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<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />pollutant loading of the Indian River Lagoon and receiving waters and provides proper floodplain management. an efficient <br />and effective stormwater management system which, to the maximum extent practical, provides proper floodplain <br />management; reduces risk of property damage and promotes personal safety; promotes stormwater recharge of the <br />shallow aquifer; minimizes erosion and water quality degradation; and reduces stormwater pollutant loading of the Indian <br />River Lagoon and receiving waters. <br />Objective 1: By 2030, all existing and new development in the unincorporated section of Indian River County will be <br />protected from flooding from a 25 year/24-hour storm event. To the maximum extent practical where attainable, by 2030, <br />the County shall actively manage a floodplain program to minimize flood risk for existing development within the <br />unincorporated section of Indian River County. New developments will continue to meet current or more stringent <br />regulations as may be passed from time to time. <br />Policy 1.1: The cCounty hereby adopts the following level-of-service standard for all new drainage systems within the <br />unincorporated cCounty: New development requiring major site plan approval or subdivision platting, where impervious <br />area exceeds 5,000 square feet, shall construct a drainage system capable of mitigating the impacts of a 25 year/24 hour <br />design rainfall event using the Natural Resource Conservation Service (NRCS) Type 2 modified rainfall curves (FLMOD). <br />Post development runoff shall not exceed pre-development runoff unless a maximum discharge rate has been adopted for <br />the applicable drainage basin and the discharge does not exceed that rate. If a maximum discharge rate has not been <br />adopted for the applicable basin, post development discharge may not exceed pre-development discharge. In cases <br />where downstream flooding has occurred the 100 year/24 hour design rainfall event shall be considered. <br />Policy 1.2: The finished floor elevation of any new building constructed within a SFHA}, as designated on the most <br />current Flood Insurance Rate Maps (FIRMs) of the National Flood Insurance Program (NFIP), shall be subject to the <br />following requirements: <br />~ "AE" zone - structures must be elevated a minimum of six ( 6) inches above the base flood level; "A" zone - <br />structures must be elevated a minimum of 18 inches above the crown of the road or at the elevation required by the <br />DHRS, whichever is higher; if no base flood data are available, the structure must be elevated at least three (3) feet above <br />the highest natural elevation or the ground surface prior to construction next to the proposed walls of the structure; <br />~ "VE" zone- structures must be elevated so that the bottom of the lowest horizontal structural member of the lowest <br />floor is elevated one-half (1/2) foot or more above the base flood level. <br />PAGE 58