Ground-water resources of the Caguas-Juncos Valley, Puerto Rico

Water-Resources Investigations Report 91-4079
By:  and 



?The Caguas-Juncos valley, which occupies an area of 35 square miles in east-central Puerto Rico, is underlain by the largely unconfined alluvial aquifer. Withdrawals from this aquifer for public water supply and for agricultural, industrial, and domestic water uses totalled about 3.0 million gallons per day in 1988. Some wells in the valley yield as much as 310 gallons per minute from the alluvial deposits along Rio Gurabo near Gurabo and near Juncos. Wells used at dairy farms in the area commonly yield about 30 gallons per minute. The potentiometric surface of the alluvial aquifer varies seasonally and generally is highest near the end of December and lowest in April. Transmissivity of the alluvial aquifer, estimated from specific capacity and slug test data, ranges from 65 to 4,800 feet squared per day. The estimated specific yield of the water-table is about 10 to 15 percent. The amount of water stored in the aquifer is estimated to be about 122,000 acre-feet. Analyses of ground-water samples revealed the presence of two distinct problems-- high natural concentrations of iron and manganese, and localized areas of human- related contamination scattered throughout the valley. The ground water is a calcium-bicarbonate type and typically has dissolved solids concentrations of less than 500 milligrams per liter.

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Publication type Report
Publication Subtype USGS Numbered Series
Title Ground-water resources of the Caguas-Juncos Valley, Puerto Rico
Series title Water-Resources Investigations Report
Series number 91-4079
DOI 10.3133/wri914079
Year Published 1993
Language English
Publisher U.S. Geological Survey
Description v, 52 p.
Country United States
State Puerto Rico
Other Geospatial Caguas-Juncos Valley
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