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. Background In cooperation with the CWCB, the county has mapped the laO-year floodplain for the White River on 2-foot contour interval maps. The results of the study were published in a floodplain informaiton report and the floodplain administrator maintains a set of official floodplain maps, on a scale of 1 inch equals 200 feet, showing topography, buildings, roads, and the lOa-year flood boundaries. The county is enrolled in the Emergency Phase of the National Flood Insurance Program (NFIP). A Special Flood Hazard Boundary Map has been published by the Federal Emergency Management Agency (FEMA) and is in substantial agreement with the earlier study which has been designated and approved by the CWCB. The floodplain ordinance adopted by the county satisfies FEMA's minimum requirements for the Emergency Program. The key elements are briefly listed below: . a two district floodplain based on the flood hazard area concept with an' lS-inch depth separating the high and low hazard areas. . a 1.0 foot freeboard (i.e., the lowest inhabitable floor must be 1.0 feet above the laO-year flood elevation) . . a 15 foot offset is required from the lOa-year floodplairi boundary to provide for evacuation and to minimize potential erosion problems. . . Floodproofing must be provided in the low hazard area where laO-year flood velocities exceed 3 feet per second. Materials In accordance wittt procedures established by the county planning commission, the following materials have been provided for the review: . a copy of the preliminary site plan prepared by the applicant Which also shows a lOa-year floodplain . the official administrative map of the existing lOa-year floodplain . depth vs. damage curves for various residential structures . a table of flood insurance rates . . an engineering analysis provided by the applicant at his expense showing the floodplain as it would appear after construction if the project were constructed on fill material. -')-