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<br />Hydrologic Data <br /> <br />After receiving the cooperating agency's biologic recommendation, the CWCB staff conducted <br />an evaluation of the stream hydrology to determine if water was physically available for an <br />instream flow appropriation. The hydro graph below was derived from data collected by the <br />USGS stream gage for Badger Creek Lower Station, near Howard, CO (ID #07093775), which <br />has a drainage area of 106 square miles (See Gage Summary in Appendix C). The total drainage <br />area of the Thirtyone Mile Creek Drainage is approximately 21.4 square miles. The period of <br />record for this gage was 1980-2001, the period of record used by stafful their analysis was 1980- <br />2001, or 21 years of record. Table 2 below displays the estimated stream flow of Thirtyone Mile <br />Creek, in terms of a percentage of exceedence. <br /> <br />Table 2: Estimated flow Thirtyone Mile Creek. <br /> <br />Exceedences <br />1% <br />5% <br />10% <br />20% <br />50% <br />80% <br />90% <br />95% <br />99% <br /> <br />Januarv Februarv March Aoril Mav June Julv Auaust SeDtember October November December <br />1.02 1.47 2.23 11.17 6.89 3.14 2.89 2.84 1.09 1.23 1.32 1.12 <br />0.89 0.96 1.72 4.41 3.90 2.54 1.62 1.52 0.87 1.07 1.12 0.96 <br />0.76 0.86 1.42 2.13 2.94 2.13 1.32 1.12 0.81 0.95 0.97 0.87 <br />0.66 0.67 1.01 1.52 1.93 1.32 0.95 0.91 0.68 0.82 0.86 0.76 <br />0.53 0.53 0.78 1.01 1.01 0.85 0.62 0.67 0.56 0.63 0.73 0.56 <br />0.40 0.46 0.57 0.82 0.75 0.59 0.52 0.50 0.45 0.53 0.59 0.42 <br />0.35 0.40 0.50 0.69 0.69 0.54 0.47 0.45 0.41 0.49 0.54 0.33 <br />0.32 0.35 0.46 0.63 0.65 0.52 0.45 0.40 0.34 0.47 0.51 0.30 <br />0.21 0.15 0.41 0.52 0.58 0.47 0.41 0.29 0.07 0.19 0.41 0.23 <br /> <br /> Thirtyone Mile Creek Estimated Stream Flow <br /> 2 <br /> 1.5 <br />J!! 1 / --. ... ~ <br />CJ <br /> ---- -~ <br /> 0.5 ., .'"---".--'"-.'"--".'"-.'"--".'"-.'"-......----...'"-......----...,-.'"---".~.'"---".~.'"---".~.'"-.'" <br /> "","'" " " "" ","' '-' ,"' '-'"'" -,"' "","'" ,"' '-' ,"' '-' <br /> 0 <br /> JAN FEE ,,",R APR ,,",y JUN JUL AUG SEP OCT NOV [H <br /> Month <br /> <br />Table 2 shows that the summer flow recommendation of 1.0 cfs is only available at least 50% of <br />the time from April 15 to May 14. The summer flow recommendation was further reduced to 0.5 <br />cfs for the time period of May 15 through October 31 based on limited water availability. Table <br />2 also shows that the wUlter flow recommendation of 0.35 cfs is available at least 50% of the <br />time from November I through April 14. <br /> <br />-4- <br />