PROJ00504

• Contract/PO #: C153334
• Contractor Name: Henry Waneka Mutual Reservoir Company c/o City of
• Contract Type: Loan
• Water District: 6
• County: Boulder
• Bill Number: FSA
• Loan Projects - Doc Type: Feasibility Study

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V. PLAN OF DEVELOPMENT

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A. General

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The ne ed for storage in the Lafayette water system has been investigated
and identified as one of the higher priority items for the City, specifically
the renovation of Waneka Reservoir. The present storage requirements are

estimated to be approximately 2,000 acre-feet, of which the City's share of the

current storage in Waneka Reservoir is about 260 acre-feet. Therefore, a signi-

ficant amount of additional storage is required.

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For this analysis, two alternatives were investigated, Rehabilitation

and Enlargement of the dam and reservoir. The Rehabilitation alternative

consists of correcting those deficiencies identified by the State Engineer's

Office such that the storage restrictions can be lifted. The Enlargement

alternative consists of increasing the available storage by raising the height

of the dam. Seepage control was also investigated as part of both alternatives

and consisted of evaluating various facilities to decrease seepage losses thereby

increasing the. water available for use. Presented in the following sections

are the evaluation of .the existing dam and evaluation of the three alternatives.

The project costs are presented in Chapter-VI, and the financial evaluation is

presented in Chapter-VII.

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B. Existing Dam Evaluation

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1 - Inspection

As part of the Dam Safety Program, the State Engineer's Office has

inspected Waneka Dam, as well as other dams 1n the State. The inspection

authority is pursuant to 1973 CRS 37-80-101 et seq. The existing inspection

reports, which were reviewed by WRC staff, identified various problems with

the dam and reservoir beginning on August 5, 1977. The deficiences identi-

fied included:

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