PROJ00479

• Contract/PO #: C153472
• Contractor Name: San Miguel Water Conservancy District
• Water District: 0
• County: San Miguel
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

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For the purpose of further comparison, the alternatives can be grouped by service areas:

Alternatives

Service Areas

1 and 4
3 and 5
2 and 6

Norwood-Redvale
Lilylands-Dry Creek
All Areas

Table 3 gives the unit costs under each financing scenario and the project improved yields for
each of the three sets of alternatives.

The first two columns in Table 3 (under Norwood-Redvale) indicate that Alternative 4 is the
least-cost alternative for the Norwood-Redvale area. This is due to the fact that Alternative 4
relies primarily upon existing facilities and sources of water as opposed to the development of
new sources in Alternative 1.

A comparison of the two Lilylands-Dry Creek alternatives in the two middle columns of the table
indicates that Alternative 5 (the larger Lilylands Reservoir expansion) is significantly less costly
than Alternative 3. This is due to the higher yields of Alternative 5 and the high fixed costs of the
reservoir expansion. A supplementary screening analysis of a project alternative representing a
variation of Alternatives 3 and 5 was performed at the request of the Lilylands Canal and
Reservoir Company after a preliminary review of the alternative evaluations. The screening
evaluation was of an intermediate size expansion of Lilylands Reservoir to 3000 af total capacity
and revised canal enlargements. The screening analysis resulted in significantly lower costs
than Alternatives 3 and 5; approximately $45 per acre-foot per year under financing Scenario B.

The last two columns of the table do not show a large difference between the unit costs of
Alternatives 2 and 6 which would serve the entire study area. The somewhat higher costs of
Alternative 2 are due to the development of new sources of water as opposed to a greater
reliance upon existing sources in Alternative 6.

Evaluation of San Miguel Canyon Project

Preliminary designs and cost estimates were prepared for a potential pumped-storage
hydropower project consisting of an upper reservoir, a lower reservoir, a shaft and tunnel
connecting the two reservoirs, and a pumping/generating plant.

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