A "spring" is a defined point at which groundwater reaches the surface (a spring seepage is less easily localized or defined). The "spring run" is a defined flowing channel (these can be braided) fed by the spring. Usually they are short and join other spring runs, a stream, a spring pond, or a spring lake. T otal alkalinity is <50 ppm. Alkalinity can play a role in determining invertebrate composition of a site (e.g., those that make shells are mostly associated with "hard" water springs).
