The system of storm sewers, inlets, and catch basins within a specific development area shall constitute a minor system. A major system shall include drainage systems, including the portion of a watershed that will become operative once the capacity of a minor system is exceeded. This includes streets or other depressed areas that will act as open channels and convey the excess storm water runoff to a natural drainage course or storage facility.
(A) The Commission shall not recommend for approval any subdivision plat which does not make adequate provisions for storm or flood water runoff channels or basins.
(B) The storm water drainage system shall be separate and independent of any sanitary sewer system.
(C) Storm sewers, where required, shall be designed by the Rational Method, or other methods as approved by the Commission and the County Drainage Board. A copy of the design computations shall be submitted along with the plans. (The rational method is described in Chapter Three of the County Storm Drainage Manual by Christopher B. Burke, Project for Indiana Counties and Cities, School of Civil Engineering, Purdue University, West Lafayette, May 1981, hereinafter referred to as the Drainage Manual).
(D) Inlets shall be provided so that surface water is not carried across or around any intersection, nor for a distance of more than 600 feet in the gutter or when the encroachment of storm water into the street disrupts traffic (Drainage Manual, p. 5-27).
(E) When calculations indicate that curb capacities are exceeded at a point, no further allowance shall be made for flow beyond that point, and catch basins or inlets shall be used to intercept flow at that point.
(F) Surface water drainage patterns shall be shown for each and every lot and block.
(Ord. passed - -)