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<br /> <br />Adirondack Mountains, <br />New York <br /> <br /> <br />200 <br /> <br /><i <br />wOO <br />>-w <br />~~ 150 <br />wOO <br />"w <br />5~ <br />~>- <br />orE <br />>...J 100 <br />>-<< <br />z;;?: <br />;ta <br />"w <br />~:3 <br />z ~ 50 <br /><<z <br />:1- <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />o <br />o 5 10 15 20 25 <br />MEAN CONTACT TIME WITH SUBSURFACE MATERIALS, IN YEARS <br /> <br />Ffgure 5-2. The longer water is in contact with deep <br />subsurface materials in a watershed, the higher the alkalinity <br />in lakes receiving that water. (Modified from Wolock, D.M., <br />Hornberger, G.M.. Beven, K.J., and Campbell, W.G., 1989, <br />The relationship of catchment topography and soil hydraulic <br />characteristics to lake alkalinity in the northeastern United <br />States: Water Resources Research, v. 25, p. 829-837.) <br /> <br /> <br />Panther Lake in Adirondack Mountains, New York. <br />(Photograph by Douglas Burns.) <br /> <br />75 <br />