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<br />, <br /> <br />In addition to the monthl flow rates recommended in Table 5, the Service has also recommended <br />the followi <br /> <br /> <br />. Greater than 23,000 cfs in at least one in four (25%); high water years <br />. 20,500 cfs - 23,000 cfs in at least one in four (25%) ; normal water years <br />. 12,900 cfs - 20,500 cfs to occur with a frequency of no more than two of four years <br />(50%), with a minimum to occur in no more than one in five years (20%) ; low water <br />years. <br /> <br />The monthly peak flows are included in the peak months shown in Table 5 and Figure 2, <br /> <br />Physical Water Availability Conclusions <br /> <br />Table 6 is a summary of peak flows at the 15 Mile Reach. The peak flows are graphically shown in <br />flow duration curve in Figure 27. The curve is based on peak flow data for each year of the study <br />period with the exception of 1978. No diversion record were available in 1978 for GVP and GVIC, <br />Peak flow at the top of the 15 Mile Reach was determined by taking the recorded peak flow for each <br />year and adding in Plateau Creek's flow for that same day, then subtracting GVP and GVIC <br />diversions, Return flows from GVP power plant and OMID pumping plant were added back in to <br />get the peak flow at the top of the 15 Mile Reach, <br /> <br />Figures 3 through 14 are the flow duration curves based on average adjusted daily flows for the <br />entire 1970 - 1992 study period for each month Adjusted daily flows are average daily flows <br />adjusted for the current level of development, as discussed previously. As an example, for the month <br />of October a 32 percent probability of exceedance corresponds to 1630 cfs, which could occur on <br />anyone day in October, adjusted for the current level of development. <br /> <br />Figures 15 through 26 are flow duration curves generated using average adjusted monthly flow rates, <br />The flow rates were taken from data presented in Table 4. <br /> <br />16 <br />