río Guajataca drain distinct watersheds into the Atlantic Ocean and Caribbean Sea; hydrologic routing, sediment transport, and channel morphology have been analyzed by USGS, the Army Corps of Engineers, and researchers at the University of Puerto Rico, Río Piedras Campus. Watershed management intersects with municipalities such as Caguas, Puerto Rico, Arecibo, Puerto Rico, and Carolina, Puerto Rico and is affected by infrastructure including reservoirs like Carraízo Reservoir and flood control projects evaluated under FEMA hazard maps.
Karst aquifers in the Northern Karst Province (Puerto Rico), carbonate units such as the Aguada Limestone, and fractured volcanic aquifers in the Cordillera Central (Puerto Rico) provide potable supply for municipalities including San Juan, Puerto Rico and Mayagüez, Puerto Rico; hydrogeologic mapping by USGS and the Puerto Rico Aqueduct and Sewer Authority documents recharge zones, transmissivity, and issues linked to saltwater intrusion near coastal towns like Dorado, Puerto Rico and Isabela, Puerto Rico. Groundwater studies often involve collaboration with the U.S. Geological Survey Caribbean Water Science Center and the University of Puerto Rico, Mayagüez Campus.
Water quality challenges arise from urban runoff in San Juan, Puerto Rico, industrial discharges near Bayamón, Puerto Rico, agricultural inputs in the Ponce, Puerto Rico region, and legacy contaminants from sites overseen by the Environmental Protection Agency; studies report nutrients, fecal bacteria, heavy metals, and pesticides impacting rivers such as the Río Grande de Loíza and coastal embayments near La Parguera. Monitoring networks by USGS, EPA, and academic groups at the University of Puerto Rico, Río Piedras Campus assess compliance with the Safe Drinking Water Act and support remediation tied to programs like Superfund when applicable.
Water supply and distribution are administered primarily by the Puerto Rico Aqueduct and Sewer Authority with policy and emergency response involving FEMA, the Commonwealth of Puerto Rico, and federal agencies including EPA and USGS; major water uses include municipal supply to San Juan, Puerto Rico, irrigation in Ponce, Puerto Rico, and industrial uses in Arecibo, Puerto Rico. Infrastructure vulnerability highlighted after Hurricane María (2017) spurred investments evaluated by the US Army Corps of Engineers and planning by the Puerto Rico Planning Board and the Governor of Puerto Rico.
Hydrological hazards stem from tropical cyclones such as Hurricane Georges, Hurricane María (2017), and episodic torrential storms influenced by the El Niño–Southern Oscillation; major flooding in watersheds like the Río Grande de Loíza has driven floodplain mapping by FEMA and channel studies by USACE. Drought episodes affecting southern municipalities including Guánica, Puerto Rico and Ponce, Puerto Rico prompt declarations involving the Governor of Puerto Rico and emergency measures coordinated with NOAA drought outlooks.
Hydrological research is conducted by institutions including the U.S. Geological Survey Caribbean Water Science Center, the University of Puerto Rico, Mayagüez Campus, NOAA Atlantic Oceanographic and Meteorological Laboratory, and international partners such as NASA and the Pan American Health Organization; monitoring networks employ streamgages, groundwater wells, and remote sensing from Landsat and Sentinel-2 platforms. Policy instruments shaped by the Clean Water Act, the Safe Drinking Water Act, FEMA flood programs, and initiatives enacted by the Puerto Rico Aqueduct and Sewer Authority and the Puerto Rico Planning Board guide adaptation, resilience, and research priorities for water resources on the island.
Category:Water in Puerto Rico