Purpose: On the basis of methodological approaches to assessing the efficiency of operation of gravity drainage pipelines made of polymer materials with deposits in the tray part of pipes, to develop a sequence of hydraulic calculation of pipes with deposits and a methodology for evaluating the efficiency of their operation by the value of the hydraulic efficiency coefficient of the network. Methods: Based on the developed sequence of hydraulic calculation of drainage pipes made of polymer

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... ials with deposits in their tray part, establish the procedure for calculating the values of the actual characteristics of the hydraulic potential of polymer pipes, which allows calculating for the example given the value of the coefficient of hydraulic efficiency of network operation, according to which a decision is made on the possibility of continuing its further operation. Results: Analysis of the values of the hydraulic characteristics of new pipes and polymer pipes with deposits in their tray part, for the example given, allowed us to establish significant discrepancies in their values. This made it possible to calculate the value of the hydraulic efficiency coefficient of the pipeline to make a decision on the possibility of continuing further operation. Conclusion: For the specific conditions of the task, a sequence of hydraulic calculation of pipes made of polymer materials with deposits in their tray part has been developed. It is proposed to conduct special studies on pipes made of different types of materials with deposits in their tray part to establish acceptable values of the thickness of the sediment layer in the tray part of the pipes for subsequent assessment of the possibility of their further operation.