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high as the depth number specified in feet on the community's FIRM (at least two three feet if no depth number is specified). (2) All new construction and substantial improvements of nonresidential structures shall have ; a. Havethe lowest floor (including basement) elevated at least to orone foot above the base flood elevation, or one foot above the highest adjacent grade at least as high as the depth number specified in feet on the community's FIRM (at least two three feet if no depth number is specified), whichever is higher, or b. Together with attendant utility and sanitary facilities be designed so that below one foot above the base specified flood depth in an AO zone, or below one foot above the base flood elevation in an AH zone, level 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 of effects of buoyancy. (3) A registered professional engineer or architect shall submit a certification to the floodplain administrator that the standards of this section, as proposed in section 94-63 are satisfied. (4) Require within zones AH or AO adequate drainage paths around structures on slopes, to guide flood waters around and away from proposed structures. Sec. 94-90. - Floodways. Located within areas of special flood hazard established in section 94-38 of this chapter are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of flood waters which carry debris, potential projectiles and erosion potential, the following provisions shall apply: (1) Encroachments are prohibited, including fill, new construction, substantial improvements and other development within the adopted regulatory floodway unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practice that the proposed encroachment would not result in any increase in flood levels within the community during the occurrence of the base flood discharge. (2) If section 94-90(1) above is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of division 3. (3) Under the provisions of 44 CFR Chapter 1, Section 65.12, of the National Flood Insurance Program Regulation, a community may permit encroachments within the adopted regulatory floodway that would result in an increase in base flood elevations, 16