(A) In addition to the damage prevention requirement of § 151.06, all buildings to be located in the SFHA shall be protected from flood damage below the FPE. This building protection requirement applies to the following situations:
(1) Construction or placement of a new building valued at more than $1,000;
(2) Structural alterations made to an existing building that increase the floor area by more than 20% or the market value of the building by more than 50%;
(3) Reconstruction or repairs made to a damaged building that are valued at or more than 50% of the market value of the building before the damage occurred;
(4) Installing a manufactured home on a new site or a new manufactured home on an existing site. This chapter does not apply to returning a manufactured home to the same site it lawfully occupied before it was removed to avoid flood damage; and
(5) Installing a travel trailer on a site for more than 180 days.
(B) This building protection requirement may be met by one of the following methods. The Building Official shall maintain a record of compliance with these building protection standards as required in § 151.03.
(1) A residential or nonresidential building may be constructed on permanent land fill in accordance with the following:
(a) The fill shall be placed in layers no greater than one foot deep before compaction;
(b) For residential structures have the lowest floor, including basement, elevated to one foot above the base flood elevation. Filling may not be used to accomplish this requirement in areas designated AH zones;
(c) For nonresidential structures have the lowest floor, including basement, elevated or floodproofed to one foot above the base flood elevation. Filling may not be used to accomplish this requirement in areas designated AH zones;
(d) The fill shall be protected against erosion and scour during flooding by vegetative cover, rip rap, or bulkheading. If vegetative cover is used, the slopes shall be no steeper than three horizontal to one vertical; and
(e) The fill shall not adversely affect the flow of surface drainage from or onto neighboring properties.
(2) A residential or nonresidential building may be elevated in accordance with the following:
(a) Be constructed with materials and utility equipment resistant to flood damage;
(b) Be constructed by methods and practices that minimize flood damage to other properties;
(c) Have all structural components below the base flood elevation designed to be water-tight with walls substantially impermeable to the passage of water and such structural components shall be designed to resist hydrostatic and hydrodynamic loads and the effects of buoyancy;
(d) The foundation and supporting members shall be anchored and aligned in relation to flood flows and adjoining structures so as to minimize exposure to known hydrodynamic forces such as current, waves, ice, and floating debris; and
(e) All areas below the FPE shall be constructed of materials resistant to flood damage. The lowest floor (including basement) and all electrical, heating, ventilating, plumbing, and air conditioning equipment and utility meters shall be located above the FPE. Water and sewer pipes, electrical and telephone lines, submersible pumps, and other waterproofed service facilities may be located below the FPE.
(3) Only a nonresidential building may be floodproofed in accordance with the following:
(a) A registered professional engineer shall certify that the building has been designed so that below 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; and
(b) Floodproofing measures shall be operable without human intervention and without an outside source of electricity.
(Prior Code, § 151.07) (Ord. 89-9, passed 12-18-1989)