FLOOD00850

• Designation Number: 31
• County: Arapahoe
• Community: Unincorporated Arapahoe County
• Title: Major Drainageway Planning - Little Dry Creek, Report, Volume I
• Date: 2/1/1974
• Designation Date: 6/1/1974
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Table 9
OTHER STRUCTURES, NOT IN PLAN E

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Estimated Project Cost
for 100-year
flood capacity

Costs Dependent on
Structure Construction of

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Box Culverts at Uni-
versity Blvd. and
Quincy Avenue in
Cherry Hills Village

Quincy Dam Improvements,
Blackmer Dam Improve-
ments, Berry Dam, Pren-
tice Dam

1.

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$411,000

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*Channelization of
Quincy Gulch in Cherry
Hills Village
a) Above Quincy Dam
to Highline Canal

b) From Blackmer Gulch
up to Quincy Dam

2.

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a) $230,000

not affected

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b) $200,000

Quincy Dam Improvements

*Channelization and
bridge on Greenwood
Gulch at Belleview
Avenue

3.

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Berry-Prentice Dam
Improvements

$264,000

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4.

Canal crossing at
Blackmer Gulch,
South Branch

$ 56,000

not affected

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5.

Canal crossing at
Blackmer Gulch,
North Branch

$ 42,000

not affected

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6.

Baffled Drop Struc-
tu res

approx. $18,000

not affected

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*Not shown on Drawing No. 36. See Quincy Gulch study,
Appendix D to this report.

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Dams. Englewood Dam, remodelled to meet current safety requirements, and

the five proposed additional flood detention dams are designed to

store high-rate flood peaks temporarily and to release then at relatively

low, controlled rates. Their purpose is to reduce downstream peak flood

flow rates and thereby reduce the cost of downstream conveyance works.

No additional permanent water storage is proposed. Existing pools at

Blackmer and Quincy Dams would be maintained at present level.

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Englewood Dam controls about 37 percent of the Little Dry Creek watershed.

The five additional detention dams will control an additional 25 percent

of the watershed, to give a total of 62 percent of the watershed that

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-60-