18.48.130 Floodways.
Located within areas of special flood hazard are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles, and erosion potential, the following provisions apply:
(1) Prohibit encroachments, including fill, new construction, substantial improvements, and other development, unless certification by a registered professional civil engineer is provided demonstrating through hydrologic and hydraulic analyses per-formed in accordance with standard engineering practice that encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge.
(2) If subsection (1) of this section is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of NBCC 18.48.060 through 18.48.100.
(3) New installations of manufactured homes are prohibited. Manufactured homes may only be located in floodways according to one of the following conditions:
(a) If the manufactured home already exists in the floodway, the placement was permitted at the time of the original installation, and the continued use is not a threat to life, health, property, or the general welfare of the public; or
(b) A new manufactured home is replacing an existing manufactured home whose original placement was permitted at the time of installation and the replacement home will not be a threat to life, health, property, or the general welfare of the public, and it meets the following criteria:
(i) It must be demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practices that the manufactured home and any accessory buildings, accessory structures, or any property improvements will not result in any increase in flood levels during the occurrence of the base flood discharge;
(ii) The replacement manufactured home and any accessory buildings or accessory structures shall have the finished floor elevated a minimum of 18 inches above the base flood elevation as identified on the flood insurance rate map;
(iii) The replacement manufactured home is placed and secured to a foundation support system designed by an Oregon professional engineer or architect and approved by the building official;
(iv) The replacement manufactured home, its foundation supports, and any accessory buildings, accessory structures, or property improvements do not displace water to the degree that it causes a rise in the water level or diverts water in a manner that causes erosion or damage to other properties;
(v) The location of a replacement manufactured home is authorized by this title; and
(vi) Any other requirements deemed necessary by the city of North Bend. (Ord. 2027 § 1, 2018)