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 3.6-6. Figure 3.6-6 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 3.6-7 contains hydrographs for selected wells shown on Figure 3.6-6. Figure 3.6-8 shows well yields in four 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 Dripping Springs Wash Basin Hydrology.

Major Aquifers

• Refer to Table 3.6-6 and Figure 3.6-6.
• The major aquifers in the basin are recent stream alluvium, consisting of mostly sand and silt, and Gila Conglomerate sedimentary rock.  The recent stream alluvium is the principal water-producing unit.
• Flow direction is generally from the northwest to the southeast.

Well Yields

• Refer to Table 3.6-6 and Figure 3.6-8.

• As shown on Figure 3.6-8 well yields in this basin range from less than 100 gpm to 2,000 gpm.

• One source of well yield information, based on 12 reported wells, indicates that the median well yield in this basin is 394.5 gpm.

Natural Recharge

• Refer to Table 3.6-6.
• Natural recharge estimates range from 3,000 acre-feet per year (AFA) to 9,000 AFA.

Water in Storage

• Refer to Table 3.6-6.

• Storage estimates for this basin range from 150,000 acre-feet to less than 1.0 million acre-feet to a depth of 1,200 feet. 

Water Level

• Refer to Figure 3.6-6.  Water levels are shown for wells measured in 2003-2004.
• The Department annually measures two index wells in this basin.  A hydrograph for one of these wells is shown in Figure 3.6-7.  More recent hydrographs of this and other index wells may be available through the Department's GWSI webpage.
• There are only two water levels recorded in this basin during 2003-2004.  The wells are close to each other and measure 87 feet and 98 feet to water. Water levels in both declined one to 15 feet between 1990-1991 and 2003-2004.

Click to view Table 3.6-6 Groundwater Data for the

Dripping Springs Wash Basin

Click to view Figure 3.6-6 Dripping Springs Wash Basin Groundwater Conditions

Click to view Figure 3.6-7 Dripping Springs Wash Basin Hydrographs Showing Depth to Water in Selected Wells

Click to view Figure 3.6-8 Dripping Springs Wash Basin

Well Yields

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