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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IV. WATER REQUIREMENTS

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A. Storage Requirements

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The Henry Waneka Reservoir currently provides storage for agricultural

use and for municipal/industrial use through the City of Lafayette shares.

Due to the growth in the Lafayette area, the anticipated future use of the

reservoir is mainly for municipal and industrial raw water storage. The

water requirements will therefore be based primarily On the needs of the

City of Lafayette. However, since the agricultural use will continue in the

future, the agricultural requirements will also be included, based upon pre-

sent demands.

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The future water demands of the City of Lafayette have been previously

investigated. Also, the water system components, needed improvements and

expansions, existing water rights and potential future sources, and storage

requirements have been addressed. The reported present demands of the City

are approximately 1,400 AF per year for a 1980 population of 9,000. The absolute

minimum amount of storage to effectively utilize the City's water rights present-

ly transferred to municipal use is estimated to be approximately 2,000 acre-feet.

When the population reaches 20,000, then the raw water storage requirements will

increase to 4,000 acre-feet.

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Although there are several storage alternatives available, including Gross,
Man,hall, Base line, Leggett-Hillcrest, Valmont, Panama, and Waneka Reservoirs,
the only storage that is immediately available to the City is the Wanek a Reser-
voir. The decreed capacity of Waneka is approximately 662 acre-feet of which
the City owns about 410 acre-feet, or 62%. Due to the physical limitations of
the reservoir and the storage restrictions imposed by the State Engineer's Office,
the available storage is about 420 acre-feet of which the City has rights to
approximately 260 acre-feet, well below the minimum requirements. Therefore, to
meet even present population requirements, a substantial increase in the raw
water storage is required.

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