(A) All appropriate procedures must be utilized in the design of any storm water facility, as follows:
(1) Using a Type II rainfall distribution and North Royalton rainfall data;
(2) Using a runoff curve summary showing pre-development and post- development conditions;
(3) Using runoff calculations;
(4) Using travel time and time of concentration calculations;
(5) Using calculations on peak discharge and discharge volume;
(6) Using pre-hydrographs and post-hydrographs; or
(7) Using storage volume requirements.
(B) All storms must then be routed through the proposed drainage facility. SCS TR 20, or any other method approved by the City Engineer, may be used to perform this routing procedure.
(C) SCS emergency spillway design calculations must be submitted for a 100-year storm.
(D) Any additional information required by the City Engineer must be submitted at this time.
(E) All City Engineer’s outlet details must be used.
(F) The TR 55 computer programs may be utilized in this process.
(Ord. 1-91, passed 1-7-1991)