Until a floodway is designated, no new construction, substantial
improvements or other development, including fill, shall be permitted
within any unnumbered or numbered A Zones or AE Zones on the community's
FIRM, unless it is demonstrated that the cumulative effect of the
proposed development, when combined with all other existing and anticipated
development, will not increase the water surface elevation of the
base flood more than one (1) foot at any point within the community.