(a) General standards. In all areas of special flood hazards the following standards are required.
(1) All new construction and substantial improvements shall be anchored to prevent flotation, collapse or lateral movement of the structure.
(2) Construction materials and methods:
a. All new construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage; and
b. All new construction and substantial improvements shall be constructed using methods and practices that minimize flood damage.
(3) All mobile homes shall be anchored to resist flotation, collapse or lateral movement by providing over-the-top and frame ties to ground anchors. Special requirements shall be that:
a. Over-the-top ties be provided at each of the four corners of the mobile home, with two additional ties per side at intermediate locations, with mobile homes less than 50 feet long requiring one additional tie per side;
b. Frame ties be provided at each corner of the home with five additional ties per side at intermediate points, with mobile homes less than 50 feet long requiring four additional ties per side;
c. All components of the anchoring system be capable of carrying a force of 4,800 pounds; and
d. Any additions to the mobile home be similarly anchored.
(1) All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system.
(2) New and replacement sanitary sewage systems shall be designed to minimize or eliminate flood waters into the system and discharge from the systems into flood waters.
(3) On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
(c) Subdivision proposals.
(1) All subdivision proposals shall be consistent with the need to minimize flood waters.
(2) All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical and water systems, located and constructed to minimize flood damage.
(3) All subdivision proposals shall have adequate drainage provided to reduce exposure to flood damage.
(4) Base flood elevation data shall be provided, the cumulative effect of any proposed development, when combined with all other existing and anticipated development, shall not increase the water surface elevation of the base flood more than one-tenth of a foot at any point.
(1) Residential construction. New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to or above base flood elevation.
(2) Nonresidential construction. New construction and substantial improvement of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including the basement elevated to the level of the base flood elevation; or, together with the attendant utility and sanitary facilities, shall:
a. Be floodproofed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water;
b. Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and/or
c. Be certified by a registered professional engineer or architect that the standards of this subsection are satisfied. Such certification shall be provided to the officials as set forth in § 50-173(b)(3).
(3) Mobile homes.
a. Mobile homes shall be anchored in accordance with § 50-177(a)(3); and
b. For the new mobile home parks and mobile home subdivisions; for expansions to existing mobile home parks and mobile home subdivisions; for existing mobile home parks and mobile home subdivisions where repair, reconstruction or improvement of the streets, utilities and pads equals or exceeds 50% of the value of the streets, utilities and pads before the repair, reconstruction or improvement has commenced; and for mobile homes not placed in mobile home parks or mobile home subdivisions, require that:
1. Stands or lots are elevated on compacted fill or on pilings so that the lowest floor of the mobile home will be at or above the base flood level;
2. Adequate surface drainage access for a hauler are provided; and
3. In the instance of elevation on pilings that:
i. Lots are large enough to permit steps;
ii. Piling foundations are placed in stable soil no more than ten feet apart; and
iii. Reinforcement is provided for pilings more than six feet above the ground level.
(Ord. 2787, passed 12-22-1980; Ord. 2789, passed 2-23-1981)