8415-93 Amending Chapter 21 Zoning Floodplain Regulations

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• (e) The top of the lowest floor, including basements, shall be at or above the Flood Protection Grade. 2. A residential or nonresidential building may be elevated in accordance with the following: (a) The building or improvements shall be elevated on posts, piers, columns, extended walls, or other types of similar foundations provided: (1) Walls of any enclosure below the elevated floor shall be designed to automatically equalize hydrostatic flood forces on the walls by allowing for the entry and exit of flood waters, through providing a minimum of two openings, in addition to doorways and windows, having a total area of one (1) square foot for every two (2) square feet of enclosed area subject to flooding. The bottom of all such openings shall be no higher than one (1) foot above grade. (2) Any enclosure below the elevated floor is used for storage and building access. (b) 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 buoyancy current, waves, ice, and floating debris. (c) All areas below the Flood Protection Grade shall be constructed of materials resistant to flood damage. The top of the lowest floor, including basement, and all electrical, heating, ventilating, plumbing, and air conditioning equipment and utility meters shall be located at or above the Flood Protection Grade. Water and sewer pipes, electrical and telephone lines, submersible pumps, and other waterproofed service facilities may be located below the Flood Protection Grade. 3. The manufactured home, mobile home, recreation vehicle, or trailer to be installed or substantially improved on a site for more than 180 days must meet one of the following anchoring requirements: (a) The manufactured home or mobile home shall be elevated on a permanent foundation such that the lowest floor shall be at or above the Flood Protection Grade and securely anchored to an adequately anchored foundation system to resist flotation, collapse, and lateral movement. This requirement applies to all manufactured homes or mobile homes to be placed on a site; (1) Outside a manufactured home or mobile home park or subdivision; (2) In a new manufactured home or mobile home park or subdivision; (3) In an expansion to an existing manufactured home or mobile home park or subdivision; or (4) In an existing manufactured home or mobile home park or subdivision on which a manufactured home or mobile home has incurred "substantial damage" as a result of a flood. (b) This requirement applies to all manufactured homes or mobile homes to be placed on a site in an existing manufactured home or mobile home park or subdivision that has not been substantially damaged by a flood. The manufactured home or mobile home shall be elevated so that the lowest floor of the manufactured home or mobile home chassis is supported by reinforced piers or other foundation elements that are no less than 36 inches in height above grade and be securely anchored to an adequately anchored foundation system to resist flotation, collapse, and lateral movement. 4. Recreation vehicles or trailers placed on a site shall either: (a) Be on the site for less than 180 consecutive days; (b) Be fully licensed and ready for highway use, defined as being on its wheels or jacking system, is attached to the site only by quick disconnect type utilities and security devices, and has no permanently attached additions; or