3 August 1998
Figure 5-4 shows the relationship of the terms used in the following formula for available yield
from an artesian well:
Figure 5-4. Diagram of well in artesian aquifer.
c. Determination of Values. The well driller's log provides the dimensions of H, h, and b.
The value of R usually lies between 100 and 10,000 feet. It may be determined from
observation wells or estimated. K may be determined from laboratory tests or field tests. A
pumping test and observation wells may provide the values for all of these equations. Figure
5-3 shows the values for calculating K in water table aquifer:
1055 Q log (r2/r1)