| Summary: | 碩士 === 中華科技大學 === 土木防災工程研究所 === 99 === Xizhi has always been known as a place of flood. Situated within the path where typhoons often occur, the impression that flooding never ceases in Taiwan stays with the public. Confronted by global changes in the environment, the frequency of typhoon with its precipitation has brought several major disasters. For reducing the occurrence of flooding, dikes shall be heightened and pump stations shall be increased. In addition, the underground sewer system should also be utilized in conjunction with pump stations as ways to discharge waters out of dikes. Other than natural factors such as precipitation level, human factors are more severe to the cause of flooding disasters.
Flooding disaster events from 1987 to 2011 were analyzed by the study, it was found that the majority of disasters 75% are due to malfunctions of facilities such as pump stations and underground sewers. Using the most disastrous case of Typhoon Nari and the flooding case near Keelung as examples, the study analyzes the risk control strategy and response when underground sewer systems are used in conjunction with pump stations. From risk assessment, the result showed that human cause to the malfunction of pump stations is the primary reason 60% of flooding disaster. Human cause to the ineffectiveness of drainage ranks second, at 25%.
The study quantifies the risk factor in the two flooding cases of Typhoon Nari and Keelung downpour. The cases were graded as H16 which means unacceptable and requires immediate improvement. Through the analysis of risk reducing strategy, it was found that flooding disaster could be reduced by more than 50% if risk factors of pump station malfunction and faulty human operation are reduced, which means M8 grading for impending review and L3 grading for acceptable. For comprehensive consideration, operation procedure and specialized management can be review further in the study. The findings may be provided to government agencies for references to the management of underground sewers and pump stations so that the threat of human lives and properties is reduced in the event of typhoons and downpours, thereby benefiting the public.
Keywords: Rain Water Sewer, Flood Pumping Station, Risk Management, Risk Quantification Model
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