(A) Adequate surface and subsurface drainage ways for the removal of storm water shall be provided by the subdivider. The extent to which storm drainage facilities shall be required shall be based upon an analysis of need prepared for the subdivider by a registered professional engineer and/or registered land surveyor. The computations shall show that the peak runoff rate after development for the 100-year return period storm of 24-hour duration shall not exceed the 10-year return period pre-development peak runoff rate. Times of concentration, soil infiltration rates, and other variable factors to be used in the analysis shall be discussed with and approved by the County Surveyor during the preliminary consideration of the subdivision. The engineer (or his agent) preparing the analysis shall provide the City Surveyor with a copy of the computations used in the completion of the analysis.
(B) A storm water sewer system, which shall be separate and independent of the sanitary sewer system, with surface inlets, shall be provided by the subdivider in all cases where curb and gutter is to be installed and whenever the available evidence indicates that such a system is necessary due to the inadequacy of the natural surface drainage.
(C) Any person proposing to locate a structure or a use within 100 feet of any stream or main drainage channel in any zoning district shall include with the application for an improvement location permit and/or a certificate of occupancy, a statement from the Indiana Department of Environmental Management, based on a study of the watershed area and the probably runoff, that the structure or use in the proposed location will leave adequate space for the flow of flood water, provided, however, that no building shall be permitted within 75 feet of the top of the bank of any stream or main drainage channel unless permitted by the County Drainage Board.
(D) The subdivider shall furnish the Commission a complete set of plans and profiles as approved by the various authorities.
(E) All plans and workmanship shall be in compliance with the Indiana Drainage Code, I.C. 36-9-27 and all acts supplemental and amendatory to it.
(Ord. 466, § 4-8-8, passed 5-11-98) Penalty, see § 151.999