(1) Designation and Mapping. All lands classified as floodway, floodplain or special flood hazard areas in the Federal Emergency Management Agency report titled “The Flood Insurance Study for Clallam County” dated February 23, 2001, as now or hereafter amended, with accompanying Flood Insurance Rate and Boundary Maps, are designated as frequently flooded areas. The study and maps are on file at Clallam County. When base flood elevation data has not been provided in the Flood Insurance Study, the Administrator shall obtain, review, and reasonably utilize any base flood elevation and floodway data available from the Federal Emergency Management Agency, Washington State Department of Ecology, or other qualified source. Where base flood elevation data and floodway delineation are not available either through the Flood Insurance Study or from a qualified source, historical data, high water marks, photographs of past flooding, etc., shall be used to determine base flood elevations. Special flood hazard areas shall be delineated by engineering studies that meet the specifications of 44 CFR § 65 and approved by FEMA and then adopted by Clallam County. The only method to alter data or maps related to special flood hazard areas is through an officially processed map change, through a physical map revision, a County-wide remapping, or a Letter of Map Change (LOMC) submitted to FEMA and approved. Qualified professionals may submit these studies to FEMA to alter the location of the special flood hazard areas through the Letter of Map Change (LOMC) process, with the concurrence of the Administrator.