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Maps showing ground-water conditions in the Hopi area, Coconino and Navajo counties, Arizona; 1977

Open-File Report 80-3

Prepared in cooperation with the Arizona Water Commission
By:

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Abstract

The Hop·; area includes about 3,200 mi2 in northeastern Arizona ~nd is mostly in the Navajo and Hopi Indian Reservations; about 400 mi of the area is south of the Navajo Indian Reservation boundary . Ground water occurs in several aquifers that are made up of one or more formations; the composite stratigraphic column indicates the relative position of the formations. The main sources of ground water are the Coconino aquifer, the Chinle Formation. the N and D aquifers, the Toreva and Bidahochi Formations, and the alluvium. The aquifers are separated by fine-grained rock units that inhibit the vertical movement of ground water.

Ground-water development has been slight, and the water is used mainly for public, domestic, and livestock supplies. In 1977 about 425 acre-ft of ground water was withdrawn in the Hopi area. The amount of ground water withdrawn annually is small compared to the potential recharge from precipitation; therefore, water levels generally are not affected by pumping from wells.

Because the ground-water system in the Hopi area has not been changed greatly by development, a large number of water-level measurements and water-quality data collected prior to 1977 are used in this report to show conditions in 1977. A few water-level measurements were made south of the Navajo Indian Reservation boundary in 1977.

The hydrologic data on which these maps are based are available, fo~ the most part, ·in computer-printout form and may be consulted at.the Arizona Water Commission, 222 North Central Avenue, Suite 850, Phoenix, and at U.S. Geological Survey offices in: Federal Building, 301 West Congress Street, Tucson; Valley Center, Suite 1880, Phoenix; and 2255 North Gemini Drive, Building 3, Flagstaff. Material from which copies can be made at private expense is available at the Tucson, Phoenix, and Flagstaff offices of the U.S . Geological Survey.

Study Area

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Maps showing ground-water conditions in the Hopi area, Coconino and Navajo counties, Arizona; 1977
Series title:
Open-File Report
Series number:
80-3
Year Published:
1980
Language:
English
Publisher:
U.S. Geological Survey
Description:
4 Plates: 32.43 x 47.57 inches or smaller
Country:
United States
State:
Arizona
County:
Coconino County, Navajo County
Other Geospatial:
Hopi area