22-19 - Amend Chapter 1308 flood damage prevention following FEMA flood zone update - ordinance

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(4) In all areas of special flood hazard where base flood elevation data are not available, the applicant shall provide a hydrologic and hydraulic engineering analysis that generates base flood elevations for all subdivi- sion proposals and other proposed developments containing at least 50 lots or 5 acres, whichever is less. (5) The applicant shall meet the requirement to submit technical data to FEMA in Section 1308.20(a)(1)D. when a hydrologic and hydraulic analysis is completed that generates base flood elevations as required by Section 1308.23(c)(4). (d) Residential Structures. (1) New construction and substantial improvements shall be anchored to prevent flotation, collapse, or lateral movement ofthe structure result- ing from hydrodynamic and hydrostatic loads, including the effects of buoyancy. Where a structure, including its foundation members, is ele- vated on fill to or above the base flood elevation, the requirements for anchoring (1308.23(d)(1)) and construction materials resistant to flood damage (1308.23(d)(2)) are satisfied. (2) New construction and substantial improvements shall be con- structed with methods and materials resistant to flood damage. (3) New construction and substantial improvements shall be con- structed with electrical, heating, ventilation, plumbing and air condition- ing equipment and other service facilities that are designed and /or ele- vated so as to prevent water from entering or accumulating within the components during conditions of flooding. (4) New construction and substantial improvement of any residential structure, including manufactured homes, shall have the lowest floor, in- cluding basement, elevated to or above the flood protection elevation. In Zone AO areas with no elevations specified, the structure shall have the lowest floor, including basement, elevated at least two feet above the highest adjacent natural grade. (5) New construction and substantial improvements, including manu- factured homes, that do not have basements and that are elevated to the flood protection elevation using pilings, columns, posts, or solid founda- tion perimeter walls with openings sufficient to allow unimpeded move- ment of flood waters may have an enclosure below the lowest floor pro- vided the enclosure meets the following standards: A. Be used only for the parking of vehicles, building access, or storage; and B. Be designed and certified by a registered professional engineer or architect to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters; or C. Have a minimum of two openings on different walls having a total net area not less than one square inch for every square foot of enclosed area, and the bottom of all such openings being no higher than one foot above grade. The openings may be equipped with screens, louvers, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters. (6) Manufactured homes shall be affixed to a permanent foundation and anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy. Methods of anchoring may include, but are not limited to, use of over the top or frame ties to ground anchors. (7) Repair or rehabilitation of historic structures upon a determination that the proposed repair or rehabilitation will not preclude the structure's continued designation as a historic structure and is the minimum IC.