Groundwater systems in the intermediate to deep subsurface of southern Ontario are poorly understood, despite their value for a number societal uses. A regional hydrostratigraphic framework is necessary precursor improving our understanding groundwater and enabling development 3-D model visualize these systems. This study compilation integration published unpublished geological, hydrogeological...

First posted March 19, 2021 For additional information, contact: Director, Maryland-Delaware-D.C. Water Science CenterU.S. Geological Survey5522 Research Park DriveCatonsville, MD 21228Contact Pubs Warehouse The U.S. Survey, in cooperation with the District Department of Energy & Environment, Quality Division, is investigating hydrogeology tidal Anacostia River watershed within Washington, D.C....

The concentrations of three frequently detected organochlorine pesticides (OCPs) and one degradation product, p,p'-DDT, p,p'-DDD, dieldrin, and p,p'-DDE were determined in recently collected (2005-2006) and archived (1986-1989) surficial sediments and sediment cores from Long Island Sound (LIS). The concentration of dieldrin ranged from 0.05 to 5.27 ng g(-1) dry weight in the surficial sediment...

The sandhill wetlands, ponds, and lakes of west-central Florida, USA, are an understudied, poorly understood variant geographically isolated features. Their karst origin xeric setting impart a characteristic ecohydrology, which has been attributed to their apparent connectivity regional water-supply aquifer. This study uses physical geochemical hydrologic data provide evidence this connectivity...

The nomenclature for Kansas aquifers needs revision. Many of the names currently in use were derived in an ad hoc manner without the benefit of a consistent set of hydrogeologically based guidelines. Because nomenclature forms the basis of scientific discussion of hydrologic issues, names should be clearly defined and consistently applied in order to prevent erroneous or unintended hydrologic i...

Wind-driven surficial oxygen transfer into stationary water bodies has become increasingly important because the fate of many pollutants in these water bodies is strongly influenced by oxygen mass transfer. There are many existing correlations that can be used for predicting wind-driven surficial oxygen transfer; however, the actual prediction has been difficult because there are large variatio...

A grid-oriented technique has been developed in order to build a 3D hydrostratigraphic model of the Quaternary sediments overlying a regional fractured rock aquifer, in the area of Châteauguay located south of Montreal, Quebec, Canada. It is part of the St-Lawrence Lowlands, a topographical lowland underlied by Paleozoic sedimentary rocks. It is based on the integration of the surficial sedimen...

Groundwater from a shallow freshwater lens on St. George Island, a barrier island located in the Panhandle of Florida, eventually discharges into Apalachicola Bay or the Gulf of Mexico. Nutrient concentrations in groundwaters were monitored downfield from three onsite sewage treatment and disposal systems (OSTDS) on the island. Estimates of natural groundwater nutrient concentrations were obtai...

Marine beach water quality is typically monitored in early morning once a week without respect to tidal condition. To assess the effect of tide on this public health warning system, we analyzed enterococci (ENT) data from 60 southern California marine beaches with differing geomorphology, orientation, and proximity to runoff sources. ENT concentrations during spring tides were significantly hig...