Major aquifers, well yields, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 7.6-6.  Figure 7.6-6 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 7.6-7 contains hydrographs for selected wells shown on Figure 7.6-6.  Figure 7.6-8 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 7.6-6 and Figure 7.6-6.
• The major aquifer is recent stream alluvium and sedimentary rock (Bouse Formation).
• Groundwater flow is from the south and east toward the Colorado River.

Well Yields

• Refer to Table 7.6-6 and Figure 7.6-8.
• As shown on Figure 7.6-8, well yields are generally less than 100 gallons per minute (gpm) although higher well yields are found near the Colorado River.
• One source of well yield information, based on 75 reported wells, indicates that the median well yield is 100 gpm.

Natural Recharge

• Refer to Table 7.6-6.
• The natural recharge estimate for this basin is 241,000 acre-feet per year (AFA).
• The largest source of natural recharge is the Colorado River (ADWR 1994).

Water in Storage

• Refer to Table 7.6-6.
• Storage estimates for this basin range from 14 million acre-feet (maf) to 24 maf to a depth of 1,200 feet. 

Water Level

• Refer to Figure 7.6-6. Water levels are shown for wells measured in 2003-2004.
• The Department annually measures six index wells in this basin.  Hydrographs for five of these wells and two additional wells (B and G) are shown on Figure 7.6-7. 
• The deepest water level shown on the map is 553 feet north of Quartzsite and the shallowest is 10 feet west of the Cibola Ehrenberg Road near the Colorado River.

Table 7.6-6 Groundwater Data for the Parker Basin

Figure 7.6-6 Parker Basin Groundwater Conditions

Figure 7.6-7 Parker Basin Hydrographs Showing Depth to Water in Selected Wells

Figure 7.6-8 Parker Basin Well Yields

Arizona Water Atlas Home

Lower Colorado River Planning Area Home

References and Supplemental Reading for the Parker Basin