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A structure or use of a structure or premises which lawfully existed before the enactment of these provisions, but which is not in conformity with these provisions, may be continued subject to the following conditions.
(A) Existing structures in the floodway area shall not be expanded or enlarged unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practices that the proposed expansion would not result in any increase in the base flood elevation.
(B) Any modification, alteration, repair, reconstruction or improvement of any kind to a structure and/or use located in any floodplain areas to an extent or amount of less than 50% of its market value shall conform to the VA USBC.
(C) The modification, alteration, repair, reconstruction or improvement of any kind to a structure and/or use, regardless of its location in a floodplain area to an extent or amount of 50% or more of its market value shall be undertaken only in full compliance with this chapter and shall require the entire structure to conform to the VA USBC.
(1996 Code, § 176-122)