Building in a flood zone in San Diego County

A development permit shall be obtained for all proposed construction or other development in the community, including the placement of manufactured homes, so that it may determine whether such construction or other development is proposed within flood-prone areas and any area of special flood hazard.

No encroachments, structures, fill, new construction, substantial improvements, additions, development, storage or placement of vehicles, debris or other materials, or other uses which may increase flood depths or interfere with flood flows to any degree are allowed unless certification by a registered professional engineer is provided to the Floodplain Administrator through a "No Rise" Certification demonstrating that the proposed use shall not result in any increase in flood levels during the occurrence of the base flood discharge.

For one- and two-family dwelling units and accessory structures, elevated on fill with the lowest floor or slab a minimum one foot above the base flood depth as shown on the effective FEMA FIRM Map.

All new construction, substantial improvements and placement of a residential structure within a special flood hazard area located outside an alluvial fan shall have the lowest floor, including basement, mechanical and utility equipment, and ductwork, but excluding garages used solely for parking or storing vehicles, access to or from the residence or storage in a manner that prevents stored objects from being carried away in a flood, elevated 1 foot above the base flood elevation.

New construction, substantial improvement and placement of any structure in Zone AO or within the alluvial fan boundaries shown on the Borrego Valley alluvial fans map or FIRM, shall have the lowest floor, including basement, mechanical and utility equipment, and ductwork, elevated at least 1 foot above the highest adjacent grade at least as high as the FIRM's depth number.