“…Geographers and hydrologists have utilized several methods to produce runoffdepth contour maps (Langbein, et al, 1949, Thornthwaite, et al, 1958, Solomon, et al, 1968, Liebscher, 1972, Foyster, 1975, Krug, et al, 1990 but the predominate method of mapping runoff is with manual methods (e.g. Krug, et al, 1990).…”