10-11-21 Regular Meeting - Laserfiche WebLink

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(6)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; and, (7) On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding. (8) Require within all zones adequate drainage paths around structures on slopes to guide flood waters around and away from proposed structures. (9) Compensating floodplain mitigation will be required for any fill placed below theriverine base flood elevation and/or riverine 500-year floodplain elevation for any new construction or substantial improvements, including fill placed in a Coastal AE zone that is below the riverine 100-or 500-year water surface elevations. Sec. 94-87. -Specific standards. In all areas of special flood hazards and moderate flood hazards where base flood elevation and/or riverine 500-year floodplain elevation data has been provided as set forth in (i) section 94-38, (ii) subsection 94-62(8), or (iii) subsection 94-88(3), the following provisions are required: (1) Residential construction. New construction and substantial improvement of any residential structure shall have the lowest floor (including basement), elevated at least one foot above the base flood elevation or at or above the riverine 500-year floodplain elevation, whichever is higher. A registered professional engineer, architect, or land surveyor shall submit a certification to the floodplain administrator that the standard of this subsection as proposed in section 94-64(1)(a), is satisfied. (2) Nonresidential construction. New construction and substantial improvements of any commercial, industrial or other nonresidential structure shall either have the lowest floor (including basement) elevated to or above the base flood elevation or at or above the riverine 500-year floodplain elevation, whichever is higher, or together with attendant utility and sanitary facilities, be designed so that below the base flood elevation or the riverine 500-year floodplain elevation, whichever is higher; the structure 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. A registered professional engineer or architect shall develop and/or review structural design, specifications, and plans for the construction, and shall certify that the design and methods of construction are in accordance with accepted standards of practice as outlined in this subsection. A record of such certification which includes the specific elevation (in relation to mean sea level) to which such structures are floodproofed shall be maintained by the floodplain administrator. (3) Enclosures. New construction and substantial improvements, with fully enclosed areas below the lowest floor that are usable solely for parking of vehicles, 13