4/19/2023 0 Comments Flood zone![]() ![]() "Existing manufactured home park or manufactured home subdivision" means a parcel (or contiguous parcels) of land divided into two or more manufactured home lots for rent or sale for which the construction of facilities for servicing the lot on which the manufactured home is to be affixed (including as a minimum, the installation of utilities, either final site grading or the pouring of concrete pads, and the construction of streets) is completed before the original date of this Chapter. "Development" means any man‑made change to improved or unimproved real estate, including but not limited to buildings, bridges, other structures, and mining, dredging, filling, grading, paving, excavation, fencing, landscaping, drainage facilities, drilling operations, or storage of equipment or material. To convert NAVD 1988 level to City datum, subtract 2.125 feet from the elevation referenced to NAVD 1988 level. The FIRM maps described in Section 24.50.050 are referenced to the North American Vertical Datum (NAVD) of 1988. "City Datum" means the reference datum for the City of Portland maps. “Basement” means any area of the building having its floor subgrade (below ground level) on all sides.į. Designation on maps always includes the letters A or V.Į. "Base Flood (100‑year flood)" means the flood having 1 percent chance of being equaled or exceeded in any given year. Designation on maps always includes the letters A or V.ĭ. "Areas of Special Flood Hazard" mean the land in the flood plain within a community subject to a one percent or greater chance of flooding in any given year. AO is characterized as sheet flow and AH indicates ponding.Ĭ. The base flood depths range from 1 to 3 feet a clearly defined channel does not exist the path of flooding is unpredictable and indeterminate and, velocity flow may be evident. "Area of shallow flooding" means a designated AO or AH zone on the Flood Insurance Rate Map (FIRM). "Appeal" means a request for a review of the City of Portland’s interpretation of any provision of this ordinance or a request for a variance.ī. 178741, 182335, effective November 26, 2010.) The definitions contained in this Section relate to flood hazard areas and considerations outlined in this Chapter.Ī. The City of Portland or any officer or employee thereof, or the Federal Insurance Administration shall not be liable for any flood damages that result from reliance on the provisions or designations of this Chapter or any administrative decision lawfully made thereunder. The identification of designated flood hazard areas does not imply that lands outside of such areas will be free from flooding or flood damage. Areas within designated drainage districts and those areas not covered by adequate topographic maps may contain unmapped watercourses subject to flooding. Greater flood heights and more extensive floodway fringe areas associated with longer flood frequency occurrences may occur or the flood height and extent of flooding may be increased by human or natural causes, such as log jams, bridge openings restricted by debris, or changes in basin conditions. If an inconsistency exists between Chapter 24.50 and other titles of this Code, the more restrictive uses or requirements shall prevail.Ĭ. A structure or the use of a structure or property which was lawful before the original date of this Chapter but which is not in conformity with the provisions of this Chapter may be continued subject to provisions of the State Building Code, regulations for existing structures.ĭ. The flood protection elevations and the floodway and floodway fringe areas specified by this Chapter, based on the 100‑year flood elevations, are considered reasonable. Land classified in a flood hazard area may restrict or affect uses and development permitted in one or more of the regular zones listed in Chapter 33.16. ![]() 182370, effective November 26, 2008.)Ī. The provisions of this Chapter shall regulate development and construction in flood hazard areas identified in Section 24.50.030.ī. ![]()
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