(a) On the basis of the most recent available base flood elevation data the following standards shall apply in the flood hazard area zone:
(1) All new construction and substantial improvements of residential structures shall have the lowest portion of all horizontal structural members supporting floors, excluding footings, pile caps, piling, non-structural slabs, girders and grade beams, located at or above the base flood level. All basement floor surfaces shall be located at or above the base flood level.
(2) All new construction and substantial improvements of non-residential structures shall have either:
A. The lowest portion of all horizontal structural members supporting floors located at or above the base flood level;
B. Be constructed such that below base flood level, together with attendant utility and sanitary facilities, the structure is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. A registered professional engineer or architect shall certify that the standards of this division (a)(2)B. are satisfied, and that the floodproofing methods employed are adequate to withstand the flood depths, pressures and velocities, impact and uplift forces and other factors associated with a base flood in the location of the structure. Such certification shall be submitted on the form provided by the Michigan Department of Natural Resources, and shall indicate the elevation to which the structure is floodproofed; or
C. All basement floor surfaces shall also be located at or above the base flood level.
(b) The most recent base flood elevation data received from the Federal Insurance Administration shall take precedence over data from other sources.
(Ord. 220, passed 2-13-1991)