Major aquifers, well yields, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 7.5-5.  Figure 7.5-5 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 7.5-6 contains hydrographs for selected wells shown on Figure 7.5-5.  Figure 7.5-7 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. 

Major Aquifers

• Refer to Table 7.5-5 and Figure 7.5-5.
• The major aquifer in this basin is basin fill.
• Groundwater flow is toward two cones of depression, one in the Wenden/Salome area and the other in the Aguila area.

Well Yields

• Refer to Table 7.5-5 and Figure 7.5-7.
• As shown on Figure 7.5-7, well yields in this basin are generally between 1,000 and 2,000 gallons per minute (gpm). 
• One source of well yield information, based on 167 reported wells, indicates that the median well yield is 1,500 gpm.

Natural Recharge

• Refer to Table 7.5-5.
• The natural recharge estimate for this basin is 1,000 acre-feet per year (AFA).
• The only source of natural recharge is rainfall (ADWR 1994b).

Water in Storage

• Refer to Table 7.5-5.
• Estimates of water in storage for this basin range from 14 million acre-feet (maf) to 15.1 maf to a depth of 1,200 feet. 

Water Level

• Refer to Figure 7.5-5. Water levels are shown for wells measured in 2003-2004.
• The Department annually measures 25 index wells in this basin.  Hydrographs for eight index wells are shown on Figure 7.5-6. 
• The deepest water level shown on the map is 636 feet in the vicinity of Aguila and the shallowest is 29 feet west of Wenden.

Table 7.5-5 Groundwater Data for the McMullen Valley Basin

Figure 7.5-5 McMullen Valley Basin Groundwater Conditions

Figure 7.5-6 McMullen Valley Basin Hydrographs Showing Depth to Water in Selected Wells

Figure 7.5-7 McMullen Valley Basin Well Yields

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References and Supplemental Reading for the McMullen Valley Basin