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The upper aquifer near Dorado, Puerto Rico, is a major source of water for both public and private supply. The aquifer is composed of portions of the Aguada Limestone, Aymam6n Limestone, and adjacent permeable portions of unconsolidated deposits. As water moves through the aquifer it changes from a calcium-bicarbonate type water in the upgradient portions of the aquifer to a sodium-chloride type water in the downgradient portions of the aquifer near the coast. Pumping from the aquifer for industrial use and public supply has lowered the water table to near sea level in some areas, causing saline intrusion to be a concern. The saline-freshwater interface was located by drilling and borehole geophysics. Drilling and borehole geophysics helped locate the lower limit of the aquifer. The saline-freshwater interface is narrow close to the coast and thickens with distance from the coast. Ground-water hydrographs in the study area were simulated with a deterministic model that allows net recharge to be calculated from precipitation data and ground-water level data. Calculated net recharge rates ranged from 160 millimeters per year in 1995 at the Santa Rosa well site to 260 millimeters per year in 1996 at the Maguayo well site. INTRODUCTION The carbonate aquifer, in the Dorado area, just west of the San Juan area in north-central Puerto Rico, supplies water for domestic, commercial, and industrial uses. The development of ground-water supplies in this and other areas along the north-central coast of Puerto Rico is limited by saline-water intrusion. In 1991, the U.S. Geological Survey (USGS), in cooperation with the Puerto Rico Aqueduct and Sewer Authority (PRASA) began an investigation to study the hydrogeology and geochemistry of the aquifer in order to better understand the controls on saline intrusion in the area.

water-resources investigations report

Geochemistry and hydrogeologic framework of the saline-freshwater interface and the calculation of net recharge in the Dorado area, north-central Puerto Rico