7865

• UCREFRP Catalog Number: 7865
• Author: Wright Water Engineers, I.
• Title: Estimated Costs for East Branch Creek and Adobe Creek Reservoir Systems and Colorado River Pumping Facilities.
• USFW Year: 1990.
• USFW - Doc Type: \
• Copyright Material: NO

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Mr. Ed Rosar
March 21, 1990
Page 4
6. Direct Pumping to Canals from Diversion Point Upstream of Mack Location - 310
cfs capacity diversion/pump station and pipeline to canals (no reservoirs.)
7. Combined Direct Pumping to Canals and Reservoir Flow to Canals - 310 cfs capacity
diversion/pump station and pipelines to canals, and 125 cfs pumping to reservoirs.
The conceptual layout of the facilities are indicated on Figure 1.
A Colorado River diversion facility is required. This would be constructed of slotted
stainless steel well casing installed in the river bottom. A pumps station will lift the water
370 feet to East Branch Reservoir for Alternative 1 or 470 feet to Adobe Creek Reservoir
for Alternatives 2, 3, and 4. The pipeline route generally follows existing roads and the
pipe would be installed in road right-of-ways. The sizing of the pumping station and
pipelines is based on a five month pumping period (March-July) with an 80 percent
utilization factor.
For Alternative 3, consideration was given to a gravity pipeline from Adobe Creek
Reservoir (water surface elevation 4,920 feet) to East Branch Creek Reservoir (water
surface elevation 4,820 feet). The length of the gravity line, following contours, is
approximately 7 miles through difficult terrain as compared to the 3-1/2 mile distance from
the pumped pipeline bifurcation to East Branch Creek Reservoir. The gravity conveyance
system costs were sufficiently greater to exclude the gravity system from further
consideration.
Releases to the Government Highline Canal will be made directly from the East Branch
Reservoir for Alternatives 1 and 3. The other release points to the canals will be at the
intersection of the canals and the transmission pipeline will serve as a fill and release line.
Alternative 4 has increased capacity to simultaneously pump directly to canals and release
from reservoirs to the canals. Reservoirs are not included in Alternatives 5 and 6. These
direct pumping alternatives lift water approximately 280 feet in elevation to the
Government Highline Canal. In order to minimize the length of pipeline required, a
diversion point about four miles upstream of the Mack alternate diversion location was
analyzed in Alternative 6.
Alternative 7 is a combination of Alternative 5 with a direct pumping supply of 310 cfs to
the canals and Alternative 4 with the two reservoirs and a fill rate of 125 cfs.
Pumping power costs are estimated based on a cost of $0.08 per kilowatt-hour. Evaporation
from the reservoirs is made up every year. Pumping costs are based on supplying exchange