(A) Purpose. The F-2 Floodplain Overlay Zone is intended to regulate the nature of permitted development in the 100-year floodplain as identified by the Federal Insurance Administration of the National Flood Insurance Program of the U.S. Department of Housing and Urban Development and shown as “A” Zones on the city’s Flood Insurance Rate Maps, so as to lessen property damage and hazards resulting from such events.
(B) Principally permitted uses. Those principally permitted uses of the underlying zoning district, which may be any of the residential, commercial, or industrial zones defined in this chapter, provided, however, that the uses comply with the restrictions of divisions (E) and (F) of this section, below.
(C) Conditionally permitted uses. Those conditionally permitted uses of the underlying zoning district, which may be any of the residential, commercial, or industrial zones defined in this chapter, provided, however, that such uses comply with the restrictions of divisions (E) and (F) of this section, below.
(D) Permitted accessory uses. Those permitted accessory uses of the underlying zoning district, which may be any of the residential, commercial, or industrial zones defined in this chapter, provided, however, that such uses comply with the restrictions of divisions (E) and (F) of this section, below.
(E) General standards for flood hazard reduction. In all floodway and floodplain areas, the following standards are required.
(1) Anchoring.
(a) All new construction and substantial improvements shall be anchored to prevent floatation, collapse, or lateral movement of the structure.
(b) All existing mobile homes shall be anchored to resist floatation, collapse, or lateral movement by providing over-the-top and frame ties to ground anchors. Special requirements shall be that:
1. Over-the-top ties be provided at each of the four corners of the mobile home, with two additional ties per side at intermediate locations; mobile homes less than 50 feet long require only one additional tie per side;
2. Frame ties be provided at each corner of the mobile home with five additional ties per side at intermediate points with mobile homes less than 50 feet requiring only four additional ties per side;
3. All components of the anchoring system are capable of carrying a force of 4,800 pounds; and
4. Any additions to the mobile home be similarly anchored.
(2) Utilities.
(a) All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system;
(b) New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharge from the systems into flood waters; and
(c) On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
(F) Specific standards for flood hazard reduction. The following standards shall apply in all areas where base flood elevation data has been established by the Federal Insurance Administrator of the National Flood insurance Program of the U.S. Department of Housing and Urban Development.
(1) Residential construction.
(a) New construction and substantial improvement of any residential structure shall have the lowest finished flood elevation, including basement, at least one foot above the base flood elevation.
(b) New construction and substantial improvement of any residential structure located in an AO zone as specified on the community’s Flood Insurance Rate Map (FIRM) shall have the lowest floor, including basement, elevated above the crown of the nearest street or to the depth number specified in the community’s FIRM.
(2) Non-residential construction.
(a) New construction and substantial improvement of any commercial, industrial, or other non-residential structure shall either have the lowest floor, including basement, elevated to one foot above the base flood elevation; or, together with attendant utility and sanitary facilities, shall:
1. Be flood proofed so that below one foot above the base flood level 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 standards of this subsection are satisfied. The certifications shall be provided to the Building Department and the Maricopa County Flood Control District.
(b) New construction and substantial improvement of any non-residential structure located in an AO zone as specified on the community’s FIRM shall have the lowest floor, including basement, elevated above the crown of the nearest street or to the depth number specified on the community’s FIRM or together with attendant utility and sanitary facilities shall:
1. Be flood proofed so that below the base flood level 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 that the standards of this division are satisfied. The certifications shall be provided to the Building Department and the Maricopa County Flood Control District.
(3) Mobile homes.
(a) Existing mobile homes shall be anchored in accordance with division (E)(1) of this section, above.
(b) No mobile homes shall be placed in any floodway or floodplain after the effective date of this chapter.
(Res. R22-05-08, passed 5-3-2022; Ord. O22-05-02, passed 5-3-2022)