Review article

The problems of hydraulic calculations of transport facilities include a number of accepted assumptions in the methodology developed in the last century and affecting the reliability of the results obtained. Despite the large number of publications on this subject, there are virtually no studies to assess the degree of influence of these assumptions on the reliability of hydraulic calculations of networks and reservoirs of surface runoff disposal systems. The results of the study of the flow rates in the final section of the collector, obtained using the method of limiting intensities and according to the hydraulic model, show their convergence under the condition of a continuous uniform increase in the surface runoff areas. Consequently, it was found out that in case of uniform discrete growth of runoff areas, application of the method of limiting intensities leads to underestimation of calculated discharges by 15-20%. In the case of non-uniform discrete growth, the calculation error can increase significantly. With an uneven discrete growth, the calculation error can increase significantly. The obtained results contribute to the issues of updating the methodology of hydraulic calculations of transport facilities of surface runoff drainage systems.