A method for estimating ground-water return flow to the lower Colorado River in the Yuma area, Arizona and California — Executive summary
No abstract available.
Arizona, California↗
Geology topics
S. A. Leake
Publications and source records attributed to S. A. Leake.
Maps showing ground-water conditions in the northern part of the Gila River drainage from Painted Rock Dam to Texas Hill area, Maricopa, Pima, and Yuma Counties, Arizona; 1978
The Gila River drainage from Painted Rock Dam to Texas Hill area includes about 3,000 square miles in southwestern Arizona. Ground-water development has taken place only in the northern part of the area, and only this part is included in the report. The southwestward-flowing Gila River drains the 1 ,900-square-mile northern part of the area. The main water-bearing unit is the valley-fill deposits. Since 1967, the estimated ground-water pumpage has exceeded 100,000 acre-feet per year, and in 1977 the ground-water pumpage was 210,000 acre-feet; the ground water is used mainly for irrigation. The ground-water withdrawals have resulted in general water-level declines in most of the area. Information shown on the maps includes change in water level, 1965-78 and 1973-78, and irrigated area; depth to water, altitude of the water level, and well depth; and specific conductance and fluoride concentration in the water. Hydrographs of the water level in selected wells and a table of historical pumpage also are included. Scale 1:250 ,000.
Arizona↗
Relation between proposed developments of water resources and seepage from the All-American Canal, eastern Imperial Valley, California
A two-layer digital model designed for this study indicated that sealing of the Coachella branch of the All-American Canal would cause an eventual increase in seepage from the All-American Canal of about 15,000 acre-feet annually. Sealing of both the Coachella Canal and the segment of the All-American Canal between Pilot Knob and Drop 1 would result in a lessening of seepage rates from the All-American Canal of 57,000 acre-feet in 1985, but of only 39,000 acre-feet in 2030. Sealing both the Coachella and the All-American Canals would reduce the outflow to Mexicali Valley from 120,000 acre-feet in 1980 to less than 9,000 acre-feet in 2030. The model also indicated that if only the Coachella Canal were sealed, a little less than 40 percent of water pumped from proposed well fields near the All-American Canal ultimately would be derived from increased seepage from the All-American Canal; between 50 and 60 percent of the water pumped would be water that otherwise would flow to Mexicali Valley.
California↗