TM 5-818-5/AFM 88-5, Chap 6/NAVFAC P-418
E Q U A T I O N S F O R F L O W A N D DRAWDOWN F O R A F U L L Y P E N E T R A T I N G W E L L W I T H A L I N E S O U R C E O F
INFINITE LENGTH WERE DEVELOPED UTILIZING THE METHOD OF IMAGE WELLS. THE IMAGE WELL
IS CONSTRUCTED AS SHOWN IN (a) BELOW.
IN THE EQUATIONS ABOVE, THE DISTANCE TO THE LINE SOURCE MUST BE COMPARED TO THE
CIRCULAR RADIUS OF INFLUENCE, R, FOR THE WELL. IF 2L IS GREATER THAN R, THE WELL
WILL PERFORM AS IF SUPPLIED BY A CIRCULAR SOURCE OF SEEPAGE, AND SOLUTIONS FOR A LINE
SOURCE OF SEEPAGE ARE NOT APPLICABLE.
SEE FIG. 4-23 FOR DETERMINING THE VALUE OF R.
S E E F I G . 4 - 2 4 F O R D E T E R M I N I N G T H E V A L U E O F H w.
(Modified from "Foundation Engineering," G. A, Leonards, ed., 1962. McGraw-Hill
Book Company. Used with permission of McGraw-Hill Book Company.)
Figure 4-17. Flow and drawdown for fully penetrating single well; line source; artesian and gravity flows.
4-18
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