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05/21/2018 <br />57.10 Measures Addressing Sea Level Rise <br />The Mixed Use Waterfront Zoning District provides for an adaptation approach to sea level rise. <br />Strategies to accommodate sea level rise shall be approved by the appropriate review authority, <br />but shall meet the goal of accommodating an increase in sea level of 3 feet by 2100. Methods for <br />achieving long-term flood hazard reduction include, but are not limited to, any combination of the <br />following approaches and shall be approved by the City Engineer: <br />A. Elevation of Lowest Floor. The lowest floor of structures shall be built at or above the <br />existing 100 -year base flood elevation plus 3 feet of sea level rise. Elevation change from <br />any future development to the waterfront should be accommodated through graded <br />slopes and low retaining walls, as needed. This increased elevation shall not be required for <br />structures wholly within a FEMA -accredited levee or seawall system. <br />B. Setbacks. Required setbacks from waterfront areas, as described in Table 57.4 <br />(Development Standards), shall not only provide for public access and recreation but <br />provide additional buffer to accommodate sea level rise. <br />C. Managed Retreat. Projects shall provide for a phased conversion of the outboard portions of <br />any project area to tidal marsh. When the outboard edge of the fill approaches the shoreline, <br />it shall be graded at a slope of 20:1 and shall be restored to tidal action with tidal marsh and <br />native uplands vegetation on the outboard slope. <br />D. Levees and Sea Walls. Projects shall construct levees or seawalls according to FEMA <br />certification standards and the existing 100 -year base flood elevation plus three feet of sea <br />level rise. Any new portion of a levee above existing grade shall be sloped at least 10:1. Scour <br />protection shall be vegetation rather than rip rap where possible. Floodwalls may be used <br />on top of a levee to provide additional protection. <br />ATTY/ORD.465/RC ORD—ZONING MIXED USE WATERFRONT DISTRICT ORDINANCE NO. 1130-373 <br />REV: 05-02-18 PR MUFF NO. 601 <br />Page 16 of 16 <br />