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ORDINANCE 2012-036 five-year, twenty -four-hour (25/24) and one hundred -year, three-day storm (100/72) events, or as otherwise directed by the governing water body agency. 10. All proposed culverts or structures within all F.S. Chapter 298 Water Control Districts' rights-of-way or easements shall be approved by the applicable water control district or shall be designed according to the water control districts' published requirements prior to issuance of a stormwater management system permit. 11. In all subdivisions not having a centralized stormwater management system, all side lot and rear lot drainage swal_es shall be a minimum total of twenty (20) feet wide, ten (10) feet on each side of side lot lines. The approval of this type of system is at the discretion of the county public works director and shall erAy be considered only along the crest of the one -mile Atlantic coastal ridge or barrier island where excessive soil permeability exists. 12. New subdivisions located in flood hazard areas or with lots smaller than sixty-five thousand (65,000) square feet, shall not use front, rear or side lot swales as a method for stormwater runoff treatment, except as provided for below. Swales for runoff transference (conveyance) are allowed and shall be designed to maintain a minimum elevation above the twenty -five- year, twenty -four-hour storm event (one (1) foot above twenty -five-year, twenty -four-hour storm is recommended) and contain positive flow (minimum slope of three -tenths (0.3) percent). At the discretion of the public works director, subdivisions not located in a special flood hazard area and having lots less than sixty-five thousand (65,000) square feet in size, are mawobtain a waiver from these swale prohibitions and restrictions, in part or whole, based on site and soil conditions. Waivers will be limited to sites located on the barrier island and the Atlantic coastal ridge running just west of U.S. Highway 1. 13. All new developments located in the shallow aquifer recharge areas identified in Figure 3.D.2 of the natural groundwater aquifer recharge sub element of the county's comprehensive plan shall retain the increase in run-off volume resulting from a twenty -five-year, twenty -four-hour storm event. 14. All slopes greater than six (6) horizontal to one (1) vertical shall be sodded. Flatter slopes, depending on site-specific design, may also be required to be sodded as part of the stormwater management system permit. The public works director, through the county stormwater permit process, may require sodding of flatter slopes if warranted by site or Underline: Additions to Ordinance Deleted Text from Existing Ordinance 20 C:\Documents and Settings\tlister\Desktop\Revised IRC Flood Protect Ord final 10-26-12.rtf