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Phoenix AMA Groundwater Conditions

Major aquifers, well yields, estimated natural recharge, number of index wells and date of last water-level sweep are shown in Table 8.1-6Figure 8.1-6 shows aquifer flow direction and water-level change between 1991-1992 and 2002-2003 for the entire Phoenix AMA.  Figures 8.1-6A-D show depth to water during 2002-2003 and water-level change between 1991-1992 and 2002-2003 for selected wells by sub-basin.  Figure 8.1-7 contains hydrographs for selected wells shown on Figures 8.1-6A-D.  Figure 8.1-8 shows well yields in five yield categories.  Underground Storage Facilities (USF) and Groundwater Savings Facilities (GSF) are shown on Table 8.1-7 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 8.1-9.  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 8.1-6 and Figure 8.1-6
  • The major aquifers in the AMA are recent stream alluvium and basin fill. Groundwater is also found in sedimentary rock in some areas.
  • Groundwater flow has been artificially modified generally toward the Gila River drainage and groundwater pumping centers. Groundwater flow is toward cones of depression near Scottsdale, Mesa, and Queen Creek in the East Salt River Valley Sub-basin and to the southwest toward cones of depression in the Tonopah Desert and Centennial Wash area in the Hassayampa Sub-basin. 
  • In the West Salt River Valley sub-basin, the direction of groundwater flow originally was along the Salt and Gila Rivers into the Hassayampa Sub-basin.  Groundwater flow has been artificially modified toward cones of depression near Luke AFB and Deer Valley. 
  • In the Fountain Hills Sub-basin, groundwater flows to the south. (Not shown on map)
  • Groundwater flow in the Rainbow Valley Sub-basin is to the northwest, in the Lake Pleasant Sub-basin from north to south and in the Carefree Sub-basin to the west-southwest.

Well Yields

  • Refer to Table 8.1-6 and Figure 8.1-8
  • As shown on Figure 8.1-8, well yields are generally greater than 1,000 gpm. 
  • One source of well yield information, based on 2,397 reported wells, indicates that the median well yield is 1,280 gpm.

Natural Recharge

  • Refer to Table 8.1-6
  • Natural recharge in the Phoenix AMA is 24,100 acre-feet per year.
  • Mountain front and streambed recharge are the principal sources of natural recharge.

Water Level

  • Refer to Figure 8.1-6A-D. Water levels are shown for wells measured in 2002-2003.  Not all water level data shown on Figure 8.1-6 are shown on Figures 8.1-6A-B.
  • The Department annually measures 442 index wells in the AMA. Hydrographs for 20 index wells are shown on Figure 8.1-7
  • The deepest water level shown is 866 feet in the vicinity of Cave Creek and the shallowest is 10 feet in the vicinity of Superior.  Both wells are shown on Figure 8.1-6A.

Recharge Sites

  • Refer to Table 8.1-7 and Figure 8.1-9.
  • As of 2008 there were 43 active USFs and 10 GSFs.
  • Total permitted storage capacity for USFs is 962,000 acre-feet per year. 
  • Total permitted storage capacity for GSFs is 517,520.

Click here for Table 8.1-6

Table 8.1-6 Groundwater Conditions in the Phoenix AMA

Click here for Table 8.1-7

Table 8.1-7 Recharge Sites in the Phoenix AMA

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Figure 8.1-6 Phoenix AMA Groundwater Conditions

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Figure 8.1-6A East Salt River Valley, Fountain Hills and Carefree Sub-basins Groundwater Conditions

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Figure 8.1-6B Hassayampa Sub-basin Groundwater Conditions

Click here for Figure 8.1-6C

Figure 8.1-6C Rainbow Valley Sub-basin Groundwater Conditions

Click here for Figure 8.1-6D

Figure 8.1-6D West Salt River Valley/Lake Pleasent Sub-basins Groundwater Conditions

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Figure 8.1-7 Selected Hydrographs in the Phoenix AMA

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Figure 8.1-8 Phoenix AMA Well Yields

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Figure 8.1-9 Recharge Sites in the Phoenix AMA

 

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