New construction, alterations and substantial improvements of residential dwellings, including manufactured homes and recreational vehicles on site for more than 180 consecutive days, must be constructed such that:
(A) The lowest floor elevation (including basement) including electrical, heating, duct work, ventilation, plumbing and air conditioning equipment and other services is two feet above the base flood elevation. Elevating may be by either suitable fill, stem walls, pilings or other acceptable means;
(B) Crawl spaces must be designed so that the crawl space floor is at or above the base flood elevation. Crawl spaces having an inside dimension of more than five feet from the ground to the living floor level must meet the requirements in this section for a basement;
(C) Where existing streets, utilities, lot dimensions or additions onto existing structures make strict compliance with these provisions impossible, a lesser amount of fill or alternative flood-proofing measures may be permitted only by variance approval; and
(D) All manufactured homes for residential use shall:
(1) Use methods and practices which minimize flood damage;
(2) Elevate the lowest floor two feet above the base flood elevation;
(3) Elevate on suitable fill or be raised on a permanent foundation;
(4) Have a foundation consisting of reinforced concrete, reinforced-mortared block, reinforced piers or other foundation elements of equal strength; and
(5) Secure the chassis, including additions by anchoring to the foundation system so that it will resist flotation, collapse or lateral movement. Anchoring may include, but are not limited to:
(a) Over-the-top ties to ground anchors be provided at each of the four corners of the mobile home, with two additional ties per side at intermediate locations for manufactured homes less than 50 feet long;
(b) Frame ties to ground anchors be provided at each corner of the home with five additional ties per side at intermediate points, for manufactured homes more than 50 feet long; and
(c) Components of the anchoring system capable of carrying a force of 4,800 pounds.
(6) Adequate surface drainage and access for a hauler.
(Ord. 2013-01, passed 1-30-2013)
Federal law reference:
Manufactured homes, see 44 C.F.R. § 60.3(c)(6) and (c)(12)
Statutory reference:
Flood-proofing for residential structures, see ARM 36.15.702(a)