Has* trow N*w York State Department ol Iransportaiion, o Amityviite, t f»«port, Hicksvttle. Huntington MILE ?4 ooo 40 .5 1 KtLOMtTER EXPLANATION LINE OF EQUAL THICKNESS-Shows saturated thickness of upper glacial aquifer. Contour Interval 20 feet. 600 LINE OF EQUAL THICKNESS-Shows saturated thickness of combined upper glacial, magothy aquifers. Contour interval 100 feet. Figure 4-Approximate saturated thickness of upper glacial aquifer and of combined upper glacial and Magothy aquifers.
Particle tracking was applied to a three-dimensional, seven-layer groundwater flow model of a 270-square-mile area in central Long Island to delineate the recharge-contributing areas to five hypothetical well sites that represent a variety of hydrologic settings. These sites are (1) on the northern shore, (2) near the regional groundwater divide where a confining layer is present, (3) near the regional groundwater divide where no confining layer is present, (4) at the southern shore near the Patchogue River where a confining unit is present, and (5) at the southern shore near a tidal wetland where no confining unit is present. Groundwater flow at each site was simulated (1) under nonpumping conditions, and (2) at two pumping rates 36,000 and 72,000 cubic feet per day. The model was calibrated to long-term, steady-state conditions and coupled to a previously developed Long Island regional model to obtain boundary flows and to define regional-scale system geometry. The study-area model has finer discretization than the regional model and can provide detailed flow-path resolution in the well-site areas. Particletracking analyses showed that the size and shape of the contributing areas to wells and the directions of groundwater flow can be significantly affected by (1) the presence or absence of a confining unit; (2) proximity to flow boundaries, such as streams, the shore, the saltwater-freshwater interface, and public-supply wells; and (3) pumping rates.
A study of ground-water levels and flow in east-central Nassau County, N.Y., began in October 1985. The 11.4 square-mile area encompasses parts of Bethpage,
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