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<br />Biologic Flow Recommendation <br />The summer flow recommendations, which meet 3 of 3 criteria and are within the accuracy range <br />of the R2CROSS model are 5.6 cfs (upper segment) or a 3.6 cfs enlargement and 7.6 cfs (lower <br />segment) or a 5.6 cfs enlargement (See Table 1). <br /> <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 Saguache Creek near Saguache, CO (ill #08227000), which has a <br />drainage area of 595 square miles (See Gage Summary in Appendix C). The total drainage area <br />of the Sheep Creek Drainage is approximately 75.8 square miles. The period of record for this <br />gage was 1910 to 2000, the period of record used by staff in their analysis was 1910 - 2000, or <br />83 years of record. Tables 2, 3 and 4 below display the flow of Sheep Creek upstream of <br />Spanish Creek (Table 2), upstream of East Pass Creek (Table 3) and upstream of Saguache <br />Creek (Table 4), in terms of a percentage of exceedence. <br /> <br />Table 3: Sheep Creek Estimated Flow upstream of East Pass Creek. <br />Exceedences <br />1% <br />5% <br />10% <br />20"10 <br />50"10 <br />80% <br />90% <br />95"10 <br />99% <br /> <br />Januarv Februarv March ADrll Mev June JulY Au.ust September October November December <br />3.48 4.07 8.56 29,30 53,24 55.25 30.20 23,10 16.89 10.85 7.15 4.37 <br />2.98 3.48 6,26 15.89 40.03 40.97 21,40 16,69 11.72 8.05 5.46 3.68 <br />2.96 3.16 5.46 11.22 31.69 34,37 17.58 13.11 8,54 6-85 4.97 3.48 <br />2.68 2.98 4.47 8.14 21.65 25.53 13.61 10.03 6,36 5.56 4.47 3.08 <br />2.28 2.48 3.48 5.17 11.92 14.01 7,85 6.06 4.27 3.87 3.38 2.48 <br />1.79 2.19 2.78 3.87 6.65 6.85 4.07 3.77 2.98 2.88 2.48 1.99 <br />1.69 1.89 2.48 3.28 5.17 4.67 2.98 2.88 2.38 2.48 2.09 1.59 <br />1.39 1.59 2.19 2.88 4.07 2.88 2.34 2.38 1.79 2.19 1.89 1.49 <br />1.09 1.29 1.49 2.09 2.78 1.59 1.69 1.69 1.39 1.59 1.39 1.19 <br /> <br />Sheep Creek Estimated Stream Flow <br />u/s of East Pass Creek <br /> <br />10 <br /> <br />en <br />- <br />U <br /> <br />6 <br /> <br /> <br />---------------------------------------- <br /> <br />8 <br /> <br />4 <br /> <br />2 <br /> <br />o <br /> <br />JAN <br /> <br />FEB <br /> <br />MAR <br /> <br />APR <br /> <br />MAY <br /> <br />JUN <br /> <br />JUl <br /> <br />AUG <br /> <br />SEP <br /> <br />OCT <br /> <br />NOV <br /> <br />DfC <br /> <br />Month <br /> <br />- 4- <br />