WSP05650

• File Number: 8200.766
• Description: Gunnison River General Publications-Correspondence-Reports
• State: CO
• Basin: Gunnison
• Water Division: 4
• Date: 2/1/1988
• Author: BOR
• Title: Upper Gunnison-Uncompahgre Basin Model Inflow Development
• Water Supply Pro - Doc Type: Report/Study

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UncompaQgre River indicates that the majority of the difference must occur in

the Gunnison River stations, however, it is unknown which s.tation it is.

The 1977-86 data indicated that 14 percent of the total gains occurred in

the lower reach and 86 percent in the upper reach. Gains for the upper and

lower reaches of the Gunnison River were assigned a proportional amount of the

total long-term gains based on these percentages. The gains for the lower and

upper reaches are given in files INFL3 and INFL4, respectively (copies of

these files are given in Appendix F).

Upper Gunnison Mainstem and Subbasins

above Crystal Dam: [INFL5 - INFL51]

Core station virgin flow file development

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Virgin flow estimates were derived for inflows INFL5 to INFL51 above

Crystal Dam in the Upper Gunnison Basin for the Gunnison River mainstem and

subbasins.

Virgin flows were developed for selected gaging stations to serve as

"core" stations from which inflows within subbasins were derived. Virgin flow

estimates of core stations were derived by adjusting historical gaged flows

for irrigation consumptive use depletions, reservoir storage and evaporation,

and transbasin ~iversions. Flow estimates for each core station were

developed for water years 1952-1983. Core stations for which virgin flows

were derived are listed in Table 1. Locations of virgin flow core stations

are given in Figure 1.

Virgin flow estimates for the Gunnison River at Crystal Dam were used as

a base for development of upstream core station flows. Original virgin flow

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estimates for the Gunnison River at Crystal Dam station were obtained from the

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