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In all areas of special flood hazards, the following provisions are required for all new construction and substantial improvements:
(a) All new construction or substantial improvements shall be designed (or modified) and adequately anchored to prevent flotation, collapse, or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy;
(b) All new construction or substantial improvements shall be constructed by methods and practices that minimize flood damage;
(c) All new construction or substantial improvements shall be constructed with materials resistant to flood damage;
(d) New and replacement electrical equipment, heating, ventilating, air conditioning, plumbing connections, and other service equipment shall be located at least two feet above the base flood elevation. Electrical wiring and outlets, switches, junction boxes, and panels shall be elevated at least two feet above the base flood elevation unless they conform to the provisions of the electrical code for location of such items in wet locations. Duct systems shall not be installed below two feet above the base flood elevation;
(e) All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system;
(f) New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the system and discharge from the systems into flood waters;
(g) On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding;
(h) The flood protection elevation (FPE) shall be the base flood elevation plus two feet;
(i) Where base flood elevation and floodway data have not been provided in special flood hazard areas, the floodplain administrator shall obtain, review, and reasonably utilize any base flood elevation and floodway data available from a federal, state, or other source; and
(j) Protected area.
(1) The protected area is comprised of those lands that lie within the boundaries of the floodway and the channel migration area.
(2) In riverine areas where a floodway has not been designated in accordance with this chapter, the protected area is comprised of those lands that lie within the boundaries of the channel migration area and the SFHA;
(3) Channel migration area.
A. The channel migration area shall be the channel migration zone as delineated on Sioux Falls Floodplain Protection Area Map plus 25 feet.
B. Where more than one channel migration zone has been delineated, the floodplain administrator shall use the delineation that has been adopted for other local regulatory purposes.
C. Where a channel migration zone has not yet been mapped, it is designated as the entire SFHA as the channel migration zone.
(1992 Code, § 45-19) (Ord. 70-09, passed 8-3-2009; Ord. 94-16, passed 8-2-2016; Ord. 77-21, passed 7-6-2021)