ABSTRACT
The second group includes approximation methods such as hydraulic, graphic and fragmentation of the groundwater flow. Hydraulic methods are based on the direct integration of the differential equation of Darcy or primarily adopted to the steady unidimensional filtration of groundwater flow. Direct problems are those in wnich the aim is to determine the quantitative values of the dynamic functions of the current of subsurface waters for known values of parameters of the geofiltration medium and the boundary conditions. A series of systematic hydrogeological assignments for solving the problem and a complete system of equations outlining mathematical conditions of its solution constitute the mathematical formulation of the problem. The important characteristic of differential equations is their universality in presenting the general patterns typical of the entire class of similar, analogous processes. Differential equations of radial planoradial filtration, characterising the flows of groundwater to the wells, are solved by using the theory of linear point flows in the plane or in space.
