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

• Refer to Table 4.9-6 and Figure 4.9-6.
• 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

• Refer to Table 4.9-6 and Figure 4.9-8.
• 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 for Figure 4.9-6 Sacramento Valley Basin

Groundwater Conditions

Click for Figure 4.9-7 Sacramento Valley Basin

Hydrographs Showing Depth to Water in Selected Wells

Click for Figure 4.9-8 Sacramento Valley Basin Well Yields

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