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Securing Arizona's Water Future
Groundwater Conditions in the Morenci Basin

Major aquifers, well yields, estimated natural recharge, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 3.9-6.  Figure 3.9-7 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 3.9-8 contains hydrographs for selected wells shown on Figure 3.9-7.  Figure 3.9-9 shows well yields in five yield categories.  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.  For more information on groundwater in the basin see Morenci Basin Hydrology.

Major Aquifers

  • The major aquifers in this basin are recent stream alluvium and volcanic rock.
  • Flow direction is generally from north to south.

Well Yields

  • As shown on Figure 3.9-9 well yields in this basin range from less than 100 gallons per minute (gpm) to more than 2,000 gpm.
  • One source of well yield information, based on 53 reported wells, indicates that the median well yield in this basin is 600 gpm.

Natural Recharge

  • Refer to Table 3.9-6.
  • The only natural recharge estimate in this basin is 15,000 acre-feet per year (AFA).

Water in Storage

  • Refer to Table 3.9-6.
  • The only storage estimate is three million acre-feet to a depth of 1,200 feet.

Water Level

  • Refer to Figure 3.9-7.  Water levels are shown for wells measured in 2003-2004.
  • The Department annually measures four index wells in this basin.  A hydrograph for one of these two wells is shown in Figure 3.9-8.  More recent hydrographs of the index wells may be available through the Department's GWSI webpage.
  • The deepest recorded water level in the basin in 2003-2004 is 78 feet and the shallowest is eight feet.  All recorded water level changes are in the vicinity of Alpine.

Click to view Table 3.9-6

Click to view Table 3.9-6 Groundwater Conditions

in the Morenci Basin

Click to view Figure 3.9-7

Click to view Figure 3.9-7 Morenci Basin

Groundwater Conditions

Click to view Figure 3.9-8

Click to view Figure 3.9-8 Morenci Basin Hydrographs Showing Depth to Water in Selected Wells

Click to view Figure 3.9-9

Click to view Figure 3.9-9 Morenci Basin

Well Yields

 

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