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

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(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 to allow the automatic equalization of hydrostatic pressure may have an enclosure below the lowest floor provided 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 neces- sary to preserve the historic character and design of the structure, shall be exempt from the development standards of this subsection (d). (e) Nonresidential Structures. The requirements of this subsection (e) apply to new construction and to substantial improvements of nonresi- dential structures in zones A, Al -30, AE, AO, and AH, when designated on the City's effective FIRM, and when designated on a preliminary or final FIRM issued by FEMA under the circumstances provided in sub- section (m) of Section 1308.03. (1) New construction and substantial improvement of any commercial, industrial or other nonresidential structure shall meet the requirements of subsection (d)(l) -(3) and (5) -(7). (2) New construction and substantial improvement of any commercial, industrial or other non - residential structure shall either have the lowest floor, including basement, elevated to or above the level of the flood pro- tection elevation; or, together with attendant utility and sanitary facili- ties, shall meet all of the following standards: A. be dry floodproofed so that the structure is watertight with walls substantially impermeable to the passage of water to the level of the flood protection elevation; B. have structural components capable of resisting hydrostatic and hy- drodynamic loads and effects of buoyancy; and, C. be certified by a registered professional engineer or architect, through the use of a Federal Emergency Management Agency Flood - proofing Certificate, that the design and methods of construction are in accordance with this subsection (e)(2)A and B. (3) Where flood protection elevation data are not available the struc- ture shall have the lowest floor, including basement, elevated at least two feet above the highest adjacent natural grade. (f) Accessory Structures. Structures that are 600 square feet or less which are used for parking and storage only are exempt from elevation or dry floodproofing standards within zones A, Al -30, AE, AO, and All 36