ABSTRACT
To compute the average drawdown in an observation well, Save. Equation 11.7 must be integrated between the screened depths z = <io and z = 10 and divided by the screen length (10 - d0 ). The result is
where
2m2 ~ 1 [ . (n1tl) . (n1td)~ f(u, X, 1/m, d/m, lJm, dJm) = 1t(l-d) Uo-do) n~ n2 sm m - sm m u
For convenience, Equation 11.12 can be written as
(11.13)
(11.14)
Values of the function W(panial penetration) can be computed with the computer program TYPE6; average drawdown can be computed with the computer program DRA W6 (Appendix B).
