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In all SFHAs where base flood elevation data has been provided as set forth in sections 70-6, 70-21(f), or 70-36 of this Code, the following provisions are required:

(1) Residential construction. New construction and Substantial Improvement of any residential structure shall have the lowest floor (including basement or crawl space), electrical, heating, ventilation, plumbing, and air conditioning equipment and other service facilities (including ductwork), elevated to two feet above the base flood elevation. Upon completion of the structure, the elevation of the lowest floor, including basement or crawl space, shall be certified by a licensed Colorado Professional Engineer, architect, or land surveyor. Such certification shall be submitted to the floodplain administrator, prior to issuance of a certificate of occupancy.

a. All new subdivisions shall be constructed so the lowest point on any lot shall be located one foot above base flood elevation.

b. Manufactured home standards are governed by subsection (4) of this section and not by the standards in subsection (1) of this section.

(2) Nonresidential construction. With the exception of critical facilities, outlined in section 70-37 of this Code, new construction and substantial improvements of any commercial, industrial, or other nonresidential structure shall either have the lowest floor (including basement or crawl space), electrical, heating, ventilation, plumbing, and air conditioning equipment and other service facilities (including ductwork), elevated to one foot above the base flood elevation or, together with attendant utility and sanitary facilities, be designed so at one foot above the base flood elevation 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 licensed Colorado Professional Engineer or architect shall develop and/or review structural design, specifications, and plans for the construction, and shall certify the design and methods of construction are in accordance with accepted standards of practice as outlined in this subsection. Such certification shall be provided to the floodplain administrator prior to issuance of a certificate of occupancy.

(3) Enclosures. New construction and substantial improvements, with fully enclosed areas below the lowest floor that are usable solely for parking of vehicles, building access, or storage in an area other than a basement and which 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 licensed Colorado Professional Engineer or architect or meet or exceed the following minimum criteria:

a. A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed 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 equipped with screens, louvers, valves, or other coverings or devices provided they permit the automatic entry and exit of floodwaters.

(4) Manufactured homes. All manufactured homes placed or substantially improved within zones A, AO, AH, and AE as designated on the City's FIRM on sites outside of a manufactured home park or subdivision, in a new manufactured home park or subdivision, in an expansion to an existing manufactured home park or subdivision, or in an existing manufactured home park or subdivision on which a manufactured home has incurred substantial damage as a result of a flood or other causes, shall be elevated on a permanent foundation so the lowest floor of the manufactured home, electrical, heating, ventilation, plumbing, and air conditioning equipment and other service facilities (including ductwork) are elevated to two feet above the base flood elevation and be securely anchored to an adequately anchored foundation system to resist flotation, collapse, and lateral movement.

a. All manufactured homes placed or substantially improved on sites in an existing manufactured home park or subdivision within zones A, AO, AH, and AE as designated on the City's FIRM that are not subject to the provisions of the above paragraph shall be elevated so either:

i. The lowest floor of the manufactured home, electrical, heating, ventilation, plumbing, and air conditioning equipment and other services(including ductwork) are two feet above the base flood elevation; or

ii. The manufactured home chassis is supported by reinforced piers or other foundation elements of at least equivalent strength that are no less than 36 inches in height above grade and be securely anchored to an adequately anchored foundation system to resist flotation, collapse, and lateral movement.

b. Methods of anchoring may include, but are not limited to, use of over-the-top and frame ties to ground anchors. This requirement is in addition to applicable state and local anchoring requirements for resisting wind forces. Specific requirements shall be:

i. Over-the-top ties be provided at each of the four corners of the manufactured home, with two additional ties per side at intermediate locations, with manufactured homes greater than 50 feet long require one additional tie per side;

ii. Frame ties be provided at each corner of the home with five additional ties per side at intermediate points, with manufactured homes greater than 50 feet long require four additional ties per side;

iii. All components of the anchoring system be capable of carrying a force of 4,800 pounds; and

iv. Any additions to the manufactured home shall be appropriately anchored.

(5) Recreational vehicles.

a. All recreational vehicles placed on sites within zones A, AH, and AE as designated on the City's FIRM shall either:

i. Be on the site for fewer than 180 consecutive days;

ii. Be fully licensed and ready for highway use; or

iii. Meet the permit requirements of division 5 of this article and the elevation and anchoring requirements for manufactured homes of this section.

b. A recreational vehicle is ready for highway use if it is on its wheels or jacking devices, and has no permanently attached additions.