A. When the Federal Emergency Management Agency has designated areas of special flood hazard on the community's FIRM but has neither produced water surface elevation data (these areas are designated Zone A or V on the FIRM) nor identified a floodway, the Director shall obtain, review and reasonably utilize any base flood elevation and floodway data available from a federal, state or other source, including data developed pursuant to § 106-153, as criteria for requiring that new construction, substantial improvements or other proposed development meet the requirements of this article.

B. When base flood elevation data is not available, the Director may use flood information from any other authoritative source, such as historical data, to establish flood elevations within the areas of special flood hazard for the purposes of this article.

See Article XIX: Flood Damage Prevention for complete, detailed information.