Major aquifers, well yields, estimated natural recharge, number of index wells and date of last water-level sweep are shown in Table 8.2-6. Figure 8.2-6 shows aquifer flow direction and water-level change between 1993-1994 and 2003-2004 for the entire Pinal AMA. Figures 8.2-6A-B show depth to water during 2003-2004 and water-level change between 1993-1994 and 2003-2004 for selected wells by sub-basin. Figure 8.2-7 contains hydrographs for selected wells shown on Figures 8.2-6A-B. Figure 8.2-8 shows well yields in five yield categories. Underground Storage Facilities (USF) and Groundwater Savings Facilities (GSF) are shown on Table 8.2-7 with facility name, facility permit number and type, permittee name, permitted acre-feet per year and water source. Locations of USFs and GSFs are shown on Figure 8.2-9. 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
- Refer to Table 8.2-6 and Figure 8.2-6
- The major aquifers in this AMA are recent stream alluvium and basin fill.
- Groundwater flow is generally to the north with flow toward cones of depression at the center of the Maricopa-Stanfield Sub-basin and west of Maricopa.
Well Yields
- Refer to Table 8.2-6 and Figure 8.2-8
- As shown on Figure 8.2-8, well yields are generally greater than 1,000 gallons per minute (gpm).
- One source of well yield information, based on 1,582 reported wells, indicates that the median well yield is 1,000 gpm.
Natural Recharge
- Refer to Table 8.2-6
- Natural recharge in the Pinal AMA is estimated at 82,750 acre-feet per year.
- Primary source of natural recharge is streambed recharge along the Gila and Santa Cruz rivers.
Water Level
- Refer to Figures 8.2-6 and 8.2-6A-B. Water levels are shown for wells measured in 2003-2004. Not all water level data shown on Figure 8.2-6 are shown on Figure 8.2-6A-B.
- The Department annually measures 163 index wells in the AMA. Hydrographs for nine of these wells are shown on Figure 8.2-7.
- The deepest water level shown is 662 feet south of I-8 (Figure 8.2-6A) and the shallowest is 24 feet west of highway 387 in the Eloy Sub-basin (Figure 8.2-6B).
Recharge Sites
- Refer to Table 8.2-7 and Figure 8.2-9.
- As of 2008 there were six active USFs and four active GSFs.
- Total permitted storage capacity for USFs is 6,400 acre-feet per year. All USFs are permitted to store effluent.
- Total permitted storage capacity for GSFs is 303,480 acre-feet. All GSFs are permitted to store CAP water.
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Table 8.2-6 Groundwater Conditions in the Pinal AMA
Table 8.2-7 Recharge Sites in the Pinal AMA
Figure 8.2-6 Pinal AMA Groundwater Conditions
Figure 8.2-6A Maricopa-Stanfield/Vekol Valley Sub-Basins Groundwater Conditions
Figure 8.2-6B Eloy Sub-Basin Groundwater Conditions
Figure 8.2-7 Pinal AMA Hydrographs Showing Depth to Water in Selected Wells
Figure 8.2-8 Pinal AMA Well Yields
Figure 8.2-9 Pinal AMA Recharge Sites
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Arizona Department of Water Resources
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