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b. All new construction and substantial improvements of residential structures <br />within AO zone must have the lowest floor (including basement) elevated <br />above the highest adjacent grade at least as high as the depth number specified <br />in feet on the FIRM (at least two feet if no depth number is specified). <br />c. A registered professional engineer, architect or land surveyor shall submit an <br />elevation certification to the floodplain administrator that this standard is <br />satisfied. <br />(3) Nonresidential structures. <br />a. All new construction or substantial improvements of nonresidential <br />structures must have the lowest floor (including basement) elevated to two <br />feetene foot above the base flood elevation. Nonresidential structures within <br />zones AE and AH may not be flood - proofed in lieu of being elevated unless <br />a variance is granted pursuant to section 39.030, and provided that together <br />with all attendant utility and sanitary facilities, be designed so that below the <br />base flood elevation plus two feeten€ feet the structure is water -tight with <br />walls substantially impermeable to the passage of water, and with structural <br />components having the capability of resisting hydrostatic and hydrodynamic <br />loads and the effect of buoyancy. A registered professional engineer or <br />architect must certify that the provisions of this subsection are satisfied. The <br />FEMA floodproofing certificate must be prepared and submitted to the <br />floodplain administrator along with any corresponding operational and <br />maintenance plans. <br />b. All new construction and substantial improvements of nonresidential <br />structures within zone AO must: <br />Have the lowest floor (including basement) elevated above the highest <br />adjacent grade at least as high as the depth number specified in feet on <br />the FIRM (at least two feet if no depth number is specified), or <br />ii. Together with attendant utility and sanitary facilities be completely flood <br />proofed to that level to meet the flood proofing standard specified in <br />subsection (3)a. of this section. <br />(4) Elevated structures. For all new construction or substantial improvements, fully <br />enclosed areas below the lowest floor elevation may be usable solely for parking <br />of vehicles, building access, or storage. These enclosed areas must be designed <br />and constructed to allow for the entry and exit of floodwaters to automatically <br />equalize hydrostatic flood forces on exterior walls. <br />a. Designs for meeting this requirement must be certified by a professional <br />engineer or architect, to meet or exceed the following minimum criteria: <br />