Ordinance No. 20224 - Laserfiche WebLink

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2. If the conditions of subparagraph 1. above are met, all new - construction and substantial improvements shall comply with all other applicable flood hazard reduction provisions of this section. (e) Shallow flooding areas - with depth designations Shallow flooding zones appear on Flood Insurance Rate Maps (FIRM), with depth designations, wherever such flooding occurs on sloping water surfaces such as alluvial fan flow, wave wash after the wave has broken, etc. In these areas, the following provisions apply: 1. New construction and substantial improvements of residential structures within these zones shall have the lowest floor ('including basement) elevated above the highest adjacent grade of the building site, to at least one foot above the depth number specified on the FIRM. where appropriate, such structures shall be elevated above the crown of the nearest road, to at least one foot above the depth number specified in the FIRM. where hazardous velocities are noted on the FIRM, consideration shall be given to mitigating the effects of these velocities through proper construction techniques and methods. 2. New construction and substantial improvements of nonresidential structures within these zones shall either: a. Have the lowest floor (including basement) elevated above the highest adjacent grade of the building site to at least one foot above the depth number specified on the FIRM; or b. Together with attendant utility and sanitary facilities, be completely floodproofed to at least one foot above that level so that any space below that level is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. If this method is used, compliance shall be certified by a registered professional engineer or architect. Where hazardous velocities are noted on the FIRM, consideration shall be given to mitigating the effects of these velocities through proper construction techniques and methods. 9.6710 - Geotechnical Analvsis. (1) Purpose of Geotechnical Analysis. The purpose of a geotechnical analysis is to ensure that public and private facilities in developments in areas of known or potential unstable soil conditions are located, designed, and constructed in a manner which provides for public health, safety, and welfare. ( Geotechnical Analysis Required. Except for those activities exempted under EC 9.6710(3) Exemptions from Geotechnical Requirements, a geotechnical analysis, prepared by an Oregon licensed Engineering Geologist or an Oregon licensed Civil Engineer with geotechnical experience, conforming with Ordinance - 259