7316

• UCREFRP Catalog Number: 7316
• Author: U.S. Army Corps of Engineers.
• Title: Redlands Dam Fishway Feasibility Study, Gunnison River, Colorado.
• USFW Year: 1986.
• USFW - Doc Type: Walla Walla.
• Copyright Material: NO

(e) The trash shear boom will reduce the amount
of trash and debris that RWPC must handle at the dam, in the power canal,
and at the powerhouse. Because of this overall reduction of debris, RWPC
will still be responsible for debris removal.
(2) Impacts Affecting FWS.
(a) FWS will operate and maintain the fishway
facility. This alternate will require that fish be released from the
trap periodically (check trap every day during migration season), and the
auxiliary flow valve and entrance slide gates be adjusted.
(b) Also, some maintenance of mechanical equipment
(valve, slide gates, fish hoist) is required intermittently to keep these
items in proper working order.
5. Estimate of Costs.
a. Table 6, Estimate, Alternate No. 4, presents the
materials and installation costs of the fish ladder, bar screen, and
trash shear-boom. At the feasibility study level, a contingency factor
of 25 percent is added to the materials and installation costs to account
for the uncertainty of a feasibility level study.. An additional 20 per-
cent has been added to the construction estimate to account for engineer-
iny and design, construction supervision and administration, engineering
during construction, site geologic explorations, topographic surveys, and
miscellaneous costs. The total job cost for Alternate No. 4 is $512,500.
b. This design, as studied and estimated, includes the
trash shear boom constructed from logs (see Plate 14 for details). The
log boom, designated as Option A, is considered an appropriate design
choice. Option 8, a Slickbar trash boom may also prove to be appropriate
for this installation. If so, the selection of Option B would be a
substantial cost savings to the project. The final choice of trash boom
will be made during preparation of plans and specifications.
c. The design life of this project is estimated as 50
years, taking into consideration the age (68 years old) of the existing
dam structure. During the life of the. project, the large mechanical
equipment items should only require proper maintenance. The only item
that wool d require replacement during the project 1 ife i s the 1 og trash
shear boom. Based on a study of trash shear booms at a Corps of
Engineers dam, the life cycle cost is lowest for a log and timber type
boom. The log and timber components have a 10-year life and the boom
cable has a 25-year life. All other components have a design life longer
than 50 years and. would not require replacement. The present worth of •
the trash shear boom replacement costs for this alternate is $12,800.
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