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Policy 1,1: The @County hereby adopts the following level -of -service standard for all new drainage systems within the unincorporated eCounty: New development requiring major site plan approval or subdivision platting, where impervious area exceeds 5,000 square feet, shall construct a drainage system capable of mitigating the impacts of a 25 year/24 hour design rainfall event using the Natural Resource Conservation Service n r� Type 2 modified rainfall curves FLMOD , post deve epme^* runoff not exeeed pr -e development funeff tmiess a maximum disehar-ge rate has been adepted fer- the appli drainage basin and the discharge does not exceed that rate. if a Maximum disehar-ge rate has not been adepted for- the applicable basin, post develepmepA diseharge may not exceed pr -e developm fliseharge. In cases where downstream flooding has occurred the 100 year/24 hour design rainfall event shall be considered. Policy 1.2: , as designated on the most euffent Flood Insurance Rate Maps (FIRA4s) of the National Flood Insufanee Pfegr-a - "AE" zone structures must be eleva4ed a minimum of six ( 6) inches above the base flood level -,- "A" zone struetufes must be elevated a minimum of 18 inehes above the er-evm E)f the road or- at the must be elevated at least tbfee (3) feet above the highest nattir-al elevation of the ground sufface prior- te „str-uetie next to the ,.,.,,posed walls of the st fuetu fe ; - "VE" zone stfuetufes must be eleivated so that the bet4ena ef the lewest her-izental Stmetufal member of the lowest floor- is elevated one half (1,Q) feet er- Mere above the base flood level. All new buildings shall be above the 100 Year storm event along with any required appropriate freeboard protection. Elevations shall be defined by Flood Insurance Rate Maps, National Flood Insurance Program requirements, engineering studies and as defined in the County Stormwater Management and Flood Protection ordinance and codes. Policy 1.3: The c -County shall ensure that adequate storm water management facilities are constructed and maintained to prevent major flooding of the road network of Indian River County during storm events. Policy 1.5: All j bridges shall be de.,;,..,,ea to Mstan inn e f. 3 day st,,...,, event. At a 1111 major bridges minimum, all bridges either being reDlaced or reouirinQ structural designs for repairs shall be placed above the 100 -year flood elevation / FIRM / FIS elevation when located on an arterial roadway or thoroughfare plan road as defined in LDR 952.08 to allow for safe emergency passing. All other bridges shall be placed above the storm frequency and duration in accordance with FDOT Drainage Manual. All bridges shall be designed for hvdraulics, scour, and to be structurally in accordance with FDOT design manuals, index and specifications. [Best engineering practices] Policy 1.7: Within all new subdivisions, wide gppropriatel. s� backlot and front yard drainage easements, as well as side lot swales to provide for localized runoff routing, will be required where centralized retention/detention facilities are not provided. Objective 2: By 2020, all aauiuuse basins Indiaii D; of Go .t, sial, eA , i i","eet the Fleea nr„teetion Level f Sefviee (FP OS) for- ., 10 , eaf/ 4 t,ouf st,,,.,Y, e o„t Stormwater Management Facilities shall meet current or more stringent regulations as may be passed from time to time. C:\Users\ufc-prod\AppDataU"al\Temp\BCL Technologies\easyPDF 8\@BCL@6414E534\@BCL@6414E534.doex 34 40