Major aquifers, well yields, number of index wells and date of last water-level sweep are shown in Table 6.2-3. Figure 6.2-6 shows water-level change between 1990-1991 and 2003-2004. Figure 6.2-7 contains hydrographs for selected wells shown on Figure 6.2-6. Figure 6.2-8 shows well yield for one well. A description of aquifer data sources and methods as well as well data sources and methods, including water-level changes and well yields are found in Volume 1, Appendix A.
Major Aquifers
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Major aquifers in the basin include recent stream alluvium, basin-fill and sedimentary rock (Cottonwood Wash and Muddy Creek formations).
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Most of the basin geology consists of consolidated crystalline and sedimentary rock.
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Data on natural recharge, groundwater in storage and groundwater flow direction is not available for this basin.
Well Yields
Water Level
- Refer to Figure 6.2-6. Water levels are shown for wells measured in 2003-2004.
- The Department annually measures two index wells in this basin. Hydrographs for these two wells are shown on Figure 6.2-7.
More recent hydrographs of the index wells may be available through the Department's GWSI webpage.
- The water level in one well was at a depth of 21 feet and rose by more than 30 feet between 1990-1991 and 2003-2004. Water level in the other well is at a depth of 508 feet and was generally stable between 1990-1991 and 2003-2004.
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Click to view Table 6.2-3 Groundwater Data for the
Grand Wash Basin
Click to view Figure 6.2-6 Grand Wash Basin
Groundwater Conditions
Click to view Figure 6.2-7 Grand Wash Basin Hydrographs
Showing Depth to Water in Selected Wells
Click to view Figure 6.2-8 Grand Wash Basin
Well Yields
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Arizona Department of Water Resources
Statewide Planning, Water Atlas owner of this page.
