A Method of Determining Storm-Water Run-Off

The rational method of determining storm-water run-off, as introduced by Emil Kuichling, M. Am. Soc. C. E., and modified in various particulars by designers in the United States and abroad, has usually given satisfactory results. It is not very widely used, however, and the formula methods, of which the Bürkli-Ziegler and the McMath are the most popular, are most generally used, in spite of the common realization of the fact that the results given by them lack consistency, and are very erratic and unreliable, The popularity of these insufficient formulas, notwithstanding their drawbacks, indicates that a formula which will give results reasonably close to those obtained by the rational method will be acceptable for service, even though of somewhat complicated form.