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All new buildings shall be above the 100 Year storm event along with any required appropriate freeboard protection. Elevations shall be as 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 cCounty 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 major bridges shall be designed to withstand a 100 year/3-day storm event. At a minimum, all bridges either being replaced or requiring 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 hydraulics / scour / structurally in accordance with FDOT design manuals, index and specifications. Policy 1.7: Within all new subdivisions, wide appropriately sized 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 drainage basins in Indian River County shall, at a minimum, meet the Flood Protection Level of Service (FPLOS) for a 10 year/24-hour storm event. Stormwater Management Facilities shall meet current or more stringent regulations as may be passed from time to time. Policy 2.1: In existing developments, the county shall reconstruct existing drainage systems and restore design capacity when road paving is programmed under the county's Petition Paving Program. Under the County's Petition Paving Program, Stormwater Management Systems associated with the road shall be repaired, reconstructed, or rehabilitated to meet LDR stormwater management facility design criteria. Policy 2.2: By 20202040, to the maximum extent practical, all existing reconstructed roadways in the cCounty shall be improved to meet the following level-of-service standard: 1. Minimum road crown elevation for existing roads shall be raised during resurfacing/rebuilding to the flood elevation resulting from the 2 year/24 hour storm event on local streets. 2. The center two lanes of rebuilt roads shall be at or above flood levels resulting from a 10 year/24-hour storm event on Arterial and , Collector and Thoroughfare Plan roads as defined by Land Development Regulations Chapter 952 – Traffic. PAGE 59