Charles S. Slichter (original) (raw)

Charles Sumner Slichter (April 16, 1864 – October 4, 1946) was an applied mathematician and dean of the graduate school at the University of Wisconsin-Madison. His most notable scholarly contribution focused on hydrogeology, where he developed a method of quantifying the velocity of ground-water underflow in river valleys. This method employed ammonium chloride that would be placed in an upstream, i.e., the upgradient, well and detected in three observation wells a short distance away, i.e., the downgradient.