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<br />
<br />8
<br />
<br />
<br />Table 1.2.--Notable floods on the Colorado River and its tributaries
<br />
<br /> Peak Drainage
<br /> flow area
<br />River/Location Date (ft3/s) (sq. mi.)
<br />Colorado River July 4, 1884 1125,000 17,800
<br />near Fruita CO June 16, 1921 81,100
<br />Colorado River July 4, 1884 1125,000 24,100
<br />near Cisco UT June 19, 1917 76,800
<br />Yampa River May 27, 1984 70,300 3,410
<br />near Maybell CO June 27, 1983 61,900
<br />Green River June 27, 1917 68,100 44,850
<br />near Green River UT June 17, 1921 65,500
<br />Lower San Juan River Oct. 10, 1911 180,000 12,900
<br />near Ship Rock NM
<br />San Juan River Oct. 7, 1911 85,000 23,000
<br />near Bluff UT
<br />Colorado River July 7, 1884 1300,000 107,900
<br />at Lees Ferry AZ June 18, 1921 220,000
<br />Little Colorado River Sept. 19, 1923 120,000 21,200
<br />at Grand Falls AZ
<br />Virgin River Dec. 6, 1966 35,200 5,090
<br />at Littlefield AZ March 3, 1938 22,000
<br />Colorado River 1862 1500,000 137,800
<br />at Grand Canyon AZ
<br />Colorado River June-July 1862 1400,000 172,300
<br />at Topock Bridge AZ July 10, 1884 1300,000
<br /> June 22, 1921 200,000
<br />
<br />Estimated flows from high water marks; actual flows may have been higher.
<br />
<br />1.5
<br />
<br />PREVIOUS STUDIES
<br />
<br />The studies that follow for Hoover and Glen Canyon Dams provide the
<br />hydrologic design criteria for the existing facilities. They also
<br />establish operating rules for the reservoirs which were used in
<br />developing the new PMFs. Each report is listed in approximate order
<br />of importance to this investigation. Additional reports are
<br />available for other dams within the Colorado River Basin, but have
<br />not been summarized here.
<br />
<br />1.5.1 Hoover Dam
<br />
<br />1. Hydroloqy of the Boulder Canyon Reservoir, by E. B. Debler,
<br />Bureau of Reclamation, January 31, 1930.
<br />
<br />This study includes analyses of floods in the Black Canyon, site of
<br />Hoover Dam. The results were used to size spillways and flood
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