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Groundwater Conditions in the Grand Wash Basin

Major aquifers, well yields, number of index wells and date of last water-level sweep are shown in Table 6.2-3.  Figure 6.2-6 shows water-level change between 1990-1991 and 2003-2004.  Figure 6.2-7 contains hydrographs for selected wells shown on Figure 6.2-6.  Figure 6.2-8 shows well yield for one well.  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

  • Major aquifers in the basin include recent stream alluvium, basin-fill and sedimentary rock (Cottonwood Wash and Muddy Creek formations).

  • Most of the basin geology consists of consolidated crystalline and sedimentary rock.

  • Data on natural recharge, groundwater in storage and groundwater flow direction is not available for this basin.

Well Yields

  • As shown on Figure 6.2-8 well yield data are only available for one well, which yields less than 100 gallons per minute (gpm).

Water Level

  • Refer to Figure 6.2-6. Water levels are shown for wells measured in 2003-2004.
  • The Department annually measures two index wells in this basin. Hydrographs for these two wells are shown on Figure 6.2-7. More recent hydrographs of the index wells may be available through the Department's GWSI webpage.
  • The water level in one well was at a depth of 21 feet and rose by more than 30 feet between 1990-1991 and 2003-2004.  Water level in the other well is at a depth of 508 feet and was generally stable between 1990-1991 and 2003-2004.




Click to view Table 6.2-3

Click to view Table 6.2-3 Groundwater Data for the

Grand Wash Basin

Click to view Figure 6.2-6

Click to view Figure 6.2-6 Grand Wash Basin

Groundwater Conditions

Click to view Figure 6.2-7

Click to view Figure 6.2-7 Grand Wash Basin Hydrographs

Showing Depth to Water in Selected Wells

Click to view Figure 6.2-8

Click to view Figure 6.2-8 Grand Wash Basin

Well Yields



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