FLOOD10355

• County: Statewide
• Stream Name: Colorado River
• Title: Colorado River Basin Probable Maximum Floods, Hoover and Glen Canyon Dams
• Date: 9/1/1990
• Prepared By: US Department of the Interior Bureau of Reclaimation
• Floodplain - Doc Type: Floodplain Report/Masterplan

January 3
February 2
March 3
April 7
May 11
June 16
July 20
August 18
September 10
October 4
November 3
December 3
Total 100

108,400
72,300
108,500
253,100
397,700
578,400
723,000
650,700
361,500
144,600
108,400
108,500

depletions were typically about 70 percent of the total depletion.
Municipal and industrial (M&I) use accounted for the remaining
depletions. Depletions for M&I use were distributed evenly
throughout the year. Exports from the basin for irrigation and for
M&I purposes were also included, and followed the same pattern as
was used for the within-basin depletions. The resulting monthly
distribution of the depletions was estimated as displayed in
table 5.2. The depletions are expected to increase to
4,820,000 acre-feet above Glen Canyon by the year 2010, and to
313,000 acre-feet from Glen Canyon to Hoover, for a total of
5,133,000 acre-feet.

Table 5.2.--Monthly depletions above Glen Canyon Dam

Month

Percent

Depletion
(acre-feet)

3,615,100

, 5. 3 DEPLETED MONTHLY ANTECEDENT FLOOD FLOW FOR -GLEN
CANYON

Daily data from the 100-year base snowmelt flood were summarized
by month. Using the 1985-1evel depletions, the 1985-1evel
depleted 100-year base snowmelt flood, inflow to Glen Canyon Dam
is 21,759,900 acre-feet. The monthly distribution is shown in
table 5.3.

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