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Securing Arizona's Water Future
Groundwater Conditions in the Bill Williams 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 4.2-6.  Figure 4.2-6 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 4.2-7 contains hydrographs for selected wells shown on Figure 4.2-6.  Figure 4.2-8 shows well yields in five 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 4.2-6 and Figure 4.2-6.
  • Major aquifers in the basin include recent stream alluvium, basin fill and volcanic rock.

  • This basin contains five sub-basins, Clara Peak in the west, Alamo Reservoir in the center of the basin, Burro Creek in the northeast, Santa Maria in the central east and Skull Valley in the east.

  • In general the principal water-bearing aquifer is the basin fill, however, the recent stream alluvium is the main water-bearing aquifer in the Peeples Valley area, in the Skull Valley Sub-basin.

  • Flow direction varies.

Well Yields

  • Refer to Table 4.2-6 and Figure 4.2-8.
  • As shown on Figure 4.2-8 well yields in this basin range from less than 100 gallons per minute (gpm) to greater than 2,000 gpm.

  • One source of well yield information, based on 195 reported wells, indicates that the median well yield in this basin is 280 gpm.

  • Well yields vary throughout the basin with the majority of the highest well yields, greater than 2,000 gpm, occurring in the western portion of the basin along the Bill Williams River.

Natural Recharge

  • Refer to Table 4.2-6.
  • The estimate of natural recharge for this basin is 32,000 acre-feet per year.

Water in Storage

  • Refer to Table 4.2-6.
  • Storage estimates for this basin range from 10 million acre-feet (maf) to 23 maf to a depth of 1,200 feet

Water Level

  • Refer to Figure 4.2-6. Water levels are shown for wells measured in 2003-2004.
  • The Department annually measures 24 index wells in this basin.  Hydrographs for four of these wells are shown on Figure 4.2-7.
  • The deepest recorded water level in the basin is 642 feet in Yavapai County east of the La Paz County line and the shallowest is five feet north of Peeples Valley.  This is the shallowest recorded water level in the planning area.

Click to view Table 4.2-6

Click to view Table 4.2-6 Groundwater Data for the Bill Williams Basin

Click to view Figure 4.2-6

Click to view Figure 4.2-6 Bill Williams Basin Groundwater Conditions

Click to view Figure 4.2-7

Click to view Figure 4.2-7 Bill Williams Basin Hydrographs Showing Depth to Water in Selected Wells

Click to view Figure 4.2-8

Click to view Figure 4.2-8 Bill Williams

Basin Well Yields

 

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