11-23-15 Agenda, Packet & Committee Meeting Notice

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vi. Reconstruction or repairs made to a repetitive loss structure; and vii. Addition or improvement made to any existing structure with a previous addition or improvement constructed since the community's first floodplain ordinance. (B) Residential Structures. New construction or substantial improvement of any residential structure (or manufactured home) shall have the lowest floor; including basement,at or above the FPG(two feet above the base flood elevation). Should solid foundation perimeter walls be used to elevate a structure, openings sufficient to facilitate the unimpeded movements of floodwaters shall be provided in accordance with the standards of Section 21- 12.05 (2)(D). (C) Non-Residential Structures. New construction or substantial improvement of any commercial, industrial,or non-residential structure(or manufactured home) shall either have the lowest floor,including basement, elevated to or above the FPG (two feet above the base flood elevation) or be floodproofed to or above the FPG. Should solid foundation perimeter walls be used to elevate a structure, openings sufficient to facilitate the unimpeded movements of floodwaters shall be provided in accordance with the standards of Section 21- 12.05 (2) (D). Structures located in all "A Zones"may be floodproofed in lieu of being elevated if done in accordance with the following: i. A Registered Professional Engineer or Architect shall certify that the structure has been designed so that below the FPG,the structure and attendant utility facilities are watertight and capable of resisting the effects of the regulatory flood. The structure design shall take into account flood velocities, duration, rate of rise,hydrostatic pressures, and impacts from debris or ice. Such certification shall be provided to the floodplain administrator as set forth in Section 21-12.04 (3) (L). ii. Floodproofing measures shall be operable without human intervention and without an outside source of electricity. (D) Elevated Structures. New construction or substantial improvements of elevated structures shall have the lowest floor at or above the FPG. Elevated structures with fully enclosed areas formed by foundation and other exterior walls below the flood protection grade shall be designed to preclude finished living space and designed to allow for the entry and exit of floodwaters to automatically equalize hydrostatic flood forces on exterior walls. Designs must either meet the following minimum criteria: