The following standards shall apply in areas of shallow flooding denoted as AO zones on the FIRM.
(A) All new construction and substantial improvements of residential structures shall have the lowest floor, including basement, elevated above the crown of the nearest street to or above the depth number specified on the FIRM.
(B) All new construction and substantial improvements of nonresidential structures shall either:
(1) Have the lowest floor, including basement, elevated above the crown of the nearest street to or above the depth number specified on the FIRM; or
(2) Be floodproofed together with attendant utility and sanitary facilities.