Located within the areas of special flood hazard established in this chapter are areas designated as shallow flooding. These areas have special flood hazards associated with base flood depths of one to three feet (3') where a clearly defined channel does not exist and where the path of flooding is unpredictable and indeterminate; and therefore, the following provisions apply:
A. All new construction and substantial improvements of residential structures shall have the lowest floor, including basement, elevated above the highest adjacent grade at least as high as the depth number specified on the community's FIRM, or at least two feet (2') if no depth number is specified.
B. All new construction and substantial improvements of nonresidential structures shall:
1. Have the lowest floor, including basement, elevated above the highest adjacent grade at least as high as the depth number specified on the FIRM, or at least two feet (2') if no depth number is specified; or
2. Together with attendant utility and sanitary facilities, be completely floodproofed to or above that level so that any space below that level is watertight with walls substantially impermeable to the passage of water with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy.
C. A registered professional engineer or architect shall submit a certification to the floodplain administrator that the standards of this section, as proposed in subsection 10-2-10B of this chapter are satisfied.
D. Adequate drainage paths around structures on slopes are required within zones AH or AO to guide floodwaters around and away from proposed structures. (1990 Code § 12-519)