(A) Shallow flooding areas appear on FIRMs as AO Zones with depth designations. The base flood depths in these zones range from one to three feet above ground where a clearly defined channel does not exist, or where the path of flooding is unpredictable and where velocity flow may be evident.
(B) Such flooding is usually characterized as sheet flow. In these areas, the following provisions apply.
(1) New construction and substantial improvements of residential structures and manufactured homes within AO Zones shall have the lowest floor (including basement) elevated above the highest grade adjacent to the building, one foot or more above the depth number specified on the FIRM (at least two feet if no depth number is specified).
(2) New construction and substantial improvements of non-residential structures within AO Zones shall either:
(a) Have the lowest floor (including basement) elevated above the highest adjacent grade of the building site, one foot or more above the depth number specified on the FIRM (at least two feet if no depth number is specified); or
(b) Together with attendant utility and sanitary facilities, be completely flood- proofed to or above that lever so that any space below that level is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. If this method is used, compliance shall be certified by a registered professional engineer or architect as in § 153.41(B)(3) of this chapter.
(3) Require adequate drainage paths around structures on slopes to guide flood waters around and away from proposed structures.
(4) Recreational vehicles placed on sites with AO Zones on the community’s FIRM either:
(a) Be on the site for fewer than 180 consecutive days;
(b) Be fully licensed and ready for highway use, on its wheels or jacking system, is attached to the site only by quick disconnect types utilities and security devices, and has no permanently attached additions; or
(c) Meet the requirements above and the elevation and anchoring requirements for manufactured homes.
(Ord. 2000-01, passed 4-4-2000)