Major aquifers, well yields, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 7.8-5.  Figure 7.8-5 shows aquifer flow direction, data on water-level change between 1990-1991 and 2003-2004 was not available for this basin.  Figure 7.8-6 shows well yields in two 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 7.8-5 and Figure 7.8-5
• The major aquifer in this basin is basin fill.
• Groundwater flow is generally from east and north to south.

Well Yields

• Refer to Table 7.8-5 and Figure 7.8-6
• Well yield data are only available for two wells located in the vicinity of the international boundary.

Natural Recharge

• Refer to Table 7.8-5
• The natural recharge estimate is 11,000 acre-feet per year (AFA).

Water in Storage

• Refer to Table 7.8-5
• Storage estimates range from 6.7 million acre-feet (maf) to 45 maf to a depth of 1,200 feet. 

Table 7.8-5 Groundwater Conditions for the San Simon Wash Basin

Figure 7.8-5 San Simon Wash Basin Groundwater Conditions

Figure 7.8-6 San Simon Wash Basin Well Yields

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References and Supplemental Reading for the San Simon Wash Basin