FLOOD04440

• County: Statewide
• Community: All
• Stream Name: All
• Basin: Statewide
• Title: Colorado Flood Map Modernization Business Case Plan - March 2004
• Date: 3/1/2004
• Prepared For: FEMA
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

I
I
I,
I
I
I
I
I
I
I
I'
I
I'
I
I
I
I
I
I

SECTIINONE

Current Program

portions of the county. At the countywide meeting to officially present the new study earlier in
2004, FEMA agreed to incorporate additional floodplain information, inlcluding updated
approximate information for Granby already prepared by the CWCB. That work is being
conducted by FEMA at this time.

Routt County - FEMA began a DFIRM effort in Routt County and the City of Steamboat
Springs prior to Map Modernization funding. While CWCB did not contribute funding to that
effort, CWCB staff participated in numerous coordination meetings for the study. The City of
Steamboat Springs and Routt County both contributed GIS base mapping and new topographic
mapping for the project. The preliminary DFIRM was published in the winter of 2004, and the
study is currently within the 90 day appeal period. Routt County had already identified stream
reaches not included in the new DFIRM and those will be presented to FEMA for possible future
funding.

1.4.2 FY 2003 DFIRM Preparation

FEMA provided FY 2003 funding, with local and state matching funding for DFIRM preparation
in three counties. Those counties, in chronological order of the DFIRM work, are the City and
County of Denver, Douglas County, and Boulder County.

City and County of Denver - With funding from FEMA, UDFCD, and CWCB preparation of a
DFIRM for the City and County of Denver, Colorado's most populous county in 2000, was
begun. Denver contributed new high quality GIS base mapping. UDFCD contracted with a
private consultant to complete the project. No new site-specific engineering work was conducted
as part of this project, but numerous localized engineering adjustments were made. One example
is the adjustment of 20-year old floodplain information prepared long before the completion of
Denver International Airport to reflect the physical changes brought about by the construction of
the airport. The draft DFIRMs were completed on time and submitted to FEMA in early March
2004.

Douglas County - FEMA, CWCB, UDFCD and local governments provided funding for a
DFIRM for Douglas County and the municipalities in the county. Because the northern portion
of the county, including two municipalities, is within the UDFCD boundaries, and the southern
portion is not, the study was split into two contracts. One contract was administered by UDFCD,
with their own consultant team doing the work, and the other contract was administered by
CWCB, with their own team doing that work. The CWCB consultant team then incorporated the
UDFCD consultant's work into a seamless countywide study. County and municipal GIS
information was used for base mapping. The draft DFIRMs were completed on time and
submitted to FEMA in early March 2004.

Boulder County - The planning work for a countywide study in Boulder County began in the
late fall of 2003, but the engineering and GIS work only began in March 2004. The study will
address all of the municipalities within Boulder County, but it will not provide new site-specific
engineering information for numerous streams previously identified by local officials as needing
restudy. There will be new information for one major stream within the City of Boulder and
adjacent portions of unincorporated Boulder County (South Boulder Creek) under a separate
contract. Eventually that new site-specific information will be incorporated into the new
DFIRM. GIS mapping is being provided by local officials. The study is scheduled for
completion in December 2004.

Colorado Business Case Plan - March 2004

1-7