Many contemporary books on hydrogeology are based on advanced mathematical
methods. Such an approach is needed for hydrology to develop further as a science.
However, hydrogeological surveys are normally performed in rather complicated
groundwater systems in which it may be difficult to define physical properties and
boundary conditions. At the same time the environmental features of each region
should be emphasized. In such cases deterministic and stochastic simulations have
proved to be satisfactory. A water balance approach in both types of simulation
provides very valuable information on the regional aspects of the solution.
C. C. Kisiel and L. Duckstein stated some years ago that " ... the future effort in
groundwater hydrogeology will transfer from theoretical approach to regional
specialised problems and simulation of complex systems". An application of the
system approach rules can help considerably in solving such regional problems.
The principles of the system approach in water resources management were formulated
by N. Buras and A. K. Biswas. Someone who is not familiar with water resources
survey on a regional scale, may consider the systems approach rules as trivial. It is
only when he attempts to follow some other approach that he will discover how
many problems arise.