C153379 Feasibility Study

• Contract/PO #: C153379
• Contractor Name: Brook Forest Water District
• Contract Type: Loan
• Water District: 9
• County: Jefferson
• Bill Number: SB 80-67
• Loan Projects - Doc Type: Feasibility Study

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The principal spillway would be located in the ri"ht or southern abut-

ment.

The principal spillway (as well as the reservoi r) was designed to

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accommodate an inflow design flood with a peak flow of 485,000 cfs and a

10-day flood volume of 1,918,000 ac-ft. A primary outlet structure consisting

of a 14 ft diameter pipe would be located between the principal spillway and

the present stream channel.

Just south of the primary outlet structure, an

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irrigation outlet structure consisting of a 9 ft diameter pipe would be

provided to deliver water to the Bijou Canal. In the left abutment, an

irrigation outlet structure consisting of a 10 ft diameter pipe followed by a

4.5 mile canal to deliver water to the Riverside Canal.

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A summary of principal project features include:
Dam
Location: 22 river miles downstream from Greeley

With Flood Control

Without Flood Control

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Height:
Embankment Length:
Embankment Volume:
Principal Spillway:

136.5 ft

130.5 ft
5.4 miles
17,470,000 cu yd

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5.6 miles
19,700,000 cu yd

300 ft wide ungated concrete ogee section, chute and
stilling basin

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Reservoir

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Top of Surcharge Storage Zone:
Top of Active Storage Zone:
Top of Inactive Storage Zone:
Surface Area Top of Active
Storage Zone:

With Flood Control Without Flood Control
1,491,500 ac-ft 1,268,000 ac-ft
483,000 ac-ft 483,000 ac-ft
26,000 ac-ft 26,000 ac-ft

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16,500 acres

16,500 acres

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Outlet Works

Primary Outlet - 14 ft diameter steel lined concrete conduit with inlet
tower

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Bijou Canal Outlet - 9 ft diameter concrete conduit with inlet tower

Riverside Canal Outlet - 10 ft diameter concrete conduit with inlet tower

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