Evaluation of the Impact of Transit Flow Rate on the Distribution Drainage Pipelines Characteristics

Abstract

The method of calculating the error that occurs when determining the flow rate in the initial section of the pressure distribution drainage pipeline when it passes transit flow rate is proposed in the paper. It is based on the analysis of differential equations describing the fluid motion with variable flow rate in such pipelines. The analysis is presented in dimensionless form. The impact of transit flow on the main flow is estimated using the values of the drainage pipeline resistance coefficient ζl and the generalized parameter of the perforated drain A, which takes into account its constructive and filtration characteristics. The proposed method allows to perform calculations of drainage pipelines that operate in the presence of transit flow rate, according to the method of these pipes calculation that distribute water without passing transit flow. Herewith, the possible error, which includes in the calculation results, determines. To illustrate the obtained dependences, the corresponding graphs are given in the paper. The results of the analysis allow to determine the limits within which a simplified method of calculating the distribution drainage pipelines can be used and the error, that occurs, can be estimated.