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Ordinance No. 2239 Page 6 of 6 floodplain administrator, Upon the completion of the structure, the elevation of the lowest floor, including basement, shall be certified by a registered professional engineer or surveyor, or verified by the community building inspector to be properly elevated. Such certification or verification shall be provided to the floodplain administrator. 3. Nonresidential new construction or substantial improvements shall either be elevated in conformance with subsection (C)(1) or (C)(2) or together with attendant utility and sanitary facilities: a. Be floodproofed so that below one (1) foot above the base flood elevation the structure is watertight with walls substantially impermeable to the passage of water; b. Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and C. Be certified by a registered professional engineer or architect that the standards of this subsection are satisfied. Such certifications shall be provided to the floodplain administrator. 4. Require, for all new construction and substantial improvements, that fully enclosed areas below the lowest floor that are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or meet or exceed the following minimum criteria: a. Either a minimum of two (2) openings having a total net area of not less than one (1) square inch for every square foot of enclosed area subject to flooding shall be provided. The bottom of all openings shall be no higher than one (1) foot above grade. Openings may be equipped with screens, louvers, valves or other coverings or devices provided that they permit the automatic entry and exit of floodwaters; or b. Be certified to comply with a local floodproofing standard approved by the Federal Insurance Administration. 5. Manufactured homes shall also meet the standards in Section 17.08.180. 17.08.180 Standards—Manufactured homes. All new and substantially improved and/or substantially damaged manufactured homes and additions to manufactured homes shall: A. Be elevated so that the lowest floor is at or above one (1) foot higher than the base flood elevation; and B. Be securely anchored to a permanent foundation system to resist flotation, collapse or lateral movement. 18.08.540 Structure, accessory Class I. "Class I accessory structure" means a subordinate structure, the use of which is appropriate, subordinate, and customarily incidental to that of the main structure or the main use of the land, and which is located on the same site with the main structure or use. "Class I accessory structures" shall include those accessory structures designed for possible habitation and include covered patios, garages and carports, any covered or enclosed area with a height greater than six feet or an area greater than 80 square feet. 18.08.545 Structure, accessory Class II. "Class II accessory structure" means a subordinate structure, the use of which is appropriate, subordinate and customarily incidental to that of the main structure or Class I accessory structure, or the main use of the land, and which is located on the same site with the main structure or use. Class II accessory structures shall include those accessory structures not designed for habitation, and include plant shelters and lathe area and tool storage sheds with a height no greater than six feet or an area no greater than 80 square feet. Delete Article III. Conditional Use Permits for Large Family Day Care Homes, §§18.24.330 - 18.124.380, inclusive.