7886

• UCREFRP Catalog Number: 7886
• Author: Hydrosphere Resource Consultants.
• Title: Yampa River Basin Recommended Alternative, Detailed Feasibility Study
• USFW Year: 1995.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

Reservoir Operating Studies

Table 2-3
Modeled Flows at Maybell
Current Conditions with Consulted Depletions (cfs)
%
*
exc.
50% exc. 75
Month 25% exc.
October 291 204 129
November 344 255 209
December 322 228 179
January 284 217 179
February 336 256 238
March 717 498 395
April 3,117 2,086 1,381
May 7,016 5,754 4,039
June 6,363 5,147 3,644
July 1,753 999 444
August 368 220 91
September 163 91 31
* 25th percentile exceedance level - representative of wet years
* * 75th percentile exceedance level - representative of dry years
Table 2-4
Preliminary* Flow Recommendations at Maybell Gage
Month Recommended Flow (cfs)
October 204 (50% exc.)
November 255 (50% exc.)
December 228 (50% exc.)
January 217 (50% exc.)
February 256 (50% exc.)
March 498 (50% exc.)
April
May
June **
July 999 (50% exc.)
August 220 (50% exc.)
September 91 * * * (50% exc.)
* Still under review by U.S. Fish and Wildlife Service
* * Percentile which occurs naturally in any given year
* * * The 50% exceedance flow for September is 91 cfs based on water availability
considerations associated with the assumptions in the Yampa River Basin
Model. The Service recognizes that the conditions modeled are based on
worst case assumptions and that flows are not likely to drop to this level in the
near future. If this flow level were to regularly occur there may be a need to
fl
ows.
secure augmentation sources to maintain or enhance late summer

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