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Groundwater Conditions in the Butler Valley Basin

Major aquifers, well yields, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 7.1-3.  Figure 7.1-5 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 7.1-6 contains hydrographs for selected wells shown on Figure 7.1-5.  Figure 7.1-7 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. 

Major Aquifers

  • Refer to Table 7.1-3 and Figure 7.1-5.
  • The major aquifer is basin fill.
  • Flow direction is from northeast to southwest generally following Cunningham Wash.

Well Yields

  • Refer to Table 7.1-3 and Figure 7.1-7.
  • As shown on Figure 7.1-7, well yields generally range from 1,000 gallons per minute (gpm) to greater than 2,000 gpm. 
  • One source of well yield information, based on 17 reported wells, indicates that the median well yield is 2,200 gpm.

Natural Recharge

  • Refer to Table 7.1-3.
  • Natural recharge estimates range from less than 1,000 acre-feet per year (AFA) to 1,060 AFA.

Water in Storage

  • Refer to Table 7.1-3.
  • Storage estimates for this basin range from 2.0 million acre-feet (maf) at a depth of 1,200 feet to 20 maf at a depth of 1,000 feet. 

Water Level

  • Refer to Figure 7.1-5. Water levels are shown for wells measured in 2003-2004.
  • The Department annually measures eleven index wells in this basin.  Hydrographs for three index wells are shown on Figure 7.1-6.
  • The deepest water level shown on the map is 514 feet west of Conley Ranch and the shallowest water level shown on the map is 86 feet near the southwestern basin boundary.

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Table 7.1-3 Groundwater Data for the Butler Valley Basin

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Figure 7.1-5 Butler Valley Basin Groundwater Conditions

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Figure 7.1-6 Butler Valley Basin Hydrographs Showing Depth to Water in Selected Wells

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Figure 7.1-7 Butler Valley Basin Well Yields


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