A Study on the Capacity of Storm Sewer for Flooding

Abstract

In recent years due to an increase in the urban population the corresponding housing demand has led to an increase in building construction These countless building construction projects have increased the amount of impervious surface areas which in turn has led to an increase in surface runoff In order to ensure public safety and protect urban areas the sewers in urban areas are particularly important Generally speaking the design standard for sewers in urban areas is approximately a return period of 2 to 10 years Therefore flooding in sewer leads to a risk of surcharge However current simulations of sewer systems such as SWMM MOUSE and ISS only consider open channel conditions As a result this study is intended to explore storm sewer flooding capacity A storm sewer model is developed that considers both open channel and pipe flow conditions based on the assumption of steady flow An experiment is conducted and the pipe flow theory is discussed in an effort to determine the relationship between pressure head and discharge and then to predict the pressure head when storm sewers approaches surcharge situations The results show that a conflict between the experimental results and the pipe flow theory In addition the relationship between the pressure head and the discharge exhibits a power function

Date of Award	2020
Original language	English
Supervisor	Wei-Cheng Lo (Supervisor)