Page 46

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Page 46
Source
Colorado River problem
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http://digital.library.unlv.edu/u?/dig,8
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350 ALLISON ON THE COLORADO RIVER PROBLEM TABLE 20.-Irrigation Data for Imperial Valley. Year. Acreage irrigated, Imperial Valley, United States, and Mexico. Volume of water, in acre-feet, actually used on lands. Actual water duty, in acre-feet. 1919 1920 1921 1922 1923 553,560 607,000 536,000 565,000 530,000 1,697,336 1,792,484 1,316,205 1,474,999 1,534,422 3.07 2.95 2.46 2.61 2.89 Familiarity with the lands in the Lower Basin, gained over a period of twenty-two years, indicates the following ultimate acreage below the Canyon Section (Table 22) as available for reclamation. By comparison with these lands, others are probably impracticable for any extensive irrigation, either because of altitude, lack of fertility, alkaline tendencies, or prohibitive costs of reclamation. TABLE 21.-Areas Irrigated. Imperial Valley, United States (measured by the actual lands covered by water stock)................................................................... Imperial Valley, Mexico......................................................... Yuma Valley.................................................................... Palo Verde Valley............................................................... Parker Project................................................................. Total..................................................................... 448,893 acres 190,000 " 54,000 " 35,000 " 4,000 " 731,893 acres Besides these 2,000,000 acres, there will be no demand for irrigation, except on high mesa lands where the return from agriculture will not justify the expense of an excessive pumping lift. TABLE 22.-Ultimate Areas Possible of Irrigation Below Canyon Section. Imperial Valley, Mexico (on both sides of the Colorado River)....... Imperial Valley, United States, within the present irrigation district Imperial Valley, outside lands. East and West Mesas___............. Coachella Valley and Dos Palmos...........................,.......... Yuma Project.......................................................... Palo Verde Project, including Cibola Valley................ ......... Above Palo Verde Valley, including Parker Project................... Total........................................................... 740,000 acres 448,893 " 323,000 " 100,000 " 100,000 " 65,000 " 90,000 " Assuming a water duty of 2.8 acre-ft., with a 25% allowance for seepage, evaporation, and carrying losses to the points of delivery, there may be a total maximum demand in the Lower Basin, including Mexico, of 7,000,000 acre-ft. per annum. Considering that the greater portion of the additional lands that may come under irrigation in the Lower Basin are more difficult and expensive to reclaim, it is not likely that they will be brought under cultivation as quickly as the 731,000 acres now irrigated. However, assuming that the agricultural demand will necessitate the same rate, it will be prob-

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