PROJ02105

• Contract/PO #: FS0065FX
• Contractor Name: Greeley and Loveland Irrigation Company
• Contract Type: Loan
• Water District: 0
• County: Larimer
• Loan Projects - Doc Type: Feasibility Study

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Chapter VI - Selection of Alternative and Financial Plan

Chapter VI - Selection of Alternative and Financial Plan

A. Narrative Description

Table VI-l presents a summary of the alternatives developed for the low-level outlet works
and lists their major advantages and disadvantages. Based on construction cost and discussions with
the Company, Alternative 3 - Microtunneling, was selected as the preferred alternative and is
highlighted in Table VI-I. The construction cost is anticipated to be approximately $1,135,000.

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Table VI-l
Comparison of Alternatives

Description Approx. Advantages Disadvantages
Cost
Alternative 1- Cut $1,204,000 . Reliable Design. . More pipe to inspect than Alt 2.
and Cover Slightly Higher Flow Capacity.
.
. Lower Cost.
. Less Channel Maintenance Than
Alt. 2.
. Alternative 2 - Cut $1,218,000 . Reliable Design. . Lower flow capacity.
and Cover Variation Less pipe to inspect. More channel maintenance.
. .
. Slightly Higher Cost.
. More excavated material to dispose
of.
. Neighbors may have issues with
open channel.
Alternative 3 - $1,135,000 . Reliable Design. . More pipe to inspect than Alt 2.
Microtunneling . Less Excavation, Backfill, and
Disturbance to surrounding area.
. Lowest Cost.
. . Less Channel Maintenance than Alt.
2.

B. Hydraulic and Structural Design Criteria

The primary hydraulic design consideration is the SED requirement of draining the top five
feet of the reservoir in five days. This rule is explained in detail in section F.l of Chapter ill. In

Boyd Lake Dam Outlet System Feasibility Study

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