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Table 3.8.-Mean base flows and base-flow variability as measured by coefficient of variation (cv)a at the USGS stream gage near Jensen, Utah, 1946-1996. Period of Record (1946-1996) Pre-Dam (1946-1962) Post-Dam (1963-1996) Median Median Median within. Year within. Year within-Year CV for CV for CV for Hydrologic Number Mean Daily Mean Daily Number Mean Daily Mean Daily Number Mean Daily Mean Daily Condition of Years Flow (mJ/s) Flow of Years Flow (mJ/s) Flow of Years Flow (mJ/s) Flow ENTIRE BASE.FLOW PERIOD (AUGUST THROUGH FEBRUARY) Wet 5 110.9 29.0% 2 56.0 65.8% 3 113.5 28.4% Moderately wet 10 88.4 24.1% 4 54.2 52.0% 6 93.7 24.1% Average 20 58.5 27.8% 5 36.7 47.9% 15 72.6 27.8% Moderately dry 10 36.8 42.9% 4 29.0 40.5% 6 50.5 21.8% Qry.......................... .. ............?.. ............. .......?:~} ........._.......?:~ :.~.%........ 1 26.3 27.6% 4 35.0 19.9% ............................................................................... ............................................................................. All years 50 62.2 28.8% 16 39.5 47.9% 34 72.8 24.5% SUMMER AND AUTUMN BASE.FLOW PERIOD (AUGUST THROUGH NOVEMBER) Wet 5 110.3 24.0% 2 70.1 51.6% 3 113.9 27.1% Moderately wet 10 83.2 24.6% 4 59.2 39.1% 6 91.4 22.5% Average 20 58.6 26.6% 5 42.4 43.6% 15 66.0 23.9% Moderately dry 10 40.0 28.8% 4 32.1 42.4% 6 50.6 23.8% Qry............. ............... 5 26.1 30.8% 1 28.2 30.1 % ... ........1.. ...... ...._.. ......}~}..... ...._...... .~L~.~...... ............................................................................... .....................................................-......................... All years 50 61.7 26.6% 16 45.3 40.7% 34 69.4 24.0% WINTER BASE.FLOW PERIOD (DECEMBER THROUGH FEBRUARY) Wet 5 118.8 12.8% 2 51.5 88.7% 3 120.0 12.4% Moderately wet 10 95.0 20.7% 4 37.9 27.9% 6 103.4 22.4% Average 20 57.1 21.0% 5 30.1 24.8% 15 78.5 21.0% Moderately dry 10 31.4 24.1% 4 24.1 31.5% 6 50.8 20.2% Qry.......................... .. 5 22.4 18.8% 1 19.7 18.4% 4 37.0 14.0% All Vp"r" . ..........~.ii ................... .~~ .~........._....... ?(;"~'o/~""'" ...........j 'fi" ........ -....... "1;" 7......... -..... "~7"O;,j~""''' . ......... ~4...... ..... .........7R. ri ........- .......;.Q.J..%...... a-rhe coefficient of variation is calculated as the standard deviation divided by the mean and is expressed as a percentage. - "lj S. ;:.. ::>.:l ~ <::> ;:"\. ~ , tv tv V:l ~ ... (\> ;;;: ~ (\> "I tv a a a