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<br />the most upstream survey to the most downstream survey. Table I shows \\,'ho collected the data <br />(Pany). the date the data was collected (Date). the measured discharge at the time of the survey <br />(Q). the accuracy range of predicted flows hased on Manning's Equation (240% and 40% of Q). <br />the summer flow recommendation hased upon meeting 3 of 3 hydraulic criteria and the winter <br />flow recommendation based upon 2 of 3 hydraulic criteria. <br /> <br />Table I' Data <br /> <br />Part,. Date Q 250 9'c -40 % Summer (3/3) Winter (2/3) <br />BL~I 7/8/98 2.87 7.2 -1.1 2.7 2.1 <br />BLM 7/8/98 4.18 10.4 - L7 2.1 1.51 ) <br /> <br />BI.~l '" Bureau or Land ~lana~em....m (I) Prool,.t....d no", llUt"lO.k of th.... accurdcy ran~e of ~lanmnl! ' Equall"n <br />? '" Cmeria neva IfI<'t in R2CROSS SlaglR~ Tahk_ <br /> <br />Biologic Flow Recommendations <br />The BLM recommended a 2.3. 1.9 and l. I cfs summer flow and a 0.8 cfs winter flow based on <br />their July glh. 1998. data collection effort and their water availability analysis. Staff has <br />revie.....ed the data collected by the BL~t. The summer now recommendations which meets 3 of <br />3 criteria and is within the accuracy range of the R2CROSS model fall somewhere between 2.7 <br />and 2.1 cfs. Averaging the two summer recommendations gives a summer recommendation of <br />2.4 d.. The winter llow recommendation. which meets 2 of 3 criteria and is within the accuracy <br />of the R2CROSS model. is 2.1 cfs. <br /> <br />Hydrologic Data <br /> <br />After receiving the cooperating agencies' biologic recommendation. the CWCS staff conducted <br />an evaluation of the stream hydrology to determine if water was physically available for an <br />instream flow appropriation. The hydrograph was derived from data collected by the USGS <br />stream gage for East Fork Parachute Creek near Anvil Points (10 #(9092960). which has a <br />drainage area of 14.5 square miles (see Gage Summary in Appendix C). The period of record for <br />Ihis gage is 1976 to 1983, the period of record used by staff in their analysis was 1976-1983. or <br />seven years of record. The estimated drainage area of East Fork Parachute Creek up~tream and <br />including Second Anvil Creek is approximately 8.1 square miles. The drainage area upstream of <br />First Anvil Creek is 11.7 square miles. Tables 2 and 3 below display the estimated llow of Ea~t <br />Fork Parachute Creek at the conlluence Wilh Second and First Anvil Creeks. in terms of a <br />percentage of exceedence. The blue shading highlights how often the summer and winter flow <br />recommendations have heen available. <br /> <br />" '.'""N M'm A . M A I SKltAmhP, o."nhFr N m" , ~ <br /> . , . .., . , .- <br /> . l* ~ " - <br />, , , , , , , , , , <br />",.., 0" ", '00' 5307 1173 2_57 , '" '" 0" '6' 0.S1 <br />""" 035 039 '"" '''' " " "" i " '" '"" '55 '" 036 <br /> , ~ 0 <br /> " , , , , , <br />0 0 <br /> <br />Table 2: E AI. ParadlllleCk downsrream 01 Secon<l AnVIl Creek <br />