Standards: The following standards shall apply to all uses and development within the regulatory floodway:
A. New Development Or Substantial Improvements: New development or substantial improvements are not allowed within a regulatory floodway. Provided, however, if encroachment is unavoidable, the new construction or substantial improvement of residential, commercial, or industrial uses are not allowed in the regulatory floodway. If site work encroachment is unavoidable, a Hydraulic & Hydrology Analysis with No-Rise Certification as detailed in subsection 8-3F-6D4b of this article shall be provided by a professional engineer licensed in the state of Idaho demonstrating that the encroachment will not result in any increase in base flood levels (BFE) during the occurrence of the base flood discharge.
B. Letter Of Map Change (LOMC): If a change or revision of a FIRM is warranted by any of the specific standards identified in this article, the applicant and/or owner shall submit a request to FEMA for an LOMC. The applicant and/or owner may submit the request to FEMA online themselves or retain a professional engineer licensed in the state of Idaho to prepare and submit the amendment and/or revision request to FEMA. A copy of the official amendment and/or revision letter signed by FEMA shall be submitted to the floodplain administrator prior to issuance of a building permit.
C. Hydraulic and Hydrology Analysis with No-Rise Certification: If no rise certification for site work encroachment is provided and approved, pursuant to subsection A.1 of this section, all work shall comply with the applicable standards for uses in the flood fringe detailed in sections 8-3F-8-2 through 8-3F-8-4, inclusive, of this article.
D. Uses In A Foothill Or Hillside Tributary: In addition to the standards above, uses proposed in a foothill or other hillside tributary floodplain as determined by the Ada County engineer shall also meet the standards set forth in section 8-3F-8-6 of this article.
E. Pit, Mine Or Quarry: Pit, mine or quarry operations are prohibited within the floodway. (Ord. 835, 12-3-2014; Ord. 914, 6-10-2020)