Menifee, CA Environmental Rules: Flood Elevation Requirements (2026)

020 as the water surface elevation shown on the Flood Insurance Rate Map for Zones AE, AH, A1-30, VE and V1-V30 resulting from a flood with a 1% or greater annual chance of being equaled or exceeded. 050(A)(3)(a) sets the elevation standard, or freeboard, that new construction and substantial improvements must clear: in Zones AE, AH and A1-30 the lowest floor, including any basement, must sit at least 2 feet above the BFE; in an AO zone it must be elevated above the highest adjacent grade to a height 2 feet above the depth number shown on the FIRM, or at least 4 feet above the highest adjacent grade if no depth number is given; and in an unnumbered A zone with no BFE specified on the FIRM, the lowest floor must still be at least 2 feet above the base flood elevation.

Once the structure is finished, the elevation of the lowest floor must be certified by a registered civil engineer or licensed land surveyor and verified by the city's building inspector, with that certification filed with the Floodplain Administrator. 050(A)(3)(b), certified by a registered civil engineer or architect as watertight and capable of resisting hydrostatic and hydrodynamic loads. 050(A)(3)(e).