Sacramento County Zoning Code § 905-08 Mapping Requirements

• A. In Special Flood Hazard Areas, the Floodplain Administrator shall require a letter of conditional approval in the form of a Conditional Letter of Map Revision (CLOMR) to be obtained from FEMA for any development that will cause an adverse impact (see 906-06 (H)) on the base flood elevation on upstream, downstream, or adjacent properties within a special flood hazard

area. The CLOMR must be received by the Floodplain Administrator prior to any grading or development within the floodplain, and the Letter of Map Revision must be approved by FEMA before the start of new construction (as defined in Chapter 2 of this ordinance) in the special flood hazard area on the effective map.

• B. All new development within Zones AE or AH that will alter or relocate a floodway, or is dependent upon the construction of a levee, shall obtain conditional approval (CLOMR) from the Federal Emergency Management Agency prior to issuance of a Floodplain Management Permit.

• C. In special flood hazard areas designated as Zone A (without an elevation) all new subdivision proposals and other proposed developments (including proposals for manufactured home parks and subdivisions) greater than 50 lots or 5 acres, whichever is the lesser, shall include a base flood elevation data.

• D. In Zone A and local flood hazard areas having a watershed area equal to or greater than one square mile, the base flood elevation must be determined and approved by the Floodplain Administrator. The base flood elevation determined must be submitted to FEMA for a letter of map revision, whenever the proposed project includes:

  1. A residential subdivision of more than 20 lots; or

  2. A new manufactured home park or subdivision; or

  3. A multi-family residential development of 5 acres or 50 units; or

  4. A non-residential development of more than 5 acres.