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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 Possum Creek above New Castle, CO (ill #09085400), which has a <br />drainage area of 6.4 square miles (See Gage Summary in Appendix C). The total drainage area <br />of the Possum Creek Drainage upstream of the East Canyon Creek is approximately 6.8 square <br />miles. The period of record for this gage was 1969 to 1982, the period of record used by staff in <br />their analysis was 1969 to 1982, or 13 years of record. Table 2 below displays the flow of <br />Possum Creek upstream of the East Canyon Creek (Table 2), in terms of a percentage of <br />exceedence. <br />Table 2: Possum Creek estimated flow upstream of East Canyon Creek. <br /> <br />Exceederres J;nay Febuarv March Ami rJ'ay .Ilre JUv AucaJSt SedsriJer Q:tober NcMnber ta:eTlJer <br />1% 3,5 2.8 3 13,8 47.00 61 2iOO 7.4 5,3 4.24 3.2 3,49 <br />5% 3 2.5 2.00 7.6 38.3 53 15 6.8 5 3.9 3 3,18 <br />10'1. 2.5 2.4 2.2 5.9 32 44 12 6.4 4.6 3.7 3 2.8 <br />aY/. 2.1 2 1.9 4.3 25.2 33 9.8 5.9 4.1 3.5 2.7 2.6 <br />WI. 1.8 1.7 1.6 2.5 14 18 7,1 4.6 3.2 2.7 2.3 2 <br />00% 1.3 1.4 1.4 1.8 6.38 8 4,8 3 2.3 2.2 1.8 1.5 <br />00'/. 1.1 1.1 1.2 1.5 4,54 6.2 3,7 2.6 2 2 1.1 1.2 <br />95% 0..00 0..78 1.1 1.4 3.57 2.9 1.6 1.27 1 0..9 1 0.933 <br />WI. 0..82 0..477 0.,007 1.2 2.87 1.82 1.4 1.1 0.,82 0..81 0..89 0..881 <br /> <br />Possum Creek Stream Flow <br /> <br /> 4 <br /> 3 <br />J!! 2 <br />(J <br /> - ... ... - <br /> 1 <br /> 0 <br /> JAN FEB <br /> <br /> <br />- - - - - - - - - - - - <br /> <br /> <br />MAR <br /> <br />APR <br /> <br />MAY <br /> <br />JUN <br /> <br />JUL <br /> <br />AUG <br /> <br /><EP <br /> <br />CCT <br /> <br />NCW <br /> <br />DEe <br /> <br />Month <br /> <br />Table 2 above shows that the summer recommendation of 2.4 cfs is available April 15th through <br />October 31 st and the winter recommendation is available November 1 st through December 31 st. <br />The winter flow recommendation were further reduced to 1.6 cfs for the time period of January <br />1 st through April 14th based on limited water availability. <br /> <br />Precipitation Data <br />Staff reviewed local precipitation data sets from 2 different sites located around the Canyon <br />Creek Drainage (see Precipitation Data in Appendix C). These sites include Rifle and Glenwood <br />Springs. Table 3 shows the water year and the percent of average precipitation recorded at each <br />site. <br /> <br />- 4 - <br />