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

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designated on the City's FIRM. 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 subsection (d)(5)(C); (g) Recreational Vehicles. Recreational vehicles on sites within zones A, Al -A30, AE, AO, or AH 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 be placed on the site pursuant to a floodplain develop- ment permit issued under subsections (c) and (d) of Section 1308.03, and meet all standards of subsection (d) of this section. (h) Gas or Liquid Storage Tanks. (1) Within zone A, Al -A30, AE, AO, or AH, new or substantially im- proved above ground gas or liquid storage tanks shall be anchored to prevent flotation or lateral movement resulting from hydrodynamic and hydrostatic loads. (2) In zones V or VE, new or substantially improved above ground gas or liquid storage tanks shall be elevated with the bottom of the lowest horizontal supporting member above BFE on the landward side of build- ings. (3) In zones V or VE, new or substantially improved underground gas or liquid storage tanks must be installed below the lowest eroded ground elevation. (i) Assurance of Flood Carrying Ca an city. 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 hydrologic and hydraulic analysis, conducted by a registered profes- sional engineer, demonstrating that the proposed development would not result in any increase in the base flood elevation; or B. Development in floodway areas causing increases in the base flood elevation may be permitted provided all of the following are completed by the applicant: i. Meet the requirements to submit technical data in subsection (k)(1) of Section 1308.03; ii. An evaluation of alternatives, which would not result in increased base flood elevations and an explanation why these alternatives are not feasible; iii. Certification that no structures are located in areas that would be impacted by the increased base flood elevation; iv. Documentation of individual legal notices to all impacted property owners within and outside the City, explaining the impact of the pro- posed action on their property; and 37