9600

• UCREFRP Catalog Number: 9600
• Author: Brown and Caldwell.
• Title: Phase 2 Coordinated Facilities Water Availability Study for the Endangered Fishes of the Upper Colorado River - Final Report.
• USFW Year: 2003.
• USFW - Doc Type: \
• Copyright Material: NO

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commitment once made as part of the Biological Opinion. CFOPS will likely be expected to operate
each year that flow in the stream in the 15-Mile Reach is within the target range during the spring run-
off. There is no guarantee that CROPS will actually provide water every year.
As indicated above in the Assumptions and Analysis Procedures section, the Phase 1 report indicated
that CROPS would not be initially included in the baseline hydrology to be used in Phase 2, but
appropriate sensitivity analysis could subsequently be completed to determine if CROPS would affect
the feasibility of specific alternatives to produce the 20,000 acre-feet release. This is the procedure
used in Phase 2. The CROPS releases/bypasses investigated in Phase 2 are detailed in Table 3.
1 2.3.5 Future Depletions
The Phase 1 report directed that: (1) sensitivity analysis will be used in a similar fashion with respect to
the 120,000 acre-feet per year of future depletions, and (2) at the conclusion of investigating each of
the alternatives in Phase 2, the alternative will be subjected to necessary and appropriate sensitivity
analysis to determine if feasibility of the alternative is affected by including the 120,000 acre-feet per
year of future depletions in the baseline hydrology.
' The procedures followed in Phase 2 and the assumptions used for the sensitivity analysis include:
1. Increased average annual diversions from Dillon Reservoir via the Roberts Tunnel of
--approximately 50,000 acre-feet per year-based on a monthly demand schedule for the
study period provided by Denver Water (October 2, 2001 personal communication
from Steve Schmitzer to Bruce Rindahl).
2. An average of 12,000 acre-feet per year of additional depletions at the Adams Tunnel
node during April, May, June and July.
3. An average of approximately 1,000 acre-feet per year taken at Denver Water's existing
points of diversion under Denver's Water existing priorities in the Fraser River system
' and conveyed via the Moffat Tunnel.
4. An average of 20,000 acre-feet per year of additional depletions to the Eagle River
from April 15 July 15 at the Homestake Reservoir node.
5. 14,000 acre-feet per year, on a consistent basis throughout the year, of additional
depletions at a node on the Colorado River immediately downstream from the
confluence with the Roaring Fork. This water would be diverted under a 1960
priority.
6. 14,000 acre-feet per year, on a consistent basis throughout the year, of additional
depletions at the node at the head of the 15-Mile Reach. This water would be diverted
' under a 1960 priority.
The sum of the above listed average annual additional depletions is approximately 111,000 acre-feet
per year. Note that the estimated future depletions from each entity were in total 9,000 acre-feet less
than the original estimate of 120,000 acre-feet.
PAData\GEN\CWCB\19665\Report Phase 2\FinalReport9.03\Final_CFOPS_Report(9-03).doc 23