FLOOD10153

• County: Arapahoe
• County: Adams
• County: Denver
• Community: Commerce City, Aurora, Denver
• Stream Name: Sand Creek
• Basin: South Platte
• Title: FHAD - Sand Creek
• Date: 3/1/1977
• Prepared For: Commerce City, Aurora, Denver
• Prepared By: UDFCD
• Floodplain - Doc Type: Floodplain Report/Masterplan

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8

carried downstream, plugging bridge openings and enlarging the flood plain
beyond what is shown in this report.
From Colfax Avenue to the study limits at County Road 18 (Sheets 52 to 83)
the flood plain is sparsely occupied. A good preventive flood plain management
program in this area can be effective in keeping the flood damage potential from
i ncreas i ng.
Flood Plain and F100dway Data
The limits of flooding for the 100-year flood and the cross sections
utilized in the hydraulic computations are depicted on the attached Flood
Hazard Area Delineation maps. Discharges and water surface elevations for
each cross section are listed in Table 3.
The f100dway is that portion of the channel and adjacent flood plain which
must be left unobstructed in order to pass the 100-year flood without raising
the water surface profile more than an acceptable amount. F100dways will be
determined by the Omaha District, Corps of Engineers at a future date. F100dway
information, when completed, will be available from the Urban Drainage and Flood
Control District.

Chambers Road. Upstream from Colfax Avenue, a good preventive flood plain
management program can insure that the flood damage potential will not be
increased.

- REFERENCES -

-SUMMARY-

1. Denver Regional Council of Governments, Urban Storm Drainage
Criteria Manual, Volume 1, prepared by Wright-McLaughlin Engineers,
Denver, Colorado, March, 1969.
2. U.S. Arl11Y Corps of Engineers, Omaha District, "Flood Plain Information
Metropolitan Region Denver, Colorado; Volume II, Sand, Toll Gate and
Lower Cherry Creeks," April, 1964.
3. , "Interim Report on Sand and
Toll Gate Creeks, Colorado," Volumes I and II, August, 1969 (Revised
January, 1972).
4. , "Special Flood Hazard Report to
Revise Flood Plain Information Metropolitan Region Denver, Colorado;
Volume II, Sand, Toll Gate and lower Cherry Creeks," July, 1971.

This report has identified the water surface elevations and probable flooding

limits for the 100-year flood on Sand Creek. The flood discharges are based on a

future basin population of 600,000 people. The water surface elevations and flood

outlines are based on existing channel conditions and assumed partial debris block-

age of bridges and culverts. This report also contains additional hydrologic

data for the 2-, 5-" 10-, 25-, 50-, 100- and 500-year floods for present and two

future basin conditions.

The potential flood damages are primarily located dbwnstreamfrom Colfax

Avenue. The majority of this damage potential lies between Dahlia Street and