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(2) Nonresidential Construction. New construction or substantial improvement of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including basement, elevated to one foot above the level of the base flood elevation, or together with attendant utility and sanitary facilities, be flood- proofed so that below such 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 and effects of buoyancy. A registered professional engineer or architect shall certify that the standards, of this subsection are satisfied. (3) Floodways. Located within areas of special flood hazard established in section 12A-3 are areas designated as floodways. Since the floodway is an extremely hazard- ous area due to the velocity of flood waters which carry debris, potential projectiles and erosion potential, the following provisions shall apply: (a) Prohibit encroachments, including fill, new construction, substantial improvements and other develop- ments unless certification by a professional registered engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels during occurrence of the base flood discharge. (b) If item (a) of this subsection is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of this section and section 12A-12. Sec. 12A-14. Same--Standards for subdivision PrOPosals. (1) Ail subdivision proposals and other proposed new developments shall be consistent with the need to minimize flood damage. (2) Ail subdivision proposals shall have public utili- ties and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage. (3) Ail subdivision proposals shall have adequate drainage provided to reduce exposure to flood hazards. (4) Base flood elevation data shall be provided for subdivision proposals and other proposed development which is greater than either fifty lots or five acres. Sec. 12A-15. Nonconforming uses. (1) A structure or the use of a structure or premises which was lawful before the passage or amendment of the ordinance codified in this chapter but is not in con- formity with the provisions of this chapter may be continued subject to the following conditions: (a) No such use or substantial improvement of that use shall be expanded, changed, enlarged, or altered in a way which increases its nonconformity. (b) If such use is discontinued for twelve consecutive months, any future use of the building premises shall conform to this chapter. (2) If any nonconforming use or structure is destroyed by any means, including flood, it shall not be recon- structed if cost is more than fifty percent of the market value of the structure before the damage occurred, except if it is reconstructed in conformity with the provisions of this chapter. This limitation does not include the cost of any alteratiom to comply with existing state or local health, sanitary, building, or safety codes or regu- lations or the cost of any alteration of a structure listed on the National Register of Historic Places, a