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<br />15,800 cIs (57 years of gage data). From 1966 to 2003 (38 years) the median peak flow
<br />dropped to 7,620 cfs.
<br />
<br />Pitlick (1999) determined median bankfull flow to be 14,350 cfs for the Gunnison
<br />River. The median peak flow for the Whitewater Gage since 1977 was 6,535 cIs, Median
<br />peak flow was 6,626 for the sum of the Delta and Uncompahgre gages. Annual peaks in the
<br />Gunnison River (Delta and Uncompahgre) for 1998, 1999.2000,2001,2002 and 2003 was
<br />8,383 cis, 5,676 cfs. 4,260 cfs, 4,375 cfs, 1,451 cfs and 5,379 cfs respectively (Figure 9).
<br />
<br />Annual minimum flows summed for the Delta and Uncompahgre gages for 1998,
<br />1999, 2000, 2001,2002 and 2003 were 1,062 cfs, 568 cfs, 1,026 cfs, 832 cfs, 466 cfs and 319
<br />cfs, respectively, The 27-year median annual minimum was 831 cfs (Figure 9), which was
<br />higher than the Colorado River in the 15-Mile Reach. The 40-day low. flow of annual
<br />hydrograph for 1998, 1999,2000,2001,2002 and 2003 was 1,296 cfs, 1,055cfs, 1,129 cfs,
<br />942 cfs, 608 cfs, and 519 cfs respectively (Figure 10).
<br />
<br /> 24000 \-- ----- ---.---- - --l
<br /> 21000 -r- -------
<br /> 18000
<br />:e
<br />.!!. 15000
<br />'" 2003.
<br />It 5379 cis
<br />CD 12000
<br />Q.
<br />ii 2001.
<br />~ 9000 4375 cis
<br />c 2000-
<br />c 2002.
<br /><( 6000 4260 cis
<br /> 1453 cis
<br /> 3000 Median -
<br /> 6626 cfs
<br /> o J ~ ,
<br /> 0 0,1 0,2 0.3 0.4 0,5 0.6 0,7 0,8 0,9 1
<br /> Excedence frequency
<br />
<br />
<br />Figure 9. Exceedence frequency curve for annual peak flow for the Gunnison River (Delta
<br />and Umcompahgre gages summed) for the period of record (1977 to 2003),
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