Abstract

ABSTRACTPumping from a dolomite aquifer adjacent to Lake Michigan has reversed the natural hydraulic gradient so that lake water has been induced to flow into the aquifer. Because lake water is muchlower in dissolved solids than the ambient ground water, the induced recharge is traceable as adistinct plume of high‐quality water over a mile long. The configuration of the plume allows interpretation of the hydraulic connection between the lake and the aquifer. Most of the induced recharge enters the aquifer through the lake bed at locations where the most permeable parts ofthe aquifer are overlain by relatively thin lake‐bed sediments which, in turn, are at least partly sand and gravel. It continues inland along zones of high hydraulic conductivity.

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