الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
INTRODUCTION
In principle, three classes of methods exist for solving
the problems of forecasting water flow in ground. These three
methods are:-
(a) Analytical methods.
(b) Methods based on the use of models and analogs.
(c) Numerical methods.
Analytic::al methods are superior to any of the other ones and
should be used whenever possible. But unfortunately, in most
regional studies of practical interest an analytical solution is
not possible, n~,ainly because of the irregular! ty of the shape of
aquifer boundaries. Further11,c,re, in most cases, the considered
aquifer flow domain is inhomogeneous with respect to its
storativity and transmissivity and the spatial distributions of
these poranJ...:;ters cannot tt: [..-.Lt:st:nted in the form of anc2.ytical
expressions. This is true fer ini Lial cc..ndi tions as well as for
various i~~~t~ and outpL~~ (natural repien1stment, artificial
recharge, aJ.~ pu~ping).
Analog ~e:~:ds rr.ay be rega~d~j 65 specia2 ~urpose computers, when
ccmpared to digital comp~ters. An analcg is usually constructed
to solve a particular flow probJ..em, on the condition t..Lat the
geo111etry and parameters or an aquifer remain unchanged. The flow
through porous media can be studied by means of the following
models a11d ~nalogs:-
(a) Sand box model.
(b) V0rtical and horizontal Hele-Show analogs.
(c) E”ectric analogs c.f the electrolytic tank type, of the