A feature of combined irrigation systems is the integration of various technologies and methods of irrigation with the implementation of such a possibility on the basis of a single technical system. The hydraulic calculation of such systems is more complicated, since it is assumed that it is possible to implement various modes of operation, which differ by the combination of hydraulic parameters. The operating modes are determined by the combination of the involved irrigation technologies carried out simultaneously. The research has proposed an algorithm for the computer simulation of combined irrigation systems hydraulic parameters. The algorithm implements the principle of step-by-step calculation and formation of statistical screenshots of the hydraulic parameters of the system based on the basic calculated dependencies of classical hydraulics. Static screens can be performed at any time interval, which allows to assess the dynamics of the process under changing external conditions, as well as study the system under different operating modes. The algorithm has built an ingenious system of objects identification, making it possible not only to verify the uniquely defined knots of stems section, but also to organize serial search nodal points in accordance with the architecture of the construction of hydro-reclamation systems.