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Experimental Study on Validation of Discharge Coefficient Between the Ground Surface and Sewerage System

Author(s): Seungsoo Lee; Hajime Nakagawa; Kenji Kawaike; Hao Zhang

Linked Author(s): Kenji Kawaike, Hajime Nakagawa

Keywords: No Keywords

Abstract: Recently, scientists have developed many numerical models to predict of urban inundation damage due to climate change and heavy rainfall by using the combined sewer system. The sewer system is one of the most important factors in urban flood inundation models, and the inlet discharge through storm drains is also very important input data in a sewer system. However, it is very difficult to estimate how much discharge on the ground surface is drained through storm drains. In addition, the discharge coefficient of each formula is different depending on research groups. Hence in this study, we employ physical experiments to validate the numerical model of stormwater interaction, not only between the ground surface and the sewer system, but also the drain channel in order to estimate the application of suggested coefficients (Lee et al., 2012). This experimental setup consists of a rainfall supplier, a surface flood plain with buildings, a sewer pipe, and connection pipes (drain channels) between the ground and sewer pipes. From the comparison between experimental results, simulation piezometric heads, and discharge of the sewer pipe, the above mentioned discharge coefficients and application of the model are validated. Consequently, in the steady-state cases, the weir and orifice formulas with new coefficients could reproduce the experimental results very well. In the unsteady-state cases, increasing timing of surcharge and maximum inundation depth could reproduce the experimental results very well, but decreasing timing was overestimated.


Year: 2012

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