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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The Service has indicated the following priorities concerning when diversions to storage would be
made (Smith and Muth, July 1999):
1. Winter,
2. Descending limb of the spring runoff hydrograph, and
3. Ascending limb of the spring runoff hydrograph.
The Service has indicated that: (1) the source of water for the 10,825 acre-feet interim/permanent
commitment during the late summer and early fall will be according to the contracts recently entered
into (Colorado River Conservation District and Colorado Water Conservation Board, 2000 and
Denver Water and Colorado Water Conservation Board, 2000), and (2) these sources of supply are
independent from sources of supply which will be used for the 20,000 acre-feet commitment to be
used for augmenting spring peak flows.
2.3.7 Scoring
An acre-foot of water released or otherwise made available will be counted or credited as meeting the
target flows when:
The flow at the head of the 15-Mile Reach is between 12,900 and 26,600 cfs;
2. The acre-foot of water would not have lieen available-at-that point in time under
baseline conditions without the program and projects to provide the average 20,000
acre-feet; and
3. The acre-foot is made available during the 10-day period surrounding the peak spring
flow; or
4. The acre-foot was not used in the spring, the acre-foot cannot be carried over in
storage until the next spring, and the acre-foot is used to augment low flows during
the July to October period.
In order to be scored as having been available, water will be scored at the source of delivery, not at
the 15-Mile Reach.
Throughout this report, the term, "average 20,000 acre-feet " will be used to indicate the target for
this program. It must be emphasized that this is an average of 20,000 acre-feet added to the spring
hydrograph peak in those years in which the forecast flow at the head of the 15-Mile Reach is
between 12,900 and 29,600 cfs. The calculation to determine the average delivery will be based on
those years in which the peak flow is expected to be between 12,900 and 26,600 cfs.
2.3.8 Piscatorial Purposes
A water right decreed for piscatorial purposes may be required for implementation of several of the
alternatives analyzed in this report. It may be necessary, therefore, to obtain a junior water right for
piscatorial purposes in order to implement those alternatives where there is no existing water right for
PAData\GEN\CWCB\19665\Report Phase 2\FinalReport9.03\Final_CFOPS_Report(9-03).doc
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