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O <br />O <br />0 <br />X <br />W <br />LL. <br />U <br />v <br />3 <br />O <br />J <br />LL. <br />0 <br />O <br />O <br />X <br />U <br />3 <br />O <br />J <br />LL <br />130 <br />120 <br />11o <br />100 <br />90 <br />8o <br />70 <br />60 <br />50 <br />40 <br />30 <br />20 <br />10 <br />0 <br />130 <br />120 <br />110 <br />100 <br />90 <br />80 <br />70 <br />60 <br />50 <br />40 <br />30 <br />20 - I ? AA <br />10 <br />0 <br />63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 <br />CALENDAR YEAR <br />Figure 1.1. Minimum and maximum monthly flows measured at <br />the Lee's Ferry gauging station for pre-dam <br />1942-62 (top) and post-dam 1963-86 (bottom) <br />periods. <br />-10- <br />42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 <br />CALENDAR YEAR