(A) General standards. In all areas of special-flood hazards, the following provisions are required:
(1) All new construction and substantial improvements shall be designed and adequately anchored to prevent flotation, collapse, or lateral movement of the structures;
(2) All new construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage;
(3) All new construction or substantial improvements shall be constructed by methods and practices that minimize flood damage;
(4) All new and replacement water-supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system;
(5) New and replacement sanitary-sewer systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharges from the systems into flood waters; and
(6) On-site waste-disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
(B) Specific standards. In all areas of special-flood hazards the following provisions are required:
(1) Residential construction: New construction or substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to 1 foot above base-flood elevation.
(2) Nonresidential construction: New construction or substantial improvement of any commercial, industrial, or other nonresidential structure shall either have the lowest floor, including basement, elevated to 1 foot above the base-flood elevation or, together with attendant utility and sanitary facilities, be flood-proofed so that below the base-flood level the structure is watertight with walls substantially impermeable to the passage of water and with components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. A registered professional engineer or architect shall certify that the flood-proofing methods are adequate to withstand the flood depths, pressure, velocities, impact and uplift forces and other factors associated with the base flood. Such certification shall be provided to the township.
(3) Mobile homes:
(a) No mobile home shall be placed in a floodway area, except in an existing mobile home park or existing mobile home subdivision.
(b) All mobile homes placed within the floodway and flood-way fringe areas shall be anchored to resist flotation, collapse, or lateral movement by providing over-the-top ties to ground anchors. Specific requirements shall be that:
1. Over-the-top ties be provided at each of the 4 corners of the mobile home, with 2 additional ties per side at intermediate locations and mobile homes less than 50 feet long requiring 1 additional tie per side;
2. Frame ties be provided at each corner of the home with 5 additional ties per side at intermediate points and mobile homes less than 50 feet long requiring 4 additional ties per side;
3. All components of the anchoring system be capable of carrying a force of 4,800 pounds; and
4. Any additions to the mobile home be similarly anchored.
(c) For new mobile home parks and subdivisions, for expansions to existing mobile home parks and subdivisions, for existing mobile home parks and subdivisions where the repair, reconstruction, or improvement has commenced, and for mobile homes not placed in a mobile home park or subdivision, it is required that:
1. Stands or lots are elevated on compacted fill or on pilings so that the lowest floor of the mobile home will be 1 foot above the base-flood level;
2. Adequate surface drainage and access for a hauler are provided; and
3. In the instance of elevation on pilings;
a. Lots are large enough to permit steps;
b. Piling foundations are placed in stable soil no more than 10 feet apart; and
c. Reinforcement is provided for pilings more than 6 feet above the ground level.
(4) Floodways: Included within the areas of special flood hazard are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of flood waters which carry debris, potential projectiles and erosion potential, the following provisions shall apply:
(a) Encroachments, including new construction, substantial improvements, and other developments are prohibited unless certification by a professional registered engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels during occurrence of the base-flood discharge.
(b) All new construction and substantial improvements shall comply with all applicable flood-hazard reduction provisions of this chapter.
(c) The placement of any mobile homes is prohibited except in an existing mobile home park or existing mobile subdivision.
(Ord. passed 3-25-2008)