BOARD00538

• Board Meeting Date: 1/23/2002
• Description: Flood Section - Floodplain Designations and Approvals
• Board Meetings - Doc Type: Memo

significantly reduced level of detail to arrive at a hazard delineation without water surface profiles.
CWCB staff performs technical reviews on the followin~ types of reports and maps for approval and
designation by the Board: ; ,

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· "Flood Insurance Study" (FIS), which is produced by the Federal Emergency Management Agency
(FEMA) and used for floodplain management, regulation, and insurance purposes.
· "Flood Insurance Rate Map" (FIRM), which is produced by FEMA and used for floodplain
management, regulation, and insurance purposes. A FIRM may be published with or without an
associated hydrologic and hydraulic report.
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· "Flood Hazard Boundaiy Map". (FHBM), wl1ich j was produced by the Federal Insurance
Administration and are used for floodplain management, regulation, and insurance .purposes. An
FHBM usually depicts approximate floodplain boundaries only, and does not have an
accompanying report. Note: For all FHBM designations, the CWCB staff will perform (in-house or
by contract with a consultant) hydrologic analyses.
· "Floodplain Information Reports", which are produced by local governments, state and federal
agencies, special districts, or the private sector, ilUd are used for floodplain management purposes
and usually adopted by FEMA for use in Flood Insurll.\lce Rate Map revisions.
· Various hydrology studies and related floodplain studies (community-wide or site specific) that
depict 100-year floodplain information that is useful fq>r floodplain management purposes.
· "Floodplain Infornlation" is a generic term used to de~cribe any of the above types of reports and/or
maps in the CWCB's "rules and regulations..." .
· "Floodplain Resolution'" is a formal document prepared by CWCB staff describing the Floodplain
Information that is to be designated and approved by the Board.

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1) Al!enda Item 2.a
Floodplain resolution number: FPR 01-556
Affected communities: Eagle County
Name of study to be formally acted on: "Flood Insurance Study, Eagle County, Colorado,
Unincorporated Areas" dated May 1980. - prepared by the Federal Emergency Management Agency.
Studied streams: The report includes detailed and approximate 100-year floodplain information for
the Eagle River, Brush Creek, and numerous other streams within the County. The studied streams are
in the upper Colorado River watershed. .
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Technical issues: There are a number of specific conune~ts regarding the Flood Insurance Study and
associated materials for Eagle County. The floodplain 1)1aps contain both approximate and detailed
floodplain delineations. Detailed studies have been conducted on the Eagle River, Fryingpan River,
Taylor Creek, Brush Creek, Roaring Fork River, Eagle River and Turkey Creek. There are several map
panels within the County that werenot printed. Most of these panels have the note: "Panel Not Printed
- Area All Zone D". Several of the approximate floodplains, including the Colorado River, Eagle
River, Homestead Creek and Turkey Creek are show approximate floodplains on adjacent panels to
those not printed. There are no detailed .floodplain designations for Beaver Creek and the Eagle River
near Avon. It is likely that due to extensive developme~t in the area, detailed floodplains have been
developed. These should be incorporated into the desig(1ation either now or in the near future. The
only differences found between the 1980 and 1983 Floodway maps was the Eagle River near Eagle
where the river was realigned. Floodplains have not been shown in the White River National Forests.
There are several reservoirs in the Colorado River basin upstream of the study area that would affect

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Flood Protection. Water Project Planning and Financidg . Stream and Lake Protectipn
Water Supply protection. Conseryation Planning

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