Chapter 28.08 — ADMINISTRATION

A development permit shall be obtained before any construction or other development begins within any area of special flood hazard established in Section 28.06.020. Application for a development permit shall be made on forms furnished by the floodplain administrator and may include, but not be limited to: plans in duplicate drawn to scale showing the nature, location, dimensions, and elevation of the area in question; existing or proposed structures, fill, storage of materials, drainage facilities; and the location of the foregoing. Specifically, the following information is required.

• A. Site plan, including, but not limited to:

  1. For all proposed structures, spot ground elevations at building corners and twentyfoot or smaller intervals along the foundation footprint, or one foot contour elevations throughout the building site; and

  2. Proposed locations of water supply, sanitary sewer, and utilities; and

  3. If available, the base flood elevation from the Flood Insurance Study and/or Flood Insurance Rate Map; and

  4. If applicable, the location of the regulatory floodway; and

• B. Foundation design detail, including, but not limited to:

  1. Proposed elevation in relation to mean sea level, of the lowest floor (including basement) of all structures; and

  2. For a crawlspace foundation, location and total net area of foundation openings as required in Section 28.10.010 of this ordinance and FEMA Technical Bulletins 1-93 and 7-93; and

  3. For foundations placed on fill, the location and height of fill, and compaction requirements (compacted to ninety-five percent using the Standard Proctor Test method); and

• C. Proposed elevation in relation to mean sea level to which any nonresidential structure will be flood proofed, as required in Section 28.10.010(C)(2) of this title and FEMA Technical Bulletin TB 3-93; and

• D. All appropriate certifications listed in Section 28.08.030(D) of this title; and

• E. Description of the extent to which any watercourse will be altered or relocated as a result of proposed development.

• (Ord. 985 § 1, 2001)

The director of public works or designated representative is appointed to administer, implement, and enforce this title by granting or denying development permits in accord with its provisions. (Ord. 985 § 1, 2001)

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City of Palm Desert, CA § 28.08.030

PALM DESERT CODE

§ 28.08.030

The duties and responsibilities of the floodplain administrator shall include, but not be limited to, the following.

• A. Permit Review. Review all development permits to determine that:

  1. Permit requirements of this title have been satisfied;

  2. All other required state and federal permits have been obtained;

  3. The site is reasonably safe from flooding; and

  4. The proposed development does not adversely affect the carrying capacity of areas where base flood elevations have been determined but a floodway has not been designated. For purposes of this title, "adversely affects" means that the cumulative effect of the proposed development when combined with all other existing and anticipated development will increase the water surface elevation of the base flood more than one foot at any point.

• B. Review, Use and Development of Other Base Flood Data.

  1. When base flood elevation data has not been provided in accordance with Section 28.06.020, the floodplain administrator shall obtain, review, and reasonably utilize any base flood elevation and floodway data available from a federal or state agency, or other source, in order to administer Chapter 28.10. Any such information shall be submitted to the city council for adoption; or

  2. If no base flood elevation data is available from a federal or state agency or other source, then a base flood elevation shall be obtained using one of two methods from the FEMA publication "Managing Floodplain Development in Approximate Zone A Areas — A Guide for Obtaining and Developing Base (100-year) Flood Elevations" dated July 1995 in order to administer Chapter 28.10:

     • a. Simplified Method.

       • i. One hundred-year or base flood discharge shall be obtained using the appropriate regression equation found in a U.S. Geological Survey publication, or the discharge-drainage area method, and

       • ii. Base flood elevation shall be obtained using the Quick-2 computer program developed by FEMA, or

     • b. Detailed Method.

       • i. One hundred-year or base flood discharge shall be obtained using the U.S. Army Corps of Engineers' HEC-HMS computer program, and

       • ii. Base flood elevation shall be obtained using the U.S. Army Corps of Engineers' HEC-RAS computer program.

• C.

• Notification of Other Agencies. In alteration or relocation of a watercourse:

1. Notify adjacent communities and the California Department of Water Resources prior to alteration or relocation;

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City of Palm Desert, CA

FLOOD DAMAGE PREVENTION

§ 28.08.030

§ 28.08.040

2. Submit evidence of such notification to the Federal Insurance Administration, Federal Emergency Management Agency; and

3. Assure that the flood carrying capacity within the altered or relocated portion of said watercourse is maintained.

• D. Base Flood Elevation Changes Due to Physical Alterations.

1. Within six months of information becoming available or project completion, whichever comes first, the floodplain administrator shall submit or assure that the permit applicant submits technical or scientific data to FEMA for a letter of map revision (LOMR).

   2. All LOMRs for flood control projects are approved prior to the issuance of building permits. Building permits must not be issued based on conditional letters of map revision (CLOMRs). Approved CLOMRs allow construction of the proposed flood control project and land preparation as specified in the "start of construction" definition.

• E. Documentation of Floodplain Development. Obtain and maintain for public inspection and make available, as needed the following:

  1. Certification required by Sections 28.10.010(C)(1) and 28.10.040;

  2. Certification required by Section 28.10.010(C)(2);

  3. Certification required by Section 28.10.010(C)(3);

  4. Certification of elevation required by Section 28.10.030(B);

  5. Certification required by Section 28.10.060(A);

  6. Reports required by Section 28.10.080(C).

• F. Map Determinations. Make interpretations where needed, as to the exact location of the boundaries of the areas of special flood hazard. Where there appears to be a conflict between a mapped boundary and actual field conditions, grade and base flood elevations shall be used to determine the boundaries of the special flood hazard area. The person contesting the location of the boundary shall be given a reasonable opportunity to appeal the interpretation as provided in Chapter 28.12.

• G. Remedial Action. Take action to remedy violations of this title as specified in Section 28.06.030.

• (Ord. 985 § 1, 2001; Ord. 1228 § 2, 2011)

The city council of Palm Desert shall hear and decide appeals when it is alleged there is an error in any requirement, decision, or determination made by the floodplain administrator in the enforcement or administration of this title.

(Ord. 985 § 1, 2001)

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City of Palm Desert, CA

FLOOD DAMAGE PREVENTION

§ 28.10.010

§ 28.10.010