"Rational method" means the method of computing storm drainage flow rates (Q) by use of the formula Q = CIA, in which C is a coefficient describing the storm water runoff characteristics of the site, I is the rainfall intensity, and A is the catchment area tributary to the point being studied.

This definition applies only to "Drainage" regulations in chapter 30.63A SCC. (Added by Amended Ord. 02-064, Dec. 9, 2002, Eff date Feb. 1, 2003).