A. General Standards: In all areas of special flood hazard, the following standards are required:
1. Anchoring:
a. All new construction and substantial improvements shall be anchored to prevent flotation, collapse, or lateral movement of the structure and capable of resisting the hydrostatic and hydrodynamic loads.
b. All manufactured homes must be elevated and anchored to resist flotation, collapse or lateral movement and capable of resisting the hydrostatic and hydrodynamic loads. Methods of anchoring may include, but are not limited to, use of over the top or frame ties to ground anchors. This requirement is in addition to applicable state and local anchoring requirements for resisting wind forces. Specific requirements may be:
(1) Over the top ties be provided at each of the four (4) corners of the manufactured home, with two (2) additional ties per side at intermediate locations, with manufactured homes less than fifty feet (50') long requiring one additional tie per side;
(2) Frame ties be provided at each corner of the home with five (5) additional ties per side at intermediate points, with manufactured homes less than fifty feet (50') long requiring four (4) additional ties per side;
(3) All components of the anchoring system be capable of carrying a force of four thousand eight hundred (4,800) pounds; and
(4) Any additions to the manufactured home be similarly anchored.
2. Construction Materials And Methods:
a. All new construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage.
b. All new construction and substantial improvements shall be constructed using methods and practices that minimize flood damage.
c. All new construction and substantial improvements shall be constructed with electrical, heating, ventilation, plumbing, and air conditioning equipment and other service facilities that are designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding.
3. Utilities:
a. All new replacement water supply systems shall be designed to minimize or eliminate infiltration of floodwaters into the system;
b. New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the systems and discharge from the systems into floodwaters; and
c. On site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
4. Subdivision Proposals:
a. All subdivision proposals shall be consistent with the need to minimize flood damage;
b. All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical, and water systems located and constructed to minimize flood damage;
c. All subdivision proposals shall have adequate drainage provided to reduce exposure to flood damage; and
d. Base flood elevation data shall be provided for subdivision proposals and other proposed development which contain at least fifty (50) lots or five (5) acres, whichever is less.
5. Encroachments: Encroachments, including fill, new construction, substantial improvements, and other development shall be prohibited in any floodway unless a technical evaluation demonstrates that the encroachments will not result in any increase in flood levels during the occurrence of the base flood discharge.
B. Specific Standards: In all areas of special flood hazard where base flood evaluation data has been provided as set forth in subsection 11-1-9B2 of this chapter, the following standards are required:
1. Residential Construction: New construction and substantial improvements of any residential structure shall have the lowest floor (including basement) elevated to or above the base flood elevation.
2. 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:
a. Be floodproofed so that below 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 (Ord. 89-03-30/4, 5-1-1989)
c. Be certified by a registered professional engineer or architect in the state of Wyoming that the design and methods of construction are in accordance with accepted standard of practice for meeting the provisions of this section. Such certifications shall be provided to the official as set forth in subsection 11-1-7B3b of this chapter. (Ord. 09-26-013, 10-1-2013)
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