A. Permitted Uses:
1. The uses listed in subsection 11.54A, "Permitted Uses", of this chapter, are permitted uses.
2. All other uses are subject to the floodway/flood fringe evaluation criteria specified in subsection B of this section. Section 11.54 of this chapter applies if the proposed use is determined to be in the Floodway District. Section 11.55 of this chapter applies if the proposed use is determined to be in the Flood Fringe District.
B. Procedures For Floodway And Flood Fringe Determination Within General Floodplain District:
1. Upon receipt of an application for a permit or other approval within the General Floodplain District, the Zoning Administrator must obtain, review and reasonably utilize any regional flood elevation and floodway data available from a Federal, State or other source.
2. If regional flood elevation and floodway data are not readily available or the application involves a project exceeding the lesser of five (5) acres or fifty (50) lots, the applicant must furnish additional information, as needed, to determine the regulatory flood protection elevation and whether the proposed use would fall within the Floodway or Flood Fringe District. Information must be consistent with accepted hydrological and hydraulic engineering standards and the standards in subsection B3 of this section.
3. The determination of floodway and flood fringe must include the following components, as applicable:
a. Estimate the peak discharge of the regional, one percent (1%) chance, flood.
b. Calculate the water surface profile of the regional flood based upon a hydraulic analysis of the stream channel and overbank areas.
c. Compute the floodway necessary to convey or store the regional flood without increasing flood stages more than one-half (0.5) foot. A stage increase of less than 0.5 foot is required if, as a result of the stage increase, increased flood damages would result. An equal degree of encroachment on both sides of the stream within the reach must be assumed in computing floodway boundaries.
4. The Zoning Administrator will review the submitted information and assess the technical evaluation and the recommended Floodway and/or Flood Fringe District boundary. The assessment must include the cumulative effects of previous floodway encroachments. The Zoning Administrator may seek technical assistance from a designated engineer or other expert person or agency, including the Department of Natural Resources. Based on this assessment, the Zoning Administrator may approve or deny the application.
5. Once the Floodway and Flood Fringe District boundaries have been determined, the Zoning Administrator, must process the permit application consistent with the applicable provisions of sections 11.54 and 11.55 of this chapter. (Ord. 10, 7th Series, eff. 7-2-2018)