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Securing Arizona's Water Future
Groundwater Conditions in the San Bernardino Valley Basin

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 3.11-3.  Figure 3.11-6 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 3.11-7 contains hydrographs for selected wells shown on Figure 3.11-6.  Figure 3.11-8 shows well yields in three 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 San Bernardino Valley Basin Hydrology.

Major Aquifers

  • The major aquifers in the basin are recent stream alluvium and volcanic rock.
  • Artesian wells and springs support wetlands in this basin near the border with Mexico.
  • Flow direction is generally from the north to the south.

Well Yields

  • As shown on Figure 3.11-8 well yields in this basin range from less than 100 gallons per minute (gpm) to 1,000 gpm.
  • One source of well yield information, based on three reported wells, indicates that the median well yield in this basin is 450 gpm, however the range is quite large, 22-600 gpm.

Natural Recharge

  • Refer to Table 3.11-3.
  • The natural recharge estimate for this basin is 9,000 acre-feet per year (AFA).

Water in Storage

  • Refer to Table 3.11-3.
  • Storage estimates for this basin range from 1.6 million acre-feet (maf) to 2.0 maf to a depth of 1,200 feet. 

Water Level

  • Refer to Figure 3.11-6.  Water levels are shown for wells measured in 2003-2004.
  • The Department annually measures four index wells in this basin.  Hydrographs for two of these wells are shown in Figure 3.11-7. More recent hydrographs of the index wells may be available through the Department's GWSI webpage
  • Depth to water was measured for three wells in this basin in 2003-2004 and varies from 612 feet in the north central portion of the basin to 30 feet along the border with Mexico.

Click to view Table 3.11-3

Click to view Table 3.11-3 Groundwater Data for the San Bernardino Valley Basin

Click to view Figure 3.11-6

Click to view Figure 3.11-6 San Bernardino Valley Basin Groundwater Conditions

Click to view Figure 3.11-7

Click to view Figure 3.11-7 San Bernardino Valley Basin Hydrographs Showing Depth to Water in Selected Wells

Click to view Figure 3.11-8

Click to view Figure 3.11-8 San Bernardino Valley Basin Well Yields

 

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