Page 30

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Title
Page 30
Source
Colorado River problem
Is Part Of
http://digital.library.unlv.edu/u?/dig,8
Full text
THE COLORADO RIVER PROBLEM 333 "In the foregoing summary the percentage of maximum shortage is based on the stated amount of annual demand. As irrigation development proceeds, the annual flow at the storage reservoirs would be decreased by more than 1,000,000 acre-ft. when the area of lands estimated to be irrigable in the immediate future receives water, by over 2,000,000 acre-ft. when the area estimated to be irrigable in the near future receives water, and by about 5,000,000 acre-ft. when the area estimated to be irrigable in the distant future receives water. Furthermore, it cannot reasonably be assumed that the shortage will be prorated fully over the lands below Boulder Canyon that now receive a full water supply and require 3,000,000 to 4,000,000 acre-ft. for irrigation. The water shortages for new lands below Boulder Canyon will therefore be greatly increased over the percentages indicated in Table [11]. If irrigation development below Boulder Canyon is based on the theory that a flow of 14,000,000 acre-ft., or even of 13,000,000 acre-ft., can be maintained annually, years are indicated for the distant future when not only would there be no water for new lands, but lands now irrigated would receive a scant supply regardless of whether the storage capacity available be 10,000,000, 20,000,000, or 30,000,000 acre-ft. The data indicate that it is unsafe at this time to plan development on the basis of an annual flow of more than between 11,000,000 and 12,000,000 acre-ft. "The data in Tables 7, 8, 9, and 10 are summarized, as follows: Storage Capacity, in Millions of Acre-Feet. 5. 10. 20. 30. __________________________________________________________________________________________ Annual Demand of 10,000,000 Acre-Feet: Shortage, percentage of time.......... 2 0 .... .... Maximum shortage, percentage...... 7 0 .... .... Overflow, percentage of time.......... 64 62 .... .... Annual Demand of 11,000,000 Acre-Feet: Shortage, percentage of time.......... 16 7 0 .... Maximum shortage, percentage....... 30 Under 20 0 .... Overflow, percentage of time.......... 60 49 31 .... Annual Demand of 11,500,000 Acre-Feet : Shortage, percentage of time.......... ..... 13 .... .... Maximum shortage, percentage....... .... 33 .... .... Overflow, percentage of time.......... .... 33 .... .... Annual Demand of 12,000,000 Acre-Feet: Shortage, percentage of time............... .... 18 11 9 Maximum shortage, percentage........... .... 36 36 32 Overflow, percentage of time.............. .... 28 31 16 Annual Demand of 12,500,000 Acre-Feet: Shortage, percentage of time............. .... 22 .... .... Maximum shortage, percentage........... 38 .... .... Overflow, percentage of time.......... .... 26 .... .... Annual Demand of 13,000,000 Acre-Feet: Shortage, percentage of time.......... .... 27 22 22 Maximum shortage, percentage....... .... 45 41 41 Overflow, percentage of time.......... .... 22 16 11 Annual Demand of 14,000,000 Acre-Feet: Shortage, percentage of time.......... .... .... 31 31 Maximum shortage, percentage....... .... .... 55 55 Overflow, percentage of time.......... .... .... 11 4 "The storage capacity adequate to maintain reasonably uniform annual flow is difficult to determine. It is evidently greater than 5,000,000 and pretty certainly as great as 10 000 000 acre-ft. and less than 20,000,000 acre-ft. Capacity of 10,000,000 acre-ft. will provide annual flow of 11,500,000 acre-ft. with somewhat less onerous conditions of shortage than if capacity of 20,000,000 acre-ft, were utilized to provide annual flow of 12,000,000 acre-ft.

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