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Groundwater Conditions in the Bonita Creek 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 3.2-4. Figure 3.2-6 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 3.2-7 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 this basin see Bonita Creek Basin Hydrology.

Major Aquifers

  • Refer to Table 3.2-4 and Figure 3.2-6.
  • Major aquifers in the basin include recent stream alluvium, basin fill and volcanic rock.
  • Flow direction is generally from the northwest to the southeast.

Well Yields

  • Refer to Table 3.2-4 and Figure 3.2-7.
  • As shown on Figure 3.2-7 well yields in this basin range from less than 100 gallons per minute (gpm) to 2,000 gpm.
  • One source of well yield information, based on 14 reported wells, indicates that the median well yield in this basin is 1,144.5 gpm.

Natural Recharge

  • Refer to Table 3.2-4.
  • The only natural recharge estimate for this basin is 9,000 acre-feet per year (AFA). 

Water in Storage

  • Refer to Table 3.2-4.
  • There are three storage estimates for this basin, ranging from 1.0 million acre-feet (maf) to 2.0 maf.  The most recent estimate, from a 1994 ADWR study, indicates the basin has 1.3 maf in storage to a depth of 1,200 feet.

Water Level

  • Refer to Figure 3.2-6. Water levels are shown for wells measured in 2003-2004.
  • There are no index wells in this basin or recorded well sweeps 
  • There are three wells with water depth reported in 2003-2004.  Water level change data is not available.  All wells are near Bonita Creek in the extreme southern end of the basin with depth to water ranges from four feet to 12 feet.

Click to view Table 3.2-4

Click for Table 3.2-4 Groundwater Conditions in the

Bonita Creek Basin

Click to view Figure 3.2.-6

Click for Figure 3.2-6 Bonita Creek Basin

Groundwater Conditions

Click to view Figure 3.2-7

Click for Figure 3.2-7 Bonita Creek Basin

Well Yields


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