Ground-water resources of the Caguas-Juncos Valley, Puerto Rico
Water-Resources Investigations Report
91-4079
By: J. C. Puig and J. M. Rodriguez
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Abstract
?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.
Suggested Citation
Puig, J.C., Rodriguez, J.M., 1993, Ground-water resources of the Caguas-Juncos Valley, Puerto Rico: U.S. Geological Survey Water-Resources Investigations Report 91-4079, v, 52 p., https://doi.org/10.3133/wri914079.
Study Area
| 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 |