Groundwater Sustainability of the Long Island Aquifer System

Map of Long Island

    A network of Lloyd and Magothy groundwater wells will be installed at about 30 locations throughout the Island to fill in substantial data gaps. The existing groundwater well network consists mostly of shallow and deep wells in Nassau County, some wells in Suffolk Counties, and some shallow wells in Kings and Queens Counties. The locations of the proposed groundwater wells will be selected by reviewing geologic, hydrologic, and water-quality, information from the existing network. Geologic information obtained from newly installed groundwater wells will be used to improve existing maps (Smolensky and others, 1990) of Long Islandís geology, and included in newly developed groundwater models.

Collecting Borehole Geophysical Logs

Collecting Borehole Geophysical Logs

Hydrogeologic Framework of the Long Island Aquifer System

Hydrogeologic Framework of the Long Island Aquifer System













    During and after completion of the newly drilled wells, rock and sand core samples will be collected and analyzed to improve the understanding of Long Islandís geology. Core samples will be analyzed at specific depths in wells to determine the presence of saline groundwater. Continuous geologic and water-quality information will also be collected using geophysical methods along each wellís depth.

Typical Drill Rig

Typical Drill Rig

Drilling Sites

Drilling Sites













    Land-based and waterborne geophysical surveys will be used to map geologic features including aquifers and confining units. Results from these surveys will help guide site selection for new groundwater wells and fill data gaps where drilling new wells may not be feasible.

Land Based Geophysics

Land Based Geophysics

Waterborne Geophysics

Waterborne Geophysics

Electromagnetic Survey

Electromagnetic Survey