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<br />· ~o// OOOll11 <br />~l~;Y ~ :rPP8uJa-.f.tf <br /> <br />~Draft peak flow recommendation~e Gunnison River near Grand Junction, Colorado - number of <br />~ys per year that flows should exceed median Y2 bankfull discharge (8,070 cfs) and median bankfull <br />~v '() discharge (14,350 cfs) based on Pitlick et al. (1999). <br />/~"'I <br />')~ 1\ - Hydrologic Expected Flow Duration8 Instantaneous Peak <br />\ :1 ~ Category Occurrence Flow (cfS)b <br />~ . Days/Y ear > Days/Y ear > eM \,( t1..-.r.... <br />~ .~ vl 8,070 cfs 14,350 cfs oS" lie- <br />f) x.1 Wet 10% 60 -100 15 - 25 10,000 - 23,000 cfsc <br /> <br />'iJ I' Moderately Wet 20% 40 - 60 10 - 20 '(, <br /> <br />/ ~ Average Wet <br />/ .dG,f\ <br />... )r~~ 4~ . Average Dry <br /> <br />~ I> '7\.~ Moderately Dry <br /> <br />~. \a ?/ Dry <br />Il <br />dP <br /> <br />~ <br /> <br /> <br /> <br />f}f) ~ <br /> <br />20% <br /> <br />0-10 <br /> <br />0-0 <br /> <br /> <br />"""~W0A4 <br />o bs "l. f'-(1$i <br />~~s ., <br /> <br />20% <br /> <br />20 - 25 <br /> <br />2-3 <br /> <br />20% <br /> <br />10 -15 <br /> <br />0-0 <br /> <br />~~ '2/;{}tJ <br />b.l..s. ~2.S?() <br /> <br />~ 100;. <br /> <br />0-0 <br /> <br />0-0 <br /> <br />Long-Term Weighted Average <br /> <br />20 - 32 <br /> <br />4-7 <br /> <br />8 Lower value in range is for maintenance of channel conditions, higher (bold) value in range is for <br />improvement. <br /> <br />b Instantaneous peak flow should fall within range when given. When range is not given, instantaneous <br />peak flow should equal or exceed 8,070 or 14,350 cfs according to criteria in flow duration columns. <br /> <br />C Recommended range for instantaneous peak flow within hydrological category; corresponds to observed <br />range within category post Aspinall. <br /> <br />d Recommended peak of 14,350 cfs exceeds peaks observed in category post Aspinall; observed range - <br />9,120-13,200 cfs. Specific recommendations for an instantaneous peak flow will be developed by a work <br />group based on antecedent conditions, reservoir elevation, and other parameters. <br /> <br />C Recommended peak of 14,350 cfs exceeds peaks observed in category post Aspinall; observed range - <br />6,260-9,460 cfs. Specific recommendations for an instantaneous peak flow will be developed by a work <br />group based on antecedent conditions, reservoir elevation, and other parameters. <br /> <br />f Recommended peak of 8,070 cfs exceeds peaks observed in category post Aspinall; observed range - <br />6,360-7,670. Specific recommendations for an instantaneous peak flow will be developed by a work <br />group based on antecedent conditions, reservoir elevation, and other parameters. <br /> <br />g Recommended peak of 8,070 cfs (in some years within category) exceeds peaks observed in category <br />post Aspinall; observed range - 2,590- 6,040 cfs. Specific recommendations for an instantaneous peak <br />flow will be developed by a work group based on antecedent conditions, reservoir elevation, and other <br />parameters. <br /> <br />Ie f).fJ-fJY ~r""'fM"\4.laito... ,,~ . b ,6f,' bA5U: p.r bfJ..t~E:. ~ ~?"", l~ ,. <br />:rp ~ ~4\,Jo-.(I~ wi ~'Idl . baj(.$ 1- P,A~,J ~'1''J4 .p>fls~.d <br />cJ.,~tl-- he"'f~f-IY ^st <br />