The central Virgin River basin, in Washington and Iron Counties, Utah, includes about 1,000 square miles in the drainage basin of the Virgin River downstream from the Hurricane Cliffs. Aquifers in both consolidated and unconsolidated rocks supply water for public supply, irrigation, stock, industry, and domestic uses. The chief unconsolidated-rock aquifers are alluvial fans and channel-fill deposits, which supply about 80 percent of the water withdrawn by wells in the basin. The chief consolidated-rock aquifers include the Moenkopi, Chinle, Moenave, and Kayenta Formations, the Navajo Sandstone, basalt, and Tertiary igneous rocks of the Pine Valley Mountains. These aquifers supply water to about half the wells and most of the springs in the project area.
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Ground-water conditions in the central Virgin River basin, Utah