When base flood elevation data has not been provided in accordance with Section 39.05.007, Basis for Establishing Areas of Special Flood Hazard, the Floodplain Administrator shall obtain, review and reasonably utilize any base flood elevation data and floodway data available from a federal, state, or other sources to administer the provisions of Sections 39.05.012, General Standards, through Section 39.05.014, Standards for Subdivision Proposals.