CHAPTER 5

PROVISIONS FOR FLOOD HAZARD REDUCTION

SECTION:

12-5-1:		General Standards
12-5-2:		Specific Standards
12-5-3:		Floodways !2R!

12-5-1:		GENERAL STANDARDS:

In all areas of special flood hazard, the following standards are required:

A.	Anchoring:

1.	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.

2.	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:

a.	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.

b.	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;

c.	All components of the anchoring system be capable of carrying a force of four thousand eight hundred (4,800) pounds; and

d.	Any additions to the manufactured home be similarly anchored.

B.	Construction Materials And Methods:

1.	All new construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage.

2.	All new construction and substantial improvements shall be constructed using methods and practices that minimize flood damage. (Ord. 3-9-89, 3-9-1989)

3.	All new construction and substantial improvements with electrical, heating, ventilation, plumbing, and air conditioning equipment and other service facilities shall be designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding. (Res. 3-9-89, 3-9-1989)

C.	Utilities:
1.	All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of floodwaters into the system;

2.	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

3.	On site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.

D.	Subdivision Proposals:

1.	All subdivision proposals shall be consistent with the need to minimize flood damage;

2.	All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage;

3.	All subdivision proposals shall have adequate drainage provided to reduce exposure to flood damage; and

4.	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). (Ord. 3-9-89, 3-9-1989)

12-5-2:		SPECIFIC STANDARDS:

In all areas of special flood hazard where base flood elevation data been provided as set forth in section 12-3-2 or subsection 12-4-3B of this title, the following provisions are required:

A.	Residential Construction: New construction and substantial improvement of any residential structure shall have the lowest floor (including basement) elevated to or above the base flood elevation.

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 floodproofed so that below the base flood elevation 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; and

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 the provisions of this subsection. Such certifications shall be provided to the official as set forth in section 12-4-3C2 of this title.

C.	Manufactured Homes:

1.	Manufactured homes shall be anchored in accordance with subsection 12-5-1A2 of this chapter. (Ord. 3-9-89, 3-9-1989)
2.	All manufactured homes or those to be substantially improved 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 is securely anchored to an adequately anchored foundation system in accordance with the provisions of subsection 12-5-1A2 of this chapter. This subsection applies to manufactured homes to be placed or substantially improved in an expansion to an existing manufactured home park or subdivision. This subsection does not apply to manufactured homes to be placed or substantially improved in an existing manufactured home park or subdivision except where the repair, reconstruction or improvement of the streets, utilities and pads equals or exceeds fifty percent (50%) of the value of the streets, utilities and pads before the repair, reconstruction or improvement has commenced. (Res. 3-9-89, 3-9-1989)

12-5-3:		FLOODWAYS:

Located within areas of special flood hazard established in section 12-3-2 of this title are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles and erosion potential, the following provisions apply:

A.	Prohibit 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.

B.	If subsection A of this section is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of this chapter. (Ord. 3-9-89, 3-9-1989)