TM 5-815-5/AFM 88-5, Chap 6/NAVFAC P-418
(Modified from "Ground Water Hydrology" by D. K. Todd, 1959, Wiley & Sons,
Inc. Used with permission of Wiley & Sons, Inc.)
Figure C-9. Method 2 for solution of the nonequilibrium equation.
drawdown in feet per log cycle of time.
mine corresponding W(u) and u from figure C-10.
Step 5. Determine the formation constants by
equations (C-3) and (C-4).
(3) Method 3. This method can be used as an ap-
proximate solution for nonequilibrium flow to a well if
the time-drawdown curve plotted to a semilog scale be-
comes a straight line (fig. C-6). The formation con-
stants (T' and S) can be computed from
(C-7)
and
(From "Ground Water Hydrology" by D. K. Todd, 1959, Wiley & Sons. Inc.
Used with permission of Wiley & Sons, Inc.)
(C-8)
Figure C-10. Relation among F(u), W(u), and u.
C-10
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