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i? <br />LIST OF FIGURES <br />1.1. Minimum and maximum monthly flows measured at the <br />Lee's Ferry gauging station for pre-dam 1942-62 (top) <br />and post-dam 1963-86 (bottom) periods ...................10 <br />2.1. Map of study area including perennial flow tributaries..15 <br />3.1. Cumulative frequency polygons for mean and coefficient <br />of variation of daily discharge of the Colorado River <br />at Lee's Ferry during 1984-86 ...........................20 <br />3.2. Half-hour instantaneous discharge records at Lee's <br />Ferry for selected days during April 1984 to May 1986. <br />CV = coefficient of variation; where L = 0-3%, I = 3.1-15%, <br />and H = 15.1-100.5%. MEAN = mean of daily flow classes; <br />where L = 3,487-14,000 cfs, I = 14,001-31,500 cfs, <br />and H = 31,501-51-570 cfs ...............................23 <br />3.3. Monthly frequency distribution of coefficient of <br />variation (CV) and mean of daily flows at Lee's Ferry <br />during April 1984 to May 1986. CV and MEAN L, I, and <br />H values given in figure 3.2 ............................24 <br />3.4. Secchi disc readings in the Colorado River below Lee's <br />Ferry (RM 0) during September 1984 and July 1985........27 <br />3.5. Water temperature (o C) of the Colorado River and <br />its tributaries during September 1984 and December <br />1985 ....................................................30 <br />3.6. Daily minimum and maximum discharge of Colorado River <br />at Lee's Ferry (LFD; top) with corresponding minimum <br />and maximum water temperatures at mainchannel RM 61 <br />(top) and backwaters RM 43, RM 56.5, and RM 194 <br />(bottom) ................................................31 <br />-xii-