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• Board Meeting Date: 9/18/2007
• Description: Flood Section - Designation and Approval of 100-Year Floodplain Information
• Board Meetings - Doc Type: Memo

equation results. The discharges developed from the HEC-HMS model are detailed in nature, and
ultimately can be used to support either approximate or detailed floodplain mapping.
Community response: No letter has been received from Elbert County, but conversations with Elbert
County indicate that the community desires CWCB designation and approval of the completed hydrology
information. The CWCB staff worked directly with the affected communities during the course of the
study and received input and endorsement for the study methods and results.
Staff findings: CWCB staff has determined that the subject 100-year detailed floodplain information for
the studied stream reaches is conformance with the CWCB's mles and regulations for floodplain
designation and approval. The CWCB staff has relied on the technical competence of Michael Baker, Jr.,
Inc., who produced the study, but also performed an independent technical review of the report. Staff
therefore endorses this study as containing the most current floodplain information available and urges the
affected communities to adopt said study for land use regulation purposes pursuant to statutOlY authority.
Staff recommendation: Staff recommends that the Board: 1) designate and approve the 100-year detailed
floodplain information contained in said report within Elbert County and 2) authorize staff to prepare a
floodplain resolution to be signed by the Director and transmitted to Elbert County. This action is
recommended in order to meet statutory requirements.

STAFF RECOMMENDATION SUMMARY
Resolution Number lJ7-6lJ2:
Staff recommends that the Board: 1) designate and approve the 100-year detailed floodplain information
contained in said report within Jefferson County, City and County of Denver, City of Wheat Ridge, City of
Arvada, and City of Golden and 2) authorize staff to prepare a floodplain resolution to be signed by the
Director and transmitted to UDFCD, Jefferson County, City and County of Denver, City of Wheat Ridge,
City of Arvada, and City of Golden, and to FEMA. This action is recommended in order to meet statutory
requirements.

Resolution Number lJ7-6lJ3:
Staff recommends that the Board: 1) designate and approve the 100-year detailed floodplain information
contained in said report within Routt County, City of Steamboat Springs, Town of Oak Creek, Town of
Hayden, and Town ofYampa, and 2) authorize staff to prepare a floodplain resolution to be signed by the
Director and transmitted to Routt County, City of Steamboat Springs, Town of Oak Creek, Town of
Hayden, and Town of Yampa, and to FEMA. This action is recommended in order to meet statutory
requirements.

Resolution Number lJ7-6lJ4:
Staff recommends that the Board: 1) designate and approve the 100-year detailed floodplain information
contained in said report within the City and County of Denver, and 2) authorize staff to prepare a
floodplain resolution to be signed by the Director and transmitted to the City and County of Denver, and to
the Urban Drainage and Flood Control District and to FEMA. This action is recommended in order to meet
statutory requirements.

Resolution Number lJ7-6lJ5:
Staff recommends that the Board: 1) designate and approve the 100-year detailed floodplain information
contained in said report within Jefferson County, City of Arvada, City of Bow Mar, City of Edgewater,
City of Golden, Town of Lakeside, City of Lake wood, Town of Morrison, Town of Mountain View, City
of Westminster, City of Wheat Ridge, and 2) authorize staff to prepare a floodplain resolution to be signed
by the Director and transmitted to Jefferson County, City of Arvada, City of Bow Mar, City of Edge water,

Flood Protection. Water Project Planning and Financing. Sn-eam and Lake Protection
Water Supply Protection. Conservation Planning

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