Acta Scientiarum Polonorum

While designing water supply networks, an important task consists in establishing the place necessary for an installation of water supply wells along with water supply units located in them, in aim to determine the number of structural elements in the composition of individual pipelines of this water supply network. It has been proposed to apply a methodology for predictive calculation of a number of structural elements of the water supply pipeline system by indirect signs. An improvement of this technique was carried out by systematising the structural elements into simple and complex ones, with the determination of an indicator of the structural device for each of them. In order to analyse the role of each structural element of the same type, belonging to an assembly consisting of a linear part of a pipeline and nodes, a concept of coefficient of constructiveness was introduced. Analytical and graphical dependencies for predicting the value of the coefficient of constructiveness have been obtained. For typical (simple) nodes, the minimum value of the coefficient of constructiveness is 1.3 and maximum value is 2.54. The largest value of the coefficient of constructiveness for a conventional (complex) node is 1.45, the minimum value is 1.13. Recommendations have been given for assessment of the complexity of the installation of water supply units in practice in the design of new and reconstruction of existing water supply networks. For the above water supply units, working chambers of a round shape are recommended, which makes it possible in practice to reduce the overall planned dimensions of a water well in comparison with a rectangular shape of the same chamber.