AZ vs. CA:24 California Exhibits, Vol. XXIV; Miscellaneous

page 162

162 PROBLEMS OF IMPERIAL VALLEY AND VICINITY. Irrigation plan.-A. 5-mile feeder canal from the Pine River at Bayfield will deliver water to the Dry Creek reservoir, which may be built to a capacity of 85,000 acre-feet. From the reservoir a 20-mile main canal will serve most of the irrigable area. A portion of the area will be covered by present ditches, which are to be enlarged and extended. Du%$f, w^er--A diversion of 2 acre-feet per acre is anticipated, of which i.25 acre-feet will be consumed. Water supply.-All water is to be taken from the Pine River, whose mean flow at Ignacio is 343,000 acre-feet. On the basis of an average year the relation of water supply and demand is estimated as follows: Water supply and irrigation requirements. Month. April...... May....... June...... July....... August___ September. Total Flow of Pine River. Acre-feet. 41,000 83,000 97,000 42,000 14,000 9,000 286,000 Demands for prior rights. Acre-feet. 6,000 16,000 24,000 16,000 12,000 6,000 Left -for Pine River project. Acre-feet. 35,000 67,000 73,000 26,000 2,000 3,000 80,000 I 206,000 Irrigation demand for Pine River project. Acre-feet. 8,000 20,000 30,000 20,000 15,000 7,000 100,000 Draft on storage. Acre-feet. 13, ( 17,000 Storage.-The 17,000 acre-foot draft on storage may in ordinary years reach 30,000 acre-feet, considering variation in discharges and demands, and in a low year like 1918 the storage requirement would be 50,000 acre-feet. No hold-over capacity is required, and a storage capacity of 25,000 to 40,000 acre-feet will therefore provide an adequate supply in all years. With 85,000 acre-feet of storage available, the water supply for this project is beyond question. FLORIDA RIVER PROJECT. Irrigable area, 15,000 acres. Mean annual temperature, 47°. Mean annual precipitation, 17 inches. Mean precipitation during growing season, 9 inches. Elevation, 6,4Q0 feet. . , Interval between killing frosts (summer), 130 days. Transportation, Denver & Rio Grande Railroad, narrow-gage, passes through the district. Irrigation p\ in.- Water will be taken from the Florida River some 6 or 7 miles northeast of Durango and conducted to lands lying between the Florida and Animas rivers. Storage is expected to be provided by means of small reservoirs on the project. Duty of water.-A diversion duty of 2 acre-feet per acre is anticipated. Water supply.-The mean annual discharge of the Florida a short distance above the proposed diversion and above all present diversions is 92,000 acre-feet. In an average year the relation of supply to demand is estimated as follows: