An assessment of ground-water withdrawals at municipal industrial parks throughout Puerto Rico was conducted to investigate the effect of ground-water usage on nearby surface- and ground-water resources. Water-bearing strata were divided into four generalized hydrogeologic units: (1) fissured aquifers (including karst and non-karst limestone); (2) intergranular aquifers; (3) intergranular aquifers overlying fissured rock units; and (4) strata with local or limited ground-water resources. Approximately 49 percent of the municipal industrial parks are located in areas with local or limited ground-water resources, 29 percent overlie intergranular aquifers, 13 percent overlie fissured aquifers, and 9 percent overlie intergranular units that overlie fissured rock units.
Hydrogeologic data for the generalized hydrogeologic units were compiled from published U.S. Geological Survey reports. Depths to ground water near industrial parks range from approximately 20 to 400 feet in the fissured aquifers, 6 to 65 feet in coastal intergranular aquifers, 3 to 30 feet in intergranular aquifers overlying fissured rock units, and 1 to 100 feet in strata with local or limited ground-water resources. Aquifer transmissivities near industrial parks range from approximately 100,000 feet squared per day in the fissured aquifers to less than 100 feet squared per day in the strata with local or limited ground-water resources.
Well construction data were compiled from published U.S. Geological Survey reports, drillers’ logs, and unpublished reports. Specific capacity for wells near industrial parks ranges from approximately 100 gallons per minute per foot of drawdown in the fissured aquifer at Manatí to approximately 0.1 gallon per minute per foot of drawdown in strata with local and limited ground-water resources at Bayamón. Reported well yields near industrial parks ranges from 2,800 gallons per minute in the intergranular aquifer at Santa Isabel to approximately 3 gallons per minute in strata with local and limited ground-water resources at Adjuntas.
Historical ground-water-level data
from U.S. Geological Survey observation wells were used to define ground-water
levels trends in the vicinity of industrial
parks. Areas showing ground-water level declines, and therefore possible aquifer
over-development, are located in Barceloneta and Guayama. Rising ground-water
levels were noted in the vicinity of industrial parks at Florida, Ponce, and
Yauco.
Ground-water withdrawal data were compiled from site visits to the industrial
facilities and from information provided by Puerto Rico Department of Natural
and Environmental Resources. Total ground-water withdrawal at the municipal
industrial parks was estimated to be 1.6 million gallons per day. Most withdrawals
were from intergranular coastal aquifers, which accounted for about two thirds
of the ground-water withdrawals. Municipal industrial parks with substantial
ground-water withdrawals are located in Bayamón, Caguas, Humacao, and
Ponce.
Abstract
Introduction
Methods
Aquifer units
Site visits
Hydrogeologic characteristics
Well characteristics
Ground-water availability
Hydrogeologic characteristics of aquifers underlying industrial parks
Fissured aquifers (non-intergranular)
Intergranular aquifers
Eastern Puerto Rico
Western Puerto Rico
Southern Puerto Rico
Interior Puerto Rico
Island municipios
Intergranular unit overlying fissured rock unit
North Coast
South Coast
Southwest Puerto Rico
Strata with limited and local ground-water resources
Well characteristics
Potential effects of industrial ground-water withdrawals on availability
of surface- and
ground-water resources
Summary
References Cited
The citation for this report, in USGS format, is as follows:
Rodríguez, J.M., 2004, Assessment of Ground-Water Withdrawals at Municipal Industrial Parks in Puerto Rico, 2000: U.S. Geological Survey Scientific Investigations Report 2004-5029, 73 p.
Download the Report (PDF, 4.0 MB).
Please visit http://pr.water.usgs.gov/ for more information about USGS activities in the Caribbean (Puerto Rico and the U.S. Virgin Islands).
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