Fundamental questions connected with the modelling of communal sewage networks have been
considered and formulas used to model the functioning of the basic network have been analyzed. The
problem described concerns gravitational sewage networks divided by nodes into branches and sectors. Simulation
of the steady state functioning of sewage networks is commonly carried out on the basis of nomograms
in the form of charts, in which the relations between network parameters like channel diameters, flow rates,
hydraulic slopes and flow velocities are described. In traditional design, the values of such parameters are
simply read from such nomogram chart tables. Another way of simulating the functioning of a network is the
use of professional software, like SWMM, that models sewage flows along the channels by means of differential
equations describing the movement of fluids. In both approaches, the user is a mechanical operator of
a “black box” procedure. In this paper, another way of simulating the functioning of sewage net-works has
been presented. Numerical solutions of nonlinear equations describing the physical phenomena of sewage
flows are applied and explained. The presented algorithms were developed to model the steady state of a sewage
network enabling a quick analysis of the network parameters and the possibility of fast, simple and comprehensible
network modeling and design.
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