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<br />of Q), the summer flow recommendation based upon meeting 3 of 3 hydraulic criteria and the
<br />winter flow recommendation based upon 2 of 3 hydraulic criteria,
<br />
<br />Table 1: Data
<br />
<br />Party Date Q 250%-40% Summer (3/3) Winter (2/3)
<br />WWW/QR 11/17/98 8,58 21.5 - 3.4 ? 2,0'"
<br />DOW/www 4/15/99 9,39 23.5 - 3,8 6,9 4,5
<br />WWW/QR 11/16/98 12,5 31.:3 - 5,0 16.0 1.6(1)
<br />WWW/QR 11/16/99 10,73 26,$ - 4,3 5,3 4,5
<br />
<br />BLM = Bureau of Land Management DOW = Division of Wildlife WWW=WW Wheeler OR = Queen of the River
<br />(1) Predicted flow outside of the accuracy range of Manning's Equaliorl. ? = Crileria never met in R2CROSS Staging Table.
<br />
<br />Biologic Flow Recommendations
<br />The BLM recommended a 13,0 cfs summer flow and a 4,5 cfs winter flow based on their April
<br />17th, 1996, data collection effort, An alternative flow recommendation was proposed by the City
<br />of Cripple Creek and Cripple CreekNictor Mining Company based on additional data collected
<br />by WWW/QR, of 6,0 cfs, April I through July 31 and 4,25 cfs, August I - March 31. The
<br />WWW/QR flow recommendations were based on an adjustment of the CWCB/CDOW I ft/sec
<br />velocity criteria standard for summer flows down to 0,8 ft/sec (See WWW/QR Executive
<br />Summary), The CWCB tabled action on this flow recommendation until CWCB staff could
<br />review the additional data collected by WWW/QR and to collect additional data, if necessary,
<br />
<br />Staff reviewed the data collected by the BLM and WWW/QR and decided to collect one more
<br />data set, bringing the total number of data sets for review to four. The summer flow
<br />recommendations, which met 3 of 3 criteria amI are within the accuracy range of the R2CROSS
<br />model fall somewhere between 16,0 and 5,25 cfs (See Table I), Averaging the three summer
<br />flow recommendations gives a summer recommendation of 9.4 cfs, The winter flow
<br />recommendations which met 2 of 3 criteria and are within the accuracy range of the R2CROSS
<br />model fall is 4.5 cfs (See Table I), Averaging the two winter flow recommendations gives a
<br />summer recommendation of 4,5 cfs,
<br />
<br />Hydrologic Data
<br />
<br />After receiving the cooperating agencies' biologic recommendation, the CWCB staff conducted
<br />an evaluation of the stream hydrology to determine if water was physically available for an
<br />in stream flow appropriation, The hydrograph was derived from data collected by the USGS
<br />stream gage for Fourmile Creek below Cripple Creek (10 #07096250), which has a drainage area
<br />of 272 square miles (See Gage Summary in Appendix C), The period of record for this gage is
<br />1992 to present, the period of record used by staff in their analysis was 1992 - 1997, or five years
<br />of record, The estimated drainage area of Fourmile Creek upstream and including Cripple Creek
<br />is 272 square, To estimate the flow of Fourmile Creek at Trail Gulch, staff used the measured
<br />flow at the USGS gage and added the estimated inflow from the Carlton Tunnel, approximately
<br />2,8 cfs, to all values, Tables 2 and 3 below display the estimated flow of Fourmile Creek at the
<br />confluence with Cripple Creek and Trail Gulcb, in terms of a percentage of exceedence, The
<br />orange shading highlights how often the summer flow has been available and the blue shading
<br />highlights how often the winter flow has been available,
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