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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' 2.3.13 Modeling the Orchard Mesa Check Case Settlement - Reduced USA Grand Valle
Y
Power Plant Summer Call and HUP Pool Operation.
An operational rule is available in StateMod and the C1 Data Set set for releasing Surplus HUP Water
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to the USA Power Plant according to the Orchard Mesa Check Case Stipulation and Agreement in
Water Division No. 5 Case No. 91CW247. This operational rule was turned\off in the C1 Data Set
received from the State for purposes of this study. The Ground Rules specified using the C1 Data Set
set in the condition received from CWCB. Consequently all of the analysis completed for Technical
Memoranda 1 -11 used the C1 Data Set data set in which this operational rule remained turned off.
' The necessary operational rule to model the Orchard Mesa Check Case Settlement was turned on in
the C1 Data Set Fourth Revision (see Table 2 and Appendix N).
1 2.3.14 Comparison of Runs
' The difficulty of comparing the output from several model runs on a side-by-side basis was overcome
by the design and implementation of several Excel spreadsheets. These spreadsheets allowed a
detailed comparison of any two runs through the use of pull-down menus to facilitate selection of any
storage reservoir, water diversion, or operational rule desired. In addition the spreadsheets permitted
the user to view both raw data and graphs of any parameter computed by StateMod, including, but not
limited to, end-of-month (EOM) storage, total release, diversions by priority, shortages and individual
' ----ae?ounts. the-se&pr-eadsheets-with all-of the modeled results are included in Appendix P.
' 2.3.15 Procedures to Estimate Outlet Works Capacities
It was necessary to estimate the available release capacity for CFOPS releases in order to ensure that
the StateMod runs did not assume infinite release capacity available for CROPS, CFOPS and normal
operating releases. Available release capacities were estimated using the following procedures.
¦ Monthly releases for Wolford Mountain Reservoir, Williams Fork Reservoir, Granby
Reservoir and Green Mountain Reservoir were obtained from the C1 Data Set Fourth
Revision. Maximum release capacities from these reservoirs were obtained from the
' Colorado River Water Conservation District for Wolford Mountain Reservoir, from
Denver Water for Williams Fork Reservoir and from the U.S. Bureau of Reclamation
for Green Mountain Reservoir and Granby Reservoir. The estimated CROPS releases
' are presented in Table 3.
¦ Available release capacity was estimated by:
Available Release Capacity = Max. Release Cap. - C1 Data Set Fourtb Revision Release -
estimated CROPS Bypass
¦ The principal limiting factor for releases from Ruedi Reservoir is downstream channel
' capacity. Maximum channel capacity on the Frying Pan River near Basalt is 1,100 cfs
(see Technical Memorandum No. 5 - Appendix F). For Ruedi Reservoir, available
release capacity was estimated by:
I PAData\GEN\CWCB\19665\Report Phase 2\FinalReport9.03\Final_CFOPS_Report(9-03).doc 29