FLOOD10362 ‎(2)‎

• County: Broomfield
• Community: Broomfield
• Stream Name: Gay Reservoir Channel
• Title: LOMR - Affected Panel 08014C0091 F, 08014C0092 F - Case No. 03-08-0022P
• Date: 8/25/2004
• Prepared For: Broomfield
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITY
AND COUNTY OF BROOMFIELD, COLORADO, UNDER THE NATIONAL FLOOD INSURANCE
PROGRAM

On September 30, 1997, the Federal Emergency Management Agency identified Special Flood Hazard
Areas (SFHAs) in the City and County of Broomfield, Colorado, through issuance of a Flood Insurance
Rate Map (FIRM). The Mitigation Division has determined that modification of the elevations of the
flood having a I-percent chance of being equaled or exceeded in any given year (base flood) for certain
locations in this community is appropriate. The modified Base Flood Elevations (BFEs) revise the FIRM
for the community.

The changes are being made pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (Public
Law 93-234) and are in accordance with the National Flood Insurance Act of 1968, as amended
(Title XIII of the Housing and Urban Development Act of 1968, Public Law 90-448), 42 U.S.C.
4001-4128, and 44 CFR Part 65.

A hydraulic analysis was performed to incorporate improvements to the Tom Frost Reservoir and Gay
Reservoir Channel and has resulted in a revised delineation of the regulatory floodway, a decrease in
SFHA width, and increased and decreased BFEs for Gay Reservoir Channel. The channelized portion of
Gay Reservoir Channel contains the base flood. The table below indicates existing and modified BFEs
for selected locations along the affected lengths of the flooding source(s) cited above.

Location

Existing BFE
(feet) *

Modified BFE
(feet) *

Approximately 710 feet downstream of Hazel Street
Approximately 1,350 feet upstream of Lowell Boulevard

5,221
5,256

5,220
5,257

*North American Vertical Datum (NA VD), rounded to nearest whole foot. Please note that the NA VD is
3.1 feet higher than the previous datum for the community, the National Geodetic Vertical Datum.

Under the above-mentioned Acts of 1968 and 1973, the Mitigation Division must develop criteria for
floodplain management. To participate in the National Flood Insurance Program (NFIP), the community
must use the modified BFEs to administer the floodplain management measures of the NFIP. These
modified BFEs will also be used to calculate the appropriate flood insurance premium rates for new
buildings and their contents and for the second layer of insurance on existing buildings and contents.

Upon the second publication of notice of these changes in this newspaper, any person has 90 days in
which he or she can request, through the Chief Executive Officer of the community, that the Mitigation
Division reconsider the determination. Any request for reconsideration must be based on knowledge of
changed conditions or new scientific or technical data. All interested parties are on notice that until the
90-day period elapses, the Mitigation Division's determination to modify the BFEs may itself be changed.

Any person having knowledge or wishing to comment on these changes should immediately notify:

The Honorable Karen Stuart
Mayor, City and County of Broomfield
One DesCombes Drive
Broomfield, CO 80020