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<br />. <br /> <br />. <br /> <br />. <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 Gypsum Creek near Gypsum, CO (ID #09069500), which has a drainage <br />area of 62.7 square miles (See Gage Summary in Appendix C). The total drainage area of the <br />Spring Creek Drainage upstream of the Best Ditch Headgate is approximately 1.4 square miles. . <br />The period ofrecord for this gage was 1950 to 1955 and 1965 to 1972, the period of record used <br />by staff in their analysis was 1950 to 1955 and 1965 to 1972, or 12 years of record. Table 2 <br />below displays the estimated flow of Spring Creek upstream of Headwaters, in terms of a <br />percentage of exceedence. <br /> <br />Table 2: Spring Creek estimated tlow upstream of the Best Ditch Head gate, <br />Ex~ces Jaml3lV Februarv March AlJril Mall June Julv Aunust Seoterrl:ler October NoverrtJer llecemJer <br />1% 0.58 0.54 0.55 0.58 3.01 7,02 268 1.19 0,89 0,76 0.69 0.65 <br />5% 0,54 0.49 0.49 0,56 1.88 4,78 214 1,03 0.83 0.72 0,67 0.63 <br />10% 0.51 0.49 0.49 0,51 1.36 3,97 1.76 0.92 0.78 0.67 0,63 0.58 <br />20% 0,49 0.45 0.45 0,49 0.96 3,30 1.36 0.83 0.65 0,67 0.58 0.56 <br />50% 0.45 0.40 0.40 0.45 0.54 1,99 0.96 0.69 0,56 0.54 0.51 0.47 <br />80% 0,36 0.36 0.36 0.38 0.40 1.25 0,74 0.58 0.49 0.49 0.45 0,38 <br />90% 0,33 0.33 0,33 0.36 0.36 0,89 O.ff/' 0,54 0.47 0.45 0.40 0.36 <br />95% 0,33 0,31 0,33 0.36 0,36 0.67 0.63 0.49 0.45 0.42 0.40 0,31 <br />99% 0,29 0,27 0,31 0,31 0,31 0.63 0,57 0.45 0,40 0,40 0,33 0.27 <br /> <br />Spring Creek Estimated Stream Flow <br />u/s of Best Ditch Headgate <br /> <br />4 <br /> <br />3 <br /> <br />J!! 2 <br />o <br /> <br />---- -- ~ <br /> <br />1 <br /> <br />o <br /> <br />JAN <br /> <br />DEC <br /> <br />FEB <br /> <br />MAR <br /> <br />APR <br /> <br />MAY <br /> <br />AUG <br /> <br />JUN <br /> <br />JUL <br /> <br />sEP <br /> <br />OCT <br /> <br />NOV <br /> <br />Month <br /> <br />Table 2 above shows that the summer and winter recommendation of 0.35 cfs is available for all <br />months. <br /> <br />- 4- <br />