STUDY ON DEVELOPMENT OF SEWER PIPE ANALYSIS MODEL CONSIDERING MANHOLE HEAD LOSSES

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Urban inundation has particularly been reported to lead to extensive property damage and casualties due to the concentration of people and properties in highly urbanized areas. The sewer system is one of the most important components of urban inundation analysis. The numerical simulation model developed for this study consists of a 1D slot model of sewer pipe flow, and estimates head loss between manhole and sewer pipes based on the rigid column theory. In order to obtain validation data, the fundamental laboratory experiments were conducted so as to estimate the effects of head loss depending on different manhole shapes with no benching and no invert. First, straight case experiments were conducted to evaluate the head loss with circular and square type manhole shapes under the steady state condition. Next, unsteady state experiments were conducted. Finally, a numerical simulation model was tested and validated to confirm the model갢s applicability in using head loss coefficients obtained from laboratory experiments. Simulation results demonstrated high agreement with experimental data, so the newly developed model can be used to analyze urban sewerage systems.