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

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necessary to preserve the historic character and design of the structure, shall be exempt from the development standards of Section 1308.23(d). (8) In AO Zones, new construction and substantial improvement shall have adequate drainage paths around structures on slopes to guide flood- waters around and away from the structure. (e) Nonresidential Structures. (1) New construction and substantial improvement of any commercial, industrial or other nonresidential structure shall meet the requirements of Section 1308.23(d)(1) -(3) and (5) - (8). (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 ofthe 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 Section 1308.23(e)(2)A, and B. (3) 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. (f) Accessory Structures. Relief to the elevation or dry floodproofing standards may be granted for accessory structures containing no more than 600 square feet. Such structures must meet the following standards: (1) They shall not be used for human habitation; (2) They shall be constructed of flood resistant materials; (3) They shall be constructed and placed on the lot to offer the mini- mum resistance to the flow of floodwaters; (4) They shall be firmly anchored to prevent flotation; (5) Service facilities such as electrical and heating equipment shall be elevated or floodproofed to or above the level of the flood protection elevation; and (6) They shall meet the opening requirements of Section 1308.23(d)(5)C.; (g) Recreational Vehicles. Recreational vehicles must meet at least one of the following standards: (1) They shall not be located on sites in special flood hazard areas for more than 180 days, or (2) They must be fully licensed and ready for highway use, or (3) They must meet all standards of Section 1308.23(d). (h) Above Ground Gas or Liquid Storage Tanks. All above ground gas or liquid storage tanks shall be anchored to prevent flotation or lateral movement resulting from hydrodynamic and hydrostatic loads. (i) Assurance of Flood Carrying Capacity. Pursuant to the purpose and methods of reducing flood damage stated in these regulations, the fol- lowing additional standards are adopted to assure that the reduction of the flood carrying capacity of watercourses is minimized: (1) Development in floodways. A. In floodway areas, development shall cause no increase in flood levels during the occurrence of the base flood discharge. Prior to issu- ance of a floodplain development permit, the applicant must submit a 16