Proposed withdrawal of groundwater from the surficial aquifer system confined zone, or the upper and lower Brunswick aquifers in eastern Camden County, Georgia, could result in drawdown extending beneath the Cumberland Sound and potentially could affect groundwater levels and natural resources at Cumberland Island National Seashore. Using a nonequilibrium formula, estimated drawdown after 5 yea...

A combination of geologic descriptions of cores, borehole geophysics, surfacegeophysical soundings and water-sample analyses was used to characterize flow in the surficial aquifer in the vicinity of Big Cypress National Preserve, Collier County, south Florida. The geophysical analysis augmented by aquifer tests and piezometer measurements showed that the surficial aquifer is under unconfined co...

A USGS investigation into the transport of contaminants to public-supply wells (PSWs) in four distinctly different aquifers demonstrates how differences in the chemistry of water produced by PSWs and nearby monitoring wells can reveal where and how contamination-susceptible water enters PSWs. This knowledge can be translated into improved monitoring strategies and protection plans. Samples were...

Hydrological Processes. 2017;1–19. Abstract This study analyzes a long‐term regional compilation of water table response to climate variability based on 124 long‐term groundwater wells distributed across New England, USA, screened in a variety of geologic materials. The New England region of the USA is located in a humid‐temperature climate underlain by low‐storage‐fractured metamorphic and cry...

Article history:Received 22 February 2009Accepted 10 September 2009Available online 17 September 2009 Editorial handling by D. Polya 0883-2927/$ see front matter 2009 Elsevier Ltd. Adoi:10.1016/j.apgeochem.2009.09.019* Corresponding author. Present address: EawagAquatic Science and Technology, UeberlandstrasseSwitzerland. Tel.: +41 (0) 44 823 50 01; fax: +41 (0)E...

Short-lived radium isotopes (223Ra and 224Ra) are used to investigate the potential association between groundwater discharge and microbial pollution at Huntington Beach, CA. We establish the tidally driven exchange of groundwater from the surficial beach aquifer across the beach face. Groundwater is found to be a source of nutrients (silica, inorganic nitrogen, and orthophosphate) to the surf ...

Groundwater sampling for monitoring the presence and concentration of contaminants can be done using either depth integrated monitoring wells (MW) or depth specific multi-level sampling (MLS) wells. Depth specific multi-level sampling wells (MLS) are cost-effective, easy to install, and provide very detailed information about the vertical gradient in contaminant concentration. In contrast the M...

The hydrogeological system of an ecologically sensitive alpine floodplain in the Valle di Blenio, Switzerland, was investigated using hydrochemical and 3H-3He dating methods. Water samples from six wells and from different surface locations were analyzed. The analysis of the concentrations of major ions in conjunction with age determination by the 3H-3He-method allowed the main hydrological pro...

First posted July 22, 2022 For additional information, contact: NAWQA Chief ScientistNational Water-Quality ProgramU.S. Geological Survey 12201 Sunrise Valley Drive, MS 413 Reston, VA 20192-0002 Groundwater provides nearly 50 percent of the Nation’s drinking water. To help protect this vital resource, U.S. (USGS) National Assessment (NAWQA) Project assesses groundwater quality in aquifers that ...

Surface discharges of anthropogenic nutrients historically have been the focus of Florida’s waterquality regulations. Groundwater contributions to eutrophication of Florida’s surface waters are a more recent focus. Florida’s naturally oligotrophic springs, streams, and lakes are experiencing significant anthropogenic nutrient contamination resulting from groundwater discharges with elevated nit...