Hydrogeologic tracing is an intuitive characterization technique that has been applied for a surprisingly long period of time: there are records of chaff being used as a tracer near the Jordan River in approximately 10 A.D., and quantitative experiments using salts and fluorescent dyes were first used in Europe in the late 1800s (see Käss, 1998, Chapter 1). By far, most historical applications of tracers were designed to delineate flow paths and determine transport times in karst systems; however, during the past couple of decades, the discipline of tracer hydrogeology has blossomed with an amazing diversity of applications. Tracers...

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