Major aquifers, well yields, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 7.9-4.  Figure 7.9-6 shows aquifer flow direction. Data on water-level change between 1990-1991 and 2003-2004 was not available for this basin.  Figure 7.9-7 contains hydrographs for selected wells shown on Figure 7.9-6.   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 7.9-4 and Figure 7.9-6.
• The major aquifer in this basin is basin fill.
• Groundwater flow is generally to the north and south away from the center of the basin.

Well Yields

• Refer to Table 7.9-4.
• The only well yield data available indicates a well yield ranges from dry to 500 gallons per minute (gpm).

Natural Recharge

• Refer to Table 7.9-4.
• The natural recharge estimate for this basin is less than 1,000 acre-feet per year (AFA).

Water in Storage

• Refer to Table 7.9-4.
• Storage estimates range from 700,000 acre-feet to 2.0 million acre-feet to a depth of 1,200 feet. 

Water Level

• Refer to Figure 7.9-6.
• The Department annually measures two index wells in this basin. Hydrographs for these index wells are shown on Figure 7.9-7. 

Table 7.9-4 Groundwater Conditions for the Tiger Wash Basin

Figure 7.9-6 Tiger Wash Basin Groundwater Conditions

Figure 7.9-7 Tiger Wash Basin Hydrographs Showing Depth to Water in Selected Wells

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References and Supplemental Reading for the Tiger Wash Basin