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- W46429402 abstract "Well-water quality depends on the relative amounts of water drawn from different hydrologic units, and the particular capture zones within those units. A contaminant spilled within an aquifer capture zone will eventually enter the well. A spill outside the capture zone may eventually discharge elsewhere, perhaps to a nearby stream. If under normal circumstances the stream is gaining, pumping can locally reverse gradients, causing it to become losing. Stream water can then enter the well by induced infiltration. For wells located near surface water bodies, a variety of two- and three-dimensional analytical and numerical models of induced infiltration and capture zones are presented. Induced infiltration does not seem to be very sensitive to the ambient flow source, whether it's local vertical recharge or lateral inflow. Two types of capture zones are defined: ultimate capture zone that include portion of the aquifer that will eventually discharge to the well, and time-dependent capture zones that include only that portion of the aquifer that discharges to the well within a prescribed time. Capture zones are strongly influenced by the source and direction of ambient aquifer flow, nearby aquifer boundaries, and three-dimensional flows caused by partial penetration of the well or the stream. Capturemore » zone models involve uncertain parameters that lead to 'fuzzy' capture zone boundaries. Hydrodynamic and macro dispersion are other sources of uncertainty. They allow a particle to wander across the capture zone boundary. Thus a source of contamination outside of the capture zone has a finite probability of being incorporated into the well water. Another interpretation of these probabilities, at least for long-term continuous sources of contamination, is that they define the proportion of the contaminant that will eventually find its way to the well.« less" @default.
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- W46429402 date "1991-11-01" @default.
- W46429402 modified "2023-09-24" @default.
- W46429402 title "Ground-water quality in pumping wells located near surface-water bodies. Technical completion report" @default.
- W46429402 hasPublicationYear "1991" @default.
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