ABSTRACT

It is not practical to develop a general solution which is applicable for all time following the start of pumping. However, solutions have been developed for both early and late time periods.

impermeable aquitards, defined as when t < 10K' and t < 10K" (Hantush, 1960 and 1964). Under these conditions, drawdown is given by

s =iJrH(u, P> (10.15)

where

(10.16)

Chapter 10

and

ico e-y [ p..JU J H(u,P)= -erfc dy u Y ..Jy (y-u)

where erfc(x) is the complimentary error function defined by

which may be approximated by

(10.17)

(10.18)

(10.19)

(10.20)

Values of the function H(u, p) are given in Table 10.1. Values ofH(u, p) may also be computed with the program TYPE5; drawdown can be computed with the computer program DRA W5 (Appendix B).