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Groundwater Conditions in the Sacramento 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 4.9-6.  Figure 4.9-6 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 4.9-7 contains hydrographs for selected wells shown on Figure 4.9-6.  Figure 4.9-8 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 this basin click here.

Major Aquifers

  • The major aquifer in this basin is basin fill.
  • Flow direction is from the north to the south in the northern portion of the basin and east to west in the southern portion of the basin.

Well Yields

  • As shown on Figure 4.9-8 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 36 reported wells, indicates that the median well yield in this basin is 100 gpm.

Natural Recharge

  • Refer to Table 4.9-6.
  • Natural recharge estimates range from 1,000 acre-feet per year (AFA) to 4,000 AFA.
  • Most of the recharge in this basin comes from infiltration along the mountain fronts.

Water in Storage

  • Refer to Table 4.9-6.
  • Storage estimates for this basin range from 3.6 million acre-feet (maf) to 1,500 feet to 14 maf to 1,200 feet.  

Water Level

  • Refer to Figure 4.9-6. Water levels are shown for wells measured in 2003-2004.
  • The Department annually measures 16 index wells in this basin.  Hydrographs for three index wells (A,D and E) and two other wells are shown in Figure 4.9-7.
  • The Department measures water levels four times daily at two automated groundwater monitoring site in  the north-central portion of the basin.   Information on the index wells and automated groundwater sites in this basin can be accessed through the Department's GWSI webpage.
  • These data show the deepest recorded water level in the basin is 1,062 feet west of Kingman  and the shallowest is 38 feet east of Topock.

Click to view Table 4.9-6

Click for Table 4.9-6 Groundwater Data for the

Sacramento Valley Basin

Click to view Figure 4.9-6

Click for Figure 4.9-6 Sacramento Valley Basin

Groundwater Conditions

Click to view Figure 4.9-7

Click for Figure 4.9-7 Sacramento Valley Basin

Hydrographs Showing Depth to Water in Selected Wells

Click to view Figure 4.9-8

Click for Figure 4.9-8 Sacramento Valley Basin Well Yields


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