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(B) For nonresidential new construction, improvements to <br /> repetitive loss structures, and substantial improvements: <br /> The lowest floor shall be elevated or floodproofed <br /> to or above the base flood elevation. If the lowest floor is <br /> below the base flood elevation, then the structure together <br /> with attendant utility and sanitary facilities shall be <br /> designed, [and] constructed, and certified by a registered <br /> professional engineer or architect such that: <br /> (i) The structure is watertight below the base flood <br /> elevation. <br /> (ii) The walls aze substantially impermeable to the <br /> passage of water. <br /> (iii) The structural components aze capable of resisting <br /> hydrostatic and hydrodynamic loads and the effects <br /> of buoyancy. <br /> (C) Within Zone AH, new construction, improvements to <br /> repetitive loss structures, and substantial improvement shall <br /> be required to provide adequate drainage paths azound <br /> structures on slopes to guide flood waters azound and away <br /> from proposed structures. <br /> Fully enclosed areas below the lowest door that are <br /> useable solely for parking of vehicles, building access, or <br /> storage in an area other than a basement and which are <br /> subiect to flooding, shall be designed to automatically <br /> equalize hydrostatic flood forces on exterior walls by <br /> allowing for the entry and exit of flood waters. Designs <br /> for meeting this requirement must either be certified bra <br /> registered professional engineer or architect or meet or <br /> exceed the following criteria: A minimum of two <br /> openings having a total net area of not less than one square <br /> inch for every square foot of enclosed area subject to <br /> flooding shall be provided. The bottom of all openings <br /> shall be no higher than one foot above grade. Openings <br /> may be equiQped with screens, louvers, valves, or other <br /> coverings or devices provided that they permit the <br /> automatic entry and exist of floodwaters. <br /> <br /> (2) Within Zone AO: <br /> (A) For [new] residential new construction, improvements to <br /> repetitive loss structures, and substantial improvements: <br /> The lowest floor shall be elevated above the highest <br /> adjacent grade at least as high as the depth number <br /> specified in feet on the FIRM, or at least two feet if no <br /> depth number is specified. <br /> (B) For nonresidential new construction, improvements to <br /> repetitive toss structures, and substantial improvements: <br /> 16 <br /> <br />