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HomeMy WebLinkAbout1992-3440 Specific standards for flood conditions ORDINANCE NO. 3440 AN ORDINANCE related to buildings, providing minimum standards to minimize losses due to flood conditions; amending Section 11.58.150 of the City of Yakima Municipal Code. BE IT ORDAINED BY THE CITY OF YAKIMA: Section 1. Section 11.58.150 of the City of Yakima Municipal Code is hereby amended to read as follows: "11.58.150 Specific standards. In all areas of special flood hazards where base flood evaluation data has been provided as set forth in Section 11.58.050 or Section 11.58.120, the following provisions are required: 1. Residential Construction. (1) New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated one foot or more above base flood elevation. (2) Fully enclosed areas below the 111 lowest floor that are subject to flooding are prohibited, or shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. De- signs for meeting this requirement must either be certified by a registered pro- fessional engineer or architect or must meet or exceed the following minimum criteria: (a) A minimum of two open- ings having a total net area of not less than one square inch for every square foot of en- closed area subject to flooding shall be provided. (b) The bottom of all openings shall be no higher than one foot above grade. (c) Openings may be equip- ped with screens, louvers, or other coverings or devices; provided, that they permit the automatic entry and exit of floodwaters. 1 - (ord /flood.sc) fr 4 . 7 2. Nonresidenti'al Construction. (1) New construction and substantial improvement of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including basement, elevated one foot or more above the level of the base flood elevation; or, together with attendant utility and sani- tary facilities, shall: (a) Be floodproofed so that below one foot the base flood level the structure is watertight with walls substan- tially impermeable to the pas- sage of water; (b) Have structural compo- nents capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and (c) Be certified by a registered professional engineer or architect that the design and methods of construction are in accordance with accepted stan- dards of practice for meeting provisions of this subsection based on their development and /or review of the structural design, specifications, and 410 plans. Such certifications shall be provided to the offi- cial as set forth in Section 11.58.120 3(2). (2) Nonresidential structures that are elevated, not floodproofed, must meet the same standards for space below the lowest floor as described in Subsection 1(2) of this section. (3) Applicants floodproofing nonresi- dential buildings shall be notified that flood insurance premiums will be based on rates that are one foot below the flood - proofed level (e.g. a building constructed to one foot above the base flood level will be rated at the base flood level). 3. Critical Facility. (1) Construction of new critical facilities shall be, to the extent possi- ble, located outside the limits of the base flood plain. Construction of new - 2 - (ord /flood.sc) S{J critical facilities sh all be permissible within the base flood plain if no feasible alternative site is available. Critical 4111 , facilities constructed within the base flood plain shall have the lowest floor elevated to three. feet or more above the level of the base flood elevation at the site. Floodproofing and sealing measures must be taken to ensure that toxic sub- stances will not be. displaced by or re- leased into flood waters. Access routes elevated to or above the level of the base flood plain shall be provided to all critical facilities to the extent possi ble. 4. Manufactured Homes. (1) .Manufactured homes to be placed or substantially improved within Zones A1-30, AH, and AE on the community's FIRM shall be elevated on a permanent founda- tion such that the lowest floor of the manufactured home is one foot or more above the base flood elevation; and be securely anchored to an adequately an- chored foundation system in accordance with the provisions of Section 4.58.140 1." 410 Section 2. This ordinance shall be in full force and effect 30 days after its passage, approval, and publication as provided by law and by the City Charter. PASSED BY THE CITY COUNCIL, signed. and approved this i7 day of Hared 1992. G5 ( 6€4_,,,,j,----- • Mayor ATTEST: K City Clerk Publication Date: Mc rk Zv, t99z- Ef f ective Date: t 2[2, t99z - 3 - (ord /flood.sc)