BOARD01634

• Board Meeting Date: 11/22/1999
• Description: Flood Section - Floodplain Designation and Approvals
• Board Meetings - Doc Type: Memo

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ATTACHMENT 2

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FPR 99-507
Flood Insurance Study, City of Aurora, Colorado, dated September 7, 1998.

KEY ISSUES:
. The Flood Insurance Study prepared by FEMA contains approximate and detailed engineering
information along with IOO-year floodplain delineations for various streams within the City of Aurora.

. Merrick and Company performed detailed hydrologic and hydraulic analyses for Westerly Creek in an
area formerly known as Lowry Air Force Base. The revisions were approved by FEMA as a Letter of
Map Revision and are the basis for the revised Flood Insurance Study (1998) for Aurora.

. This report is the most current regulatory floodplain information available to the community, and
supersedes or is compatible with all previous studies.

. The community takes issue with the floodplain delineations for some of the stream reaches as presented
in the 1998 Flood Insurance Study. There are a number of stream reaches that will be exempted from
designation due to technical or mapping problems.

COMMUNITY RESPONSE:
A notification letter was sent by CWCB staff to the local floodplain administrator to inform
the City of the proposed designation action. The floodplain administrator was also contacted e
via telephone to discuss the Flood Insurance Study and the designation process. A meeting
was then held between CWCB staff and the local floodplain administrator to discuss the
floodplain issues and designation process. The City supports designation and approval of
certain stream reaches, but requested that several streams be exempted from designation due
to technical or mapping problems. The community is very cooperative and will transmit a
letter requesting that certain stream reaches be designated. The designation and approval
for this study is being taken under Rule 9.D.l, community request. The community will send
their request letter in the near future for inclusion in the project file.

SUMMARY:
The staff recommends Board approval of the floodplain resolution for the City of Aurora
designating the September 7, 1998 Flood Insurance Study and the accompanying Flood Insurance
Rate Map. The detailed floodplain information for selected stream reaches contained in the report
and on the maps meets the Board's "Floodplain Designation and Approval Rules". The
designation action will assure that this floodplain information for Aurora is explicitly approved by
the state, thereby complying with state statutory requirements.

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