(A) In addition to the damage prevention requirements of § 46.06, all buildings to be located in the SFHA shall be protected from flood damage below the FPE.
(B) This building protection requirement applies to the following situations:
(1) Construction or replacement of a new building valued at more than $1,000;
(2) Improvements made to an existing building that increase the first-floor area by more than 20%;
(3) Reconstruction or repairs made to a damaged building that are valued at or more than 50% of the value of the building before the damage occurred; and
(4) Installing a mobile home on a new site or a new mobile home on an existing site. This building protection requirement does not apply to returning a mobile home to the same site it formerly lawfully occupied.
(C) This building protection requirement may be met by any one of the following methods.
(1) A building may be constructed on permanent landfill in accordance with the following.
(a) The area to be filled shall be cleared of all standing trees, brush, down timber, trash and other growth or objects unsuitable for use as foundation material.
(b) The fill shall be placed in layers no greater than one foot deep before compaction.
(c) The surface of the fill shall be at or above the FPE. The fill shall extend at least ten feet beyond the foundation of the building before sloping below the FPE.
(d) The fill shall be protected- against erosion and scour during flooding by vegetation cover, rip rap or bulk-heading. If vegetative cover is used, the slopes shall be no steeper than three horizontal to one vertical.
(e) The fill shall not adversely affect the flow of surface drainage from or onto neighboring properties.
(f) The Building Inspector shall maintain a record of the “as built” elevation of the lowest floor of the building.
(2) A building may be elevated in accordance with the following.
(a) The building or improvements shall be elevated on stilts, piles, walls, crawl space or other foundation that is permanently open to flood waters and not subject to damage by hydrostatic pressures.
(b) The foundation and supporting members shall be anchored, shaped and aligned so as to minimize exposure to known hydrodynamic forces such as current, waves and floating debris.
(c) All areas below the FPE shall be constructed of materials resistant to flood damage. The bottom of the joists of the lowest floor and all utility meters shall be located at or above the FPE.
(d) The Building Inspector shall maintain a record of the “as built” elevation of the lowest floor.
(e) No area below the FPE shall be used for storage of items or materials subject to flood damage unless such items or materials are declared “property not covered” by a Standard Flood Insurance Policy of the National Flood Insurance Program.
(f) Any future alteration of the area below the FPE that violates the requirements of this division (B) shall be deemed a violation of this chapter. The Building Inspector shall inform the applicant that any such alteration is considered a willful act to increase flood damages and therefore will cause coverage by a standard flood insurance policy to be suspended.
(g) No mobile home may be placed on a new site located within an identified floodway.
(3) A non-residential building may be flood-proofed in accordance with the following.
(a) A registered professional engineer shall certify that the building has been designed so that below the FPE, the structure and attendant utility facilities are water-tight and capable of resisting the affects of the base flood. The building design shall take into account flood velocities, duration, rate of rise, hydrostatic and hydrodynamic forces, the effects of buoyancy and impacts from debris or ice.
(b) Flood-proofing measures shall be operable without human intervention and without an outside source of electricity.
(c) The bottom of the floor joists of the first floor of a residential building shall be at or above the FPE.
(d) The Building Inspector shall maintain the engineer1s certificate and a record of the “as built” elevation to which the building was flood-proofed.