The article discusses the methods of maintenance and technical diagnostics of large vertical pumping units of modernized pumping stations of the largest cascades of the Amu-Bukhara and Karshi channels to ensure reliability during their operation, assesses the qualitative and quantitative changes in their modes. The operation of large pumping stations poses a number of problems that cannot be solved without experimental studies. The aim of the research is the problem of comprehensive diagnostics of pumping units and the development of new export-oriented diagnostic devices. The use of new designs of pumping power and diagnostic equipment involves the use of mathematical modeling of control of the operating modes of machine channels, which gives significant savings. Methods of accounting for cavitation – hydroabrasive wear of the blades are based on the study of the movement of the hydroabrasive flow along the radius of the impeller. Recommended elimination of pump operating modes with a maximum wear rate of their parts.

Research is carried out for design institutes in which the structures of pumping stations are designed. In the regional conditions of the Republic of Uzbekistan, when operating pumping stations, the problem of protecting equipment from pumps and fin is of particular importance, as well as the stability of water supply structures and the creation of favorable hydraulic conditions for supplying flow to the pumps. The main factors in the flow conditions are the calculations associated with suspended particles. The purpose of the research was to study the kinematics of the flow of intake structures in the problem of protecting equipment from pumps and fin. The research subject was to identify the regularities of the operation of intake structures depending on the structure of the flow supply. Experimental methods of hydraulic research of intake structures of pumping stations are used in the work. The analysis of the current state of water supply to the intake structures of pumping stations is carried out based on calculation schemes, which make it possible to establish the nature of the influence of flow parameters and soil particles on this process.

This paper reports on the results obtained the priority recommended strategy for carrying out reconstructive work aimed of the reliability control and safety of Jizzakh main pumping station. It has been established that the safe operation level of Jizzakh main pumping station is supported under the following conditions: The watermark in the pump station forebay are not lower than 314.55 and watermark in the headpond is not higher than 337.80 and not lower than 336.90 for the main units. At the station, no more than 5 “main” and 2 “subsidiary” units work, one “main” unit must be constantly in reserve.

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The main problem in the operation of irrigation systems is to ensure the accuracy and reliability of measuring the main hydrometric parameters in managing water resources of irrigation facilities. When operating systems with pumping stations, it becomes necessary to measure a set of technological parameters, which can be divided into the following groups by type: hydraulic parameters (flow rate, fluid pressure, water flow in the channel), parameters of pumping units, linear-angular parameters (channel section length, channel width, gate movement, mixed parameters (clear area, flow depth, wetted perimeter length). Analysis of existing methods and instruments for measuring water flow for the rational use of water resources is used in all areas the volume of water taken from the water intake and supplied to the irrigation network. This task contributes to operational and control of pumping station parameters without hydrometric instruments at the stations themselves. The problem of organizing automated technological accounting of irrigation water at graduated hydraulic structures equipped with gates and operating in a flooded or backwater-variable mode is solved by new hydrometric methods with the integrated use of ultrasonic, acoustic, or float level gauges as part of modern microprocessor devices that convert water level readings at such structures into flow and runoff readings, according to the calibration characteristic each specific building. The article presents the recommended water metering devices for different hydraulic flow regimes and water quality. To speed up the process of measuring water flow in canals with flow rates of 1-10 m3 / s and large facilities of pumping stations with flow rates of 10-200 m3 / s, types of standard weirs, flumes of various profiles, and water measuring nozzles are recommended. According to the working formulas, changes in water flow are determined, taking into account the error of the gauging station and the indicated weirs.