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ATTY/ORD.465/RC ORD – ZONING MIXED USE WATERFRONT DISTRICT <br />REV: 05-02-18 PR <br />Page 16 of 16 <br />57.10 Measures Addressing Sea Level Rise The Mixed Use Waterfront Zoning District provides for an adaptation approach to sea level rise. Strategies to accommodate sea level rise shall be approved by the appropriate review authority, but shall meet the goal of accommodating an increase in sea level of 3 feet by 2100. Methods for achieving long-term flood hazard reduction include, but are not limited to, any combination of the following approaches and shall be approved by the City Engineer: A. Elevation of Lowest Floor. The lowest floor of structures shall be built at or above the existing 100-year base flood elevation plus 3 feet of sea level rise. Elevation change from any future development to the waterfront should be accommodated through graded slopes and low retaining walls, as needed. This increased elevation shall not be required for structures wholly within a FEMA-accredited levee or seawall system. B. Setbacks. Required setbacks from waterfront areas, as described in Table 57.4 (Development Standards), shall not only provide for public access and recreation but provide additional buffer to accommodate sea level rise. C. Managed Retreat. Projects shall provide for a phased conversion of the outboard portions of any project area to tidal marsh. When the outboard edge of the fill approaches the shoreline, it shall be graded at a slope of 2O:1 and shall be restored to tidal action with tidal marsh and native uplands vegetation on the outboard slope. D. Levees and Sea Walls. Projects shall construct levees or seawalls according to FEMA certification standards and the existing 100-year base flood elevation plus three feet of sea level rise. Any new portion of a levee above existing grade shall be sloped at least 10:1. Scour protection shall be vegetation rather than rip rap where possible. Floodwalls may be used on top of a levee to provide additional protection. <br />6.4.B. - Page 19