PROJ00304

• Contract/PO #: FS0027X
• Contractor Name: Greeley and Loveland Irrigation Company
• Contract Type: Grant
• Water District: 0
• County: Weld
• Loan Projects - Doc Type: Feasibility Study

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Chapter VI - Selection of Alternative and
Financial Plan

A. Narrative Description

Table VI-l shows a summary of the alternatives examined for the rehabilitation of the outlet
works and lists their advantages and disadvantages. Based on the client preferences, financial,
institutional and social impacts, Alternative 2 (Gate Chamber) was selected as the preferred alternative.

Table VI-l Comparison of Alternatives

Alt. Description Approx. Cost Advantages Disadvantages
I Upstream Gate $ Reliable design. No backup gate.
Low maintenance cost.
Fast construction.
2 Gate Chamber $ 303,000 Reliable design. Second highest cost for structural
Low maintenance cost. alternatives.
Fast construction. Longer construction period.
Backup gate. Limited construction area.
3 Gate Tower $ Reliable design. Limited pool of qualified contractors.
Low maintenance cost. Third highest cost for structural
Backup gate. alternatives.
Highest quality control required.
4 "No Action" $ 16,250.000 Low maintenance cost Highest cost overall.
($2,500 x 6.500AF Loss of valuable storage asset.
yield to replace lost Los.s of agricultural water supply.
water right with CBT
water)

B. Hydraulic, Hydrologic, and Structural Design Criteria

Hydraulic design criteria are primarily limited to the sizing of the' outlet works. The maximum
discharge of the outlet works will be determined based on SEO guidelines presented in their "Dam
Safety Project Review Guide". The structural concrete in the gate chamber will have a 28-day
compressive strength of 4,000 psi and a maximum aggregate size of% inches.

Horseshoe Dam NO.2 Outlet Works Study

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BOYLE