The basics of the reliability theory of small settlements water supply systems were considered. Methods of the reliability calculation of the supply-distribution complex structures were reviewed: pumping stations, water pipes and branched network. The mathematical reliability model of the water supply technological process to the most distant consumers were constructed according to the water supply selected directions. The real possibility of water supply reliability calculation on an actual example was shown and a graphical representation of the results was performed.

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This article compares the operation of the existing water supply system in the city Kremenchuk, Poltava region, namely the giving-distributive complex (GDC), which includes the main water network and the pumping station of the 2-nd lift, with the GDC, in which the topological structure has been improved by introducing a new section of the network. During the operation of the GDC, the tasks of repairing or replacing pipes of individual sections the water network constantly arise. At the same time, attention should also be paid to the topological structure of the water network during its reconstruction. The need to improve the topological structure is clearly seen after performing hydraulic calculations and building piezometric maps. For comparison, piezometric maps need to build before and after the reconstruction of the water network. At the nodal points of the network, a geodetic mark, free pressure and piezometric mark are shown. Considering that water moves from a larger piezometric mark to a smaller one, the directions of water movement and water network nodes with minimal free pressures are determined. At the same time, flaws in the topological structure are found on the piezomap, which should be eliminated in order to increase its dependebility. It is known that dependebility includes 3 components: reliability, maintainability and durability. Durability is ensured by the choice of pipe material during design. If we take into account simultaneously reliability and maintainability, then a complex indicator should be used, namely, the availability factor Ka. It estimates the probability that at any given time the section of water network is in working condition. According to the topological structure, the water network of the city should be looped and have more connections between nodes. But in practice, this principle can not always be maintained, given the planning structure of the streets the city. Graphical representation of hydraulic calculations using piezomaps allows you to identify overloaded sections of the water network and increase its dependebility. When improving the topological structure, it is necessary to use the prof. Novokhatniy principle, namely, new sections must be introduced so that they unite the existing nodes of the existing water network. Hydraulic calculations have shown that by improving the topological structure of the water network the city Kremenchuk, the annual energy saving is about 452 thousand kWh, which corresponds to a saving of about UAH 2.7 million per year (at the cost of electricity 6 UAH per 1 kWh). Keywords: water supply system, giving-distributive complex, water network, topology, energy saving.

In systems of centralized water supply, the givining-distribution complex (GDC) has the highest cost, including pumping stations, water pipes and water supply networks: main, street, intra-quarter. The economic efficiency of the operation of this complex directly depends on the technical condition of the facilities and equipment. But over time, the technical characteristics of both pumping units and pipelines deteriorate due to wear. Therefore, it is necessary to periodically check their technical characteristics, as well as evaluate the topological characteristics of the water network in the process of its development. This requires regulatory documents and research by specialists in this field of technical sciences. This paper presents an example of such an approach for the givining-distribution complex of the water supply system the medium-sized city Borispol (65 thousand inhabitants) of the Kiev region. To set the throughput of the main water network, hydraulic calculations were performed on a computer using the HIDRO program. It has been established that the main water network has sufficient capacity, as evidenced by the constructed piezometric maps. It has been established that the topological structure of the water network is imperfect. To improve the structure, it is proposed to loop the network by introducing an additional section. This section is introduced in parallel to two existing dead-ends. This improvement made it possible to reduce the pressure at pumping stations by 2.4 m and obtain an annual energy saving of 19.57 thousand kWh. Due to the commissioning of an additional section, a new network ring was formed and the reliability of water supply to a number water consumers increased more than 5.6 times. The indicated increase in the reliability of water supply is due to the fact that this section is introduced in parallel with 2 existing dead-end sections.

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