AZ vs. CA:02 California Exhibits, Vol II; Nos. 58-113A

page 5

-5- greatest amount of water during the irrigation season. The river begins to rise in March, reaches the high water stage in June, and falls gradually until October. The flow varies between 9,000 cubic feet per second at extreme low water, and 300,000 cubic feet in extreme flood. The mean flow for the irrigation season will approximate 40,000 cubic feet, a sufficient amount for the irrigation of 8,000,000 acres. As near as I am able to determine, the area susceptible of irrigation from the Colorado, is about 3,000,000 acres, located as below: Under our proposed system 1,500,000 In Arizona, and Sonora, Mexico, below Yuma, 250,000 Between Yuma and the Grand Canon, 250,000 Above the Grand Canon in Colorado, Utah and Wyoming, 1,000,000 3,000,000 It is possible that the acreage above the Grand Canon may exceed this estimate, if so, it will tend to our advantage, for the reason that the irrigation season in those high altitudes being from May until September, lands so situated can only use water during the high-water season. These lands will then act as storage reservoirs, and will drain slowly back into the river, and very materially increase the low water supply. Our gain by this would be due, not to a need of an increased supply, but to the fact that if the river falls too low the expense of diverting the water will be increased. Quality. In appendix (b) I show the analysis of the river water made by the University of Arizona. This