Ordinance No. 20224 - Laserfiche WebLink

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grade. c. Openings may be equipped with screens, louvers, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters. (b) Nonresidential construction. New construction and substantial improvement of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including basement, elevated to the level of the base flood elevation; or, together with attendant utility and sanitary facilities, shall: 1. Be flood proofed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water; 2. Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; 3. Be certified by a registered professional engineer or architect that the design and methods of construction are in accordance with accepted standards of practice for meeting provisions of this subsection based on their development and/or review of the structural design, specifications and plans. Such certifications shall be provided to the building official as required in section 9.6707. 4. Nonresidential structures that are elevated, not floodproofed, must meet the same standards for space below the lowest floor as described in subparagraph (2)(a )2. of this section. 5. Applicants floodproofing nonresidential buildings shall be notified that flood insurance premiums will be based on rates that are one foot below the floodproofed level (e.g. a building constructed to the base flood level will be rated as one foot below that level). (c) Manufactured homes. All manufactured homes to be- placed or substantially improved within -Zones Al -30, AH, and AE shall be elevated on a permanent foundation such that the lowest floor of the manufactured home is at or above the base flood elevation and be securely anchored to an adequately anchored foundation system in accordance with the provisions of subsection (1)(a)2 of this section. (d) Floodways. Within areas of special flood hazard established in section 9.6706 are areas designated as floodways. Since a floodway is an extremely hazardous area due to the velocity of flood waters which carry debris, potential projectiles, and erosion potential, the following provisions apply: . 1. Prohibition on encroachments, including fill, new construction, substantial improvements, and other development unless certification by a registered professional engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge; and Ordinance - 258