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Show PROBLEMS OF IMPERIAL VALLEY AND VICINITY. General data-Irrigation development. 161 Present. Estimated additional possible. Total ultimate. Colorado........................ 111,000 34,000 12,000 1216,000 483,000 »30,000 J327.000 517,000 42,000 New Mexico.......................................... Utah.................................. Total ............................................... 157,000 j 729,000 886,000 175,000 acres by water from Dolores River. » With Dolorea River water. Average annual discharge of basin at Bluff, Utah. Acre-feet. Present annual discharge....................I......................... 2, 700,000 Future depletion: Navajo, Piedra, and.Mancos rivers, 36,000 acres, at 1 acre-foot.. 36,000 Pine, Florida, and La Plata rivers, 55,000 acres, at 1.25 acre-feet.................................................... 69,000 La Plata Mesa, 40,000 acres, at 1.50 acre-feet................ 60,000 Overland and Turley projects, 483,000 acres, at 2 acre-feet... 966,000 ----------- 1,131,000 Remainder...............................................;.....ly«569,000 Return flow from Montezuma and Dolores projects (Dolores water)........ 81,000 Total.............................................................. 1,650,000 NAVAJO RIVER AND TRIBUTARIES. No definite projects are planned but possibilities of further irrigation largely by individuals are known to exist. Discharge of the Navajo River has been recorded with a mean of 150,000 acre-feet;. The distribution of this supply is such that the 17,000 acres additionally expected to be irrigated will require little or no storage. With a precipitation during the growing season of 10 to 14 inches, a consumptive use of 1 acre-foot is assumed. PIEDRA RIVER. Additional irrigation of 9,000 acres, all in Colorado, is expected, largely through individual effort. The present annual discharge of this river is 405,000 acre-feet. No storage will be necessary. With altitude ranging from 6,200 to 8,000 feet and precipitation in the growing season from 9 to 12 inches, a consumptive use of 1 acre-foot per acre is assumed. , IGNACIO PROJECT. Irrigable area: Colorado, 42,000 acres; New Mexico, 8,000 acres; total, 50,000 acres. Mean annual temperature, 47°. Mean annual precipitation (Ignacio), 16 inches. Precipitation during growing season, 8 inches. Elevation, 6,200 to 7,000 feet. Interval between killing frosts (summer), 130 days. Transportation, Denver & Rio Grande Railroad, narrow-gage, runs through project. |
