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<br />Table xx, Comparison of Pre- and Post-Navajo dam hydrographs for the San Juan River near Bluff, UT,
<br />Parameter 1929-1961 pre-dam period 1962-1991 post-dam period 1992-1997 Study Period
<br /> Average Minimum Maximum Average Minimum Maximum Average Minimum Maximum
<br />Peak Runoff - cfs 12,409 3,810 33,800 6,749 2,660 15,200 8,772 3,280 11,600
<br />Runoff (Mar.Jul) - af 1,263,890 352,551 3,361,882 891,712 177,190 2,458,190 1,132,899 421,001 1,681,192
<br />Runoff (total annual) - af 1,750,643 618,101 4,241,998 1,587,242 611,196 3,266,017 1,628,165 797,821 2,271,912
<br />Runoff (total annual) - af, adjusted to pre-dam depletions 1,898,000 1,068,000 2,542,000
<br /> Years Total Yrs Frequency Years Total Yrs Frequency Years Total Yrs Frequency
<br />Peak> 1 0,000 cfs 18 33 55% 6 30 20% 2 6 33%
<br />Peak>8,000 cfs 22 33 67% 11 30 37% 5 6 83%
<br />Peak>5,000 cfs 30 33 91% 16 30 53% 5 6 83%
<br />Peak>2,500 cfs 33 33 100% 27 30 90% 6 6 100%
<br />AF>1.000,000 18 33 55% 12 30 40% 4 6 67%
<br />AF>750,OOO 22 33 67% 14 30 47% 5 6 83%
<br />AF>500,000 30 33 91% 20 30 67% 5 6 83%
<br /> Ave. Date Std Dev, Ave. Date Std Dev, Ave, Date Std Dev,
<br />Peak Date 31-May 23 Jun-04 35 07 -Jun 8
<br />Flow duration Avg all yrs Avg flow yrs Maximum Avg all yrs Avg flow yrs Maximum Avg all yrs Avg flow yrs Maximum
<br />Days> 1 0,000 cfs 14 27 76 3 15 48 2 7 8
<br />Days>8,000 cfs 23 34 81 8 22 84 10 12 22
<br />Days>5,000 cfs 46 51 108 28 52 124 51 62 109
<br />Days>2,500 cfs 82 82 140 67 74 150 90 90 137
<br />Base Flow Median High 10% Low 10% Median High 10% Low 10% Median High 10% Low 10%
<br />August 1,156 4,782 300 1,566 3,242 407 1,107 2,497 476
<br />September 1,033 3,383 201 1,174 3,279 478 1,286 2,760 861
<br />October 1,000 2,551 400 1,608 3,317 635 1,089 1,521 716
<br />November 752 1,387 497 1,199 3,205 765 1,141 1,479 982
<br />December 667 1,325 434 1,288 3,389 711 1,049 1,187 769
<br />January 609 1,267 471 1,440 3,226 582 934 2,053 739
<br />February 872 2,265 572 1,661 3,188 823 1,006 2,256 807
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