CHAPTER 6
FLOODPLAIN MANAGEMENT
ARTICLE 8. FLOOD RESISTANT DEVELOPMENT
SECTION:
§9650: Subdivisions, In Addition
§9651: Site Improvement, In Addition
§9652: Limitations On Placement Of Fill
§9653: Manufactured Homes – Installation, In Addition
§9654: Elevation Requirement For Certain Existing Manufactured Home Parks And Subdivisions
§9655: Detached Garages And Accessory Storage Structures
§9656: Flood Control Projects; General
§9657: Flood Control Projects; Application
§9650 SUBDIVISIONS, IN ADDITION
In addition to the subdivision provisions in Appendix G, the following requirements apply:
A. In Zones AH and AO, adequate drainage paths shall be provided to guide floodwater around and away from proposed structures.
B. When fill will be placed to support buildings, the fill shall be placed in accordance with the Building Code and approval of the subdivision shall require submission of as-built elevations for each filled pad certified by a licensed land surveyor or registered civil engineer. (Ord. 1259, §9, adopted 2025)
§9651 SITE IMPROVEMENT, IN ADDITION
In addition to the site improvement provisions in Appendix G, the requirements of this Article shall apply. (Ord. 1259, §9, adopted 2025)
§9652 LIMITATIONS ON PLACEMENT OF FILL
Where the placement of fill is permitted by the Building Code, Appendix G, or these Regulations, fill shall be designed to be stable under conditions of flooding including rapid rise and rapid drawdown of floodwaters, prolonged inundation, and protection against flood-related erosion and scour. In addition to these requirements, when intended to support buildings and structures, fill shall comply with the requirements of the building code. The placement of fill intended to change base flood elevations, change floodway boundaries, or change boundaries of flood hazard areas shown on FIRMs shall be subject to the requirements of Section 9631 of these Regulations. (Ord. 1259, §9, adopted 2025)
§9653 MANUFACTURED HOMES – INSTALLATION, IN ADDITION
In addition to the provisions for manufactured homes in Appendix G:
A. All manufactured homes installed in flood hazard areas shall be installed by an installer that is licensed pursuant to the Business and Professions Code and shall comply with the requirements of the Department of Housing and Community Development (HCD) and the requirements of these Regulations.
B. In addition to permits pursuant to Appendix G, permits from the HCD are required where the HCD is the enforcement agency for installation of manufactured homes.
C. Upon completion of installation and prior to the final inspection by the Floodplain Administrator, the installer shall submit certification of the elevation of the manufactured home, prepared by a licensed land surveyor or registered civil engineer, to the Floodplain Administrator. (Ord. 1259, §9, adopted 2025)
§9654 ELEVATION REQUIREMENT FOR CERTAIN EXISTING MANUFACTURED HOME PARKS AND SUBDIVISIONS
Manufactured homes that are placed, replaced, or substantially improved on sites located in an existing manufactured home park or subdivision, unless on a site where substantial damage as a result of flooding has occurred, shall be elevated such that either the:
A. Lowest floor, or bottom of the lowest horizontal structural member, as applicable to the flood hazard area, is at or above the base flood elevation.
B. Bottom of the frame is supported by reinforced piers or other foundation elements of at least equivalent strength that are not less than 36 inches in height above grade. (Ord. 1259, §9, adopted 2025)
§9655 DETACHED GARAGES AND ACCESSORY STORAGE STRUCTURES
The provision in Appendix G for garages and accessory structures shall be replaced with this Section. Detached garages and accessory storage structures used only for parking or storage are permitted below the base flood elevation provided the garages and accessory storage structures:
A. Are one story and not larger than 600 square feet in area when located in special flood hazard areas other than coastal high hazard areas.
B. Are anchored to resist flotation, collapse or lateral movement resulting from flood loads.
C. Have flood openings in accordance with the building code.
D. Have flood damage-resistant materials used below the base flood elevation.
E. Have mechanical, plumbing and electrical systems, including plumbing fixtures, elevated to or above the base flood elevation. (Ord. 1259, §9, adopted 2025)
§9656 FLOOD CONTROL PROJECTS; GENERAL
In addition to applicable Federal, State and other local permits, a permit for floodplain development is required for construction of flood control projects. The purpose for the permit is to examine the impact on flood hazard areas, floodways, and base flood elevations shown on the FIRM. Unless otherwise authorized by separate regulations, issuance of this permit does not address the sufficiency of the structural elements of the proposed flood control project. Permits for floodplain development and building permits in areas affected by proposed flood control projects shall not be issued based on Conditional Letters of Map Revision issued by FEMA. (Ord. 1259, §9, adopted 2025)
§9657 FLOOD CONTROL PROJECTS; APPLICATION
Applications for permits for flood control projects shall include documentation including but not limited to:
A. Site plan or document showing the existing topography and the boundaries of the flood hazard areas, floodway boundaries, and base flood elevations shown on the FIRM.
B. Site plan or document showing the proposed topography and the proposed changes to the boundaries of the flood hazard areas, floodway boundaries, and base flood elevations.
C. The documentation submitted to FEMA for a Conditional Letter of Map Revision (CLOMR) and, if issued, the Conditional Letter of Map Revision. Submittal requirements and processing fees shall be the responsibility of the applicant. A CLOMR is required when a proposed flood control project alters a floodway and increases base flood elevations more than greater than 0.00 feet, or alters a watercourse a riverine flood hazard area for which base flood elevations are included in the Flood Insurance Study or on the FIRM and floodways have not been designated and increases base flood elevations more than 1.0 foot. (Ord. 1259, §9, adopted 2025)