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b. Does not meet a 3:1 riverside slope or other appropriate engineering <br />design standards for stability (e.g., over -steepened side slopes for existing soil and/or <br />flow conditions); and <br />c. Repair of the existing structure will not cause or increase significant <br />adverse ecological impacts to the shoreline. <br />5. Rehabilitated or replaced flood hazard reduction structures shall not extend <br />the toe of slope any further waterward of the OHWM than the existing structure. <br />6. New structural flood hazard reduction measures, such as levees, berms and <br />similar flood control structures shall be placed landward of the floodway as determined <br />by the best information available. <br />7. New, redeveloped or replaced structural flood hazard reduction measures <br />shall be placed landward of associated wetlands, and designated fish and wildlife habitat <br />conservation areas. <br />8. No commercial, industrial, office or residential development shall be located <br />within a floodplain without a Flood Control Zone Permit issued by the City. No <br />development shall be located within a floodway except as otherwise permitted. <br />9. New, redeveloped or replaced flood hazard reduction structures must have <br />an overall waterward slope no steeper than 3:1 unless it is not physically possible to <br />achieve such as slope. A floodwall may be substituted for all or a portion of a levee back <br />slope where necessary to avoid encroachment or damage to a structure legally <br />constructed prior to the date of adoption of this subsection, if structure has not lost its <br />nonconforming status, or to allow area for waterward habitat restoration development. <br />The floodwall shall be designed to provide 15 feet of clearance between the levee and <br />the building, or to preserve access needed for building functionality while meeting all <br />engineering safety standards. A floodwall may also be used where necessary to prevent <br />the levee from encroaching upon a railroad easement recorded prior to the date of <br />adoption of this subsection. <br />F. Shoreline Stabilization. The provisions of this section apply to those structures <br />or actions intended to minimize or prevent erosion of adjacent uplands and/or failure of <br />riverbanks resulting from waves, tidal fluctuations or river currents. Shoreline stabilization <br />or armoring involves the placement of erosion resistant materials (e.g., large rocks and <br />boulders, cement, pilings and/or large woody debris (LWD)) or the use of bioengineering <br />techniques to reduce or eliminate erosion of shorelines and risk to human infrastructure. <br />This form of shoreline stabilization is distinct from flood control structures and flood <br />hazard reduction measures (such as levees). The terms "shoreline stabilization," <br />"shoreline protection" and "shoreline armoring" are used interchangeably. <br />1. Shoreline protection shall not be considered an outright permitted use and <br />shall be permitted only when it has been demonstrated through a Riverbank Analysis and <br />report that shoreline protection is necessary for the protection of existing legally <br />established structures and public improvements. <br />W: Legislative Development\SMP-Zoning Code changes 2-25-20 <br />MD:bjs Review and analysis by Barbara Saxton Page 20 of 64 <br />