Investigation of Two Manhole Inflow Collection Methods on Surface Runoff and Storm Sewer Hydraulics in Urban Areas

• Main Authors: Kuan-Wen Chen, 陳冠文
• Other Authors: Tsang-Jung Chang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/92533896328685649664

碩士 === 國立臺灣大學 === 生物環境系統工程學研究所 === 103 === Recently, heavy rainfall owing to extreme precipitation events gives significant impact on the capacity of storm sewer systems in metropolises and thus inundation which will cause damage to homes and businesses occurs frequently. To prevent inundation or to reduce the damage resulted from it, a high-accuracy simulation tool is necessary to be developed.Therefore, we aim at analyzing the performance of two manhole inflow collection methods, including Method A: rainwater into storm sewers viamanholes and Method B: rainwater into storm sewers via street gutters in addition to manholes, are respectively incorporated into 1D storm sewer model. Here, the drainage basin of Chung Kang storm sewer system in Mucha,Taipei, Taiwan is adopted as the study area. Coupled with 2D flood inundation model, overland flows and storm sewer flows caused by two heavy rainfall events are predicted using the two 1D/2D coupled models. Compared to the measure data of inundation areas and sewer water levels, it can be found that inundation areas are overestimated while storm sewer levels are underestimated using the Method A. In contrast, the simulated results based on the Method B are more consistent with the measured data.To sum up, it can be demonstrated that the Model B containing the storm sewer and street gutter systems is capable of predicting overland flows and storm sewer flows caused by heavy rainfall more accurately.