Flow Forecasting of a Huge Drainage Pipeline

Abstract

This paper aimed to establish the flow forecasting model of huge drainage pipelines in the municipal drainage system. In the experiment, the targeted drainage pipeline was 3740 m in length, 11 years in service age, and 2.8 m × 2.8 m in flow section; TC junction well and M2 forebay were at its upstream and downstream nodes, respectively. Because no flow measuring facilities were at the pipeline, and the downstream M2 drainage pump station could not run effectively, the use of on-site water levels of pipeline nodes to forecast its flow in real time was explored. During the modeling, the node energy equation and flow regulating equation are used; water levels of TC junction well and M2 forebay, the inflow and outflow of M2 forebay were collected. At last, a restricted flow predicating model with the flow relative error of 15% and Reynolds number of (4 ~ 9) × 105 was produced, which is only related to the head difference of the pipeline nodes. Accordingly, the liquid level gauges of the TC junction well and M2 forebay were kept permanently and the flow forecasting model was adopted by the downstream M2 drainage pump station.