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nonconforming structures may be flood proofed in accordance with <br />section 90-46 of this chapter. <br />b. As an alternative to construction on fill, low cost accessory structures <br />(under $10,000.00) may be internally floodproofed in accordance with the <br />following standards: <br />1.Accessory structures shall not be designed for human habitation. <br />2.Accessory structures in the floodway, if permitted, shall be <br />constructed and placed on the building site so as to offer the <br />minimum obstruction to the flow of flood waters: <br />(i)Whenever possible, structures shall be constructed with the <br />longitudinal axis parallel to the direction of flood flow; and <br />(ii)So far as practicable, structures shall be placed <br />approximately on the same flood flow lines as those of <br />adjoining structures. <br />3.Accessory structures not elevated on fill to the regulatory flood <br />protection elevation may be floodproofed to the FP-3 or FP-4 <br />floodproofing classification in the state building code provided the <br />accessory structure constitutes a minimal investment, does not <br />exceed 500 square feet in size at its largest projection, and for a <br />detached garage, the detached garage must be used solely for <br />parking of vehicles and limited storage. All floodproofed accessory <br />structures must meet the following additional standards: <br />(i)The structure must be adequately anchored to prevent <br />flotation, collapse or lateral movement of the structure and <br />shall be designed to equalize hydrostatic flood forces on <br />exterior walls; <br />(ii)Any mechanical and utility equipment in a structure must <br />be elevated to or above the regulatory flood protection <br />elevation or properly floodproofed; and <br />(iii)To allow for the equalization of hydrostatic pressure, there <br />must be a minimum of two "automatic" openings in the <br />outside walls of the structure having a total net area of not <br />