FLOOD04928

• County: Denver
• County: Jefferson
• Community: Denver, Edgewater, Lakewood, Wheatridge
• Stream Name: Sloans Lake Basin
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 12/1/1977
• Prepared For: Denver / Lakewood
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Table 3 presents a summary of all sub-basin alternatives considered

in this investigation in which a brief identification of each improve-

ment is made, to include its construction and right-of-way costs

and associated benefit-cost analysis. Also included on this table,

as an alternative action for each reach, is the "do-nothing" approach

in which no improvements would be implemented.

Reach A4-A2

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The required storm drainage facilities to provide five-year storm

protection to this reach have been recently constructed.

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Reach A-A3

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SELECTED ALTERNATIVE

As a result of the thorough study and investigation of the Sloans Lake

basin, a combination of Basin Alternatives 1, 2 and 3 was recommended

in the Phase A report. After conducting several public meetings and

holding numerous discussions with the Drainage District, Denver, Edge-

water, Lakewood and Wheat Ridge, the following combination of sub-

basin alternatives were selected:

General

1. Recommend enforcement of flood plain regulations on the
lOa-year flood plain.

2. Provide adequate inlets and other structures to insure that
flood waters will enter the proposed pipes, culverts and
channe 15.

Since the recommendation on Reach A2-A3-B will result in a

substantial flow reduction in lower Colfax and the fact that the

Lakewood Gulch flows do impact this area a great deal more than

Sloans Lake discharges, it is recommended that any improvements in

the lower Colfax area be closely coordinated with the Lakewood

Gulch study.

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Reach B-D/J

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No improvements are recommended for this reach.

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4. Encourage the purchase of flood insurance.

Reach A2-A3-B

The recently constructed storm sewer in 17th Avenue should be ex-

tended to the intersection of 16th Avenue and Grove Street to

alleviate flooding problems in the area. In addition, the inter-

ception of the entire five year flow at the intersection of 16th

Avenue and Grove Street would reduce flooding problems and attendant

facility requirements at Reach A-A3, Lower Colfax, because it

will divert away approximately 40 c.f.s currently tributary to

the lower Colfax area.

Reach D-E

1. Design a 25-year frequency grass lined channel from Sloans

Lake to Ingalls Street. A greenbelt approach with a combination

maintenance/hiker-biker trail and side slopes as flat as possible

should be used.

2. Conduits at Eaton, Depew and Harlan should be designed for

25-year frequency flood.

3. The conduit at Sheridan Boulevard will be a 25-year design with

a maximum lOa-year flood depth over the road of 6".

4. The block between Harlan and Gray has been acquired by Edgewater

for a park site. Design of the channel should be coordinated

with Edgewater to insure maximum use of this block.

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3. In 1 ets shou 1 d be "Type R" as des i gnated by the Co 1 orado
Division of Highways and should be designed using the
Standard Curb-opening Inlet Chart in the June 1977 issue
of "Flood Hazard News"" Inlets should be designed for at
least the five-year local inflow or to match the capacity
of the conveyance structure.

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Reach E-F

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1. Design a five-year conduit between Ingalls Street and Pierce

Street. The conduit will be in the street right-of-way be-

tween Ingalls and Otis Street.

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