BOARD00175 ‎(3)‎

• Board Meeting Date: 5/23/2007
• Description: ISF Section - Statement of Opposition - Case No. 5-06CW115, Application of Charles Ogilby
• Board Meetings - Doc Type: Memo

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Map Revisions to Flood Insurance Rate Maps or Flood Hazard Boundary Maps.
Floodplain map revisions (e.g. FEMA Letters of Map Revision) will be designated twice .
annually by the CWCB during a regularly scheduled Board meeting and will not be subject
to a full technical review by the CWCB staff.

It was determined that because a LOMR goes through a comprehensive review process by FEMA and
its technical contractor to determine if the document meets or exceeds all technical requirements set
forth by the Rules, it would be redundant for CWCB staff to undergo a similar review process. For this
reason, it is assumed that a LOMR issued by FEMA' has met all requirements for completeness and
accuracy set forth by the Rules, and it will be presented to the Board twice annually in batch format for
designation without formal staff review.

The CWCB's designation and approvals greatly assist local communities in meeting the statutory
requirements of the State and the regulatory requirel11ents of the National Flood Insurance Program.
Floodplain information is broadly categorized as detailed or approximate using the following
definitions. Detailed floodplain information means fldodplain information prepared using topographic
base maps, hydrologic analyses, and hydraulic calcuhltions to arrive at precise water surface profiles
and floodplain delineations suitable for making land u~e decisions under statutorily authorized zoning
powers. Approximate floodplain information me~s floodplain information prepared using a
significantly reduced level of detail to arrive at floodplain (hazard delineation) without water surface
profiles. CWCB staff performs technical reviews on valious types of reports and maps for approval and
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designation by the Board. .

Consent Al!enda Item 3
Floodplain resolution number: FPR 07-600(a-ee)
Affected communities: Varies, see attached table I
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Name of study to be formally acted on: Varies, see attached table
Studied streams: Varies, see attached table
Technical Issues: Each LOMR in the attached table will formally revise a portion of the existing stated
floodplain designation.
Community response: CWCB staff initiated this designation procedure. All communities were
involved in actual LOMR application and signed Community Acknowledgement Forms, which
acknowledge their involvement in the process and their approval of revised floodplain information.
Staff findings: It was determined that because a LOMR goes through a comprehensive review process
by FEMA and its technical contractor to determine if the document meets or exceeds all technical
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requirements set forth by federal regulations and CWC~ Rules, it would be redundant for CWCB staff
to undergo a similar review process. For this reason,: it is assumed that a LOMR that is issued by
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FEMA has met all requirements for completeness and accuracy set forth by the Rules. CWCB staff
therefore endorses this study as containing the most cuJent floodplain mapping available and urges the
affected communities to adopt said revisions to their fl90dplain maps for land use regulation purposes
pursuant to statutory authority. I
Staff recommendation: Staff recommends that the Board: 1) designate and approve the 100-year detailed
and approximate floodplain information contained in sai~ Letters of Map Revision and 2) authorize staff
to prepare a floodplain resolution to be signed by the Director reflecting the official designation and
approval action. This action is recommended in order to meet statutory requirements.
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Flood Protection. Water Project Planning and FinaJcing. Stream and Lake Protection
Water Supply Protection. Con'servation Planning
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