OCR Text |
Show - 4 - Other small ground-water basins are known to exist in the drainage of the Gila River and its tributaries, such as that in the Chino Valley north of Prescott and that in the Verde River Valley near Clarkdale. Data in hand are insufficient to permit even drawing the outlines of such basins, much less to permit discussing their character. On the map, plate 1, three areas within basins 1 and 2 have been hachured and labeled 1A, 2A, and 2B. These are ground-water subdivisions that have been designated by the State Land and Water Commissioner as critical ground-water areas. A critical ground-water area is denned as follows in the Arizona Ground-Water Code 1948. A "critical ground-water area" is any ground-water basin or any designated subdivision thereof, not having sufficient ground water to provide a reasonably safe supply for irrigation of the cultivated lands in the basin at the then current rate of withdrawal. In general, the designation of a critical ground-water area restricts the construction of additional irrigation wells in the area and prohibits the cultivation of lands not cultivated prior to the time of designating the area as critical. Question II. Give the characteristics of each basin, i. e., the size (in acres), shape, depth and capacity of the water-bearing formations to store and transmit water. The descriptions of ground-water basins included in the overall Central Arizona Project are incomplete in detail. Data do not as yet exist, that would permit definitive statements concerning the shape of the rock walls of the basins against which alluvial materials have been deposited, the overall depth of the basins below present ground level, and the capacity of the several formations to store and transmit water. Data are available from well logs, pumping tests, analyses of well cuttings, geologic mapping, and geophysical |