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Filters Date Range Past year (2) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions (Less) Shapefile (2) Types (Less) Downloadable (2) OGC WFS Layer (2) OGC WMS Layer (2) Shapefile (2) Contacts (Less) Frederick Stumm New York Water Science Center Cooperative Water Program Anthony Chu NYC Department of Environmental Protection Suffolk County Water Authority Categories (Less) Data (2) Project (2) Tags (with Type=Label and Scheme=(none)) geophysics (4) borehole (2) groundwater (2) gw or sw (2) hydrogeologic characterization (2) borehole geophysics (1) completed (1) freshwater (1) groundwater and streamflow information (1) groundwater monitoring (1) groundwater-flow modeling (1) rock fractures (1) saltwater (1) tunnels (1) water use and availability science (1) wells (1) View Results as: JSON ATOM CSV

Delineation of Rock Fractures, Faults, and Groundwater Flow in the Vicinity of Proposed Water Tunnels, New York City and Southeastern New York Problem - The New York City Department of Environmental Protection (NYCDEP) is constructing or proposing water tunnels under New York City and areas of southeastern New York (Hudson River Basin). These tunnels can intersect faults and fractures that produce large amounts of ground water. For example, one tunnel excavation intersected fractures that produced over 200 gallons per minute of ground-water flow into the tunnel. Consequently, there is a need to determine the potential of intersecting ground-water producing fractures during tunnel excavation. The use of advanced borehole geophysical techniques by the USGS during tunnel excavations in northern Queens County demonstrated that geophysical techniques can... Categories: Data, Project; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Borehole Geophysics, Completed, Cooperative Water Program, GW or SW, GW or SW, All tags... GW or SW, Geophysics, Geophysics, Geophysics, Groundwater Monitoring, Groundwater Monitoring, Groundwater Monitoring, Groundwater and Streamflow Information, Groundwater and Streamflow Information, Groundwater-Flow Modeling, Groundwater-Flow Modeling, Groundwater-Flow Modeling, Hydrogeologic Characterization, Hydrogeologic Characterization, Hydrogeologic Characterization, New York, New York City, USGS New York Water Science Center, WSC, Water Use and Availability Science, Water Use and Availability Science, borehole, groundwater, rock fractures, tunnels, Fewer tags Delineation of the Freshwater-Saltwater Interface at Selected Public-Supply Wells Using Advanced Surface and Borehole Geophysical Techniques, in Eastern Suffolk County, New York The combination of a complex hydrogeologic framework, narrow land masses surrounded by saltwater, and extensive ground-water public-supply pumpage has produced localized areas of elevated chloride concentrations in ground water. This project uses advanced surface and borehole geophysical methods to determine the extent of saltwater intrusion and road-salt plumes at selected sites in eastern Suffolk County, Long Island, NY. Two-dimensional resistivity sections have been integrated with borehole geophysical logs and water-quality data to produce cross-sections of road-salt plumes. Borehole geophysical logs are collected twice a year to determine variations in chloride concentration and thicknesses of intrusive... Categories: Data, Project; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Borehole Geophysics, Borehole Geophysics, Borehole Geophysics, Cooperative Water Program, GW or SW, All tags... GW or SW, GW or SW, Geophysics, Geophysics, Hydrogeologic Characterization, Hydrogeologic Characterization, Hydrogeologic Characterization, New York, Suffolk County, USGS New York Water Science Center, WSC, borehole, freshwater, geophysics, groundwater, saltwater, wells, Fewer tags