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<br />One percent chance exceedence balanced hydrographs were created using the one percent chance
<br />exceedence peak, 1-, 3-, 5-, 7-, 15-, 30-, and 60-day values developed for the study (discussed in
<br />Chapter 5) to balance the pattern hydrograph. The pattern hydrograph was balanced for the locations
<br />along the Taylor and Gunnison Rivers. The pattern hydrograph was balanced using the following
<br />methodology.
<br />
<br />1. The peak flow of the pattern hydrograph was set to the one percent chance exceedence peak flow.
<br />This value was then set in the final balanced hydrograph.
<br />2. The 1-day average was taken by multiplying the 12 hours before and after the peak flow by a ratio
<br />and averaging the entire 24-hour period, including the previously set peak flow. The ratio was chosen
<br />so that the daily average was equal to the one percent chance exceedence 1-day average flow.
<br />These values were then set in the final balanced hydrograph.
<br />3. The 3-day average was taken by multiplying the 24 hours before and after the 1-day flow by a ratio
<br />and averaging the entire 3-day period, including the previously set 24-hour flows. The ratio was
<br />chosen so that the daily average was equal to the one percent chance exceedence 3-day average
<br />flow. These values were then set in the final balanced hydrograph.
<br />4. The process was then repeated in for the remaining 5-,7-, 15-, 30~, and 60-day values.
<br />
<br />Table 6.2.1 lists the one percent chance exceedence values used to develop the one percent chance
<br />exceedence balance hydrographs for each location. The resulting one percent chance exceedence
<br />balanced hydrographs are shown in Figure 6.2.2.
<br />
<br />Table 6.2.1
<br />
<br />One Percent Chance Exceedence Balanced Hydrograph Values
<br />
<br /> Taylor River Taylor River at East River at Gunnison Gunnison
<br /> below Taylor River Near
<br /> Park Reservoir Almont Almont River at Almont Gunnison
<br />Peak Flow 2,573 cfs 4,146 cfs 4,600 cfs 8,680 cfs 10,050 cfs
<br />1-Day 2,114 cfs 3,721 cfs 4,290 cfs 7,810 cfs 9,400 cfs
<br />3-Day 2,019 cfs 3,433 cfs 4,040 cfs 7,510 cfs 9,020 cfs
<br />5-Day 1,950 cfs 3,309 cfs 3,920 cfs 7,270 cfs 8,730 cfs
<br />7-Day 1 ,888 cfs 3,204 cfs 3,710 cfs 7,070 cfs 8,480 cfs
<br />15-Day 1,683 cfs 3,013 cfs 3,310 cfs 6,700 cfs 7,390 cfs
<br />30-Day 1,518cfs 2,673 cfs 2,950 cfs 5,920 cfs 6,490 cfs
<br />60-Day 1,231 cfs 2,091 cfs 2,490 cfs 4,700 cfs 5,560 cfs
<br />
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