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http://dx.doi.org/10.3741/JKWRA.2006.39.2.139

Assessment of Flood Flow Conveyance for Urban Stream Using XP-SWMM  

Hong, Jun-Bum (Water Resources Research Dept.,)
Kim, Byung-Sik (Water Resources Research Dept.,)
Seoh, Byung-Ha (Dept. of Civil Engrg., Inha Univ.,)
Kim, Hung-Soo (Dept. of Civil Engrg., Inha Univ.,)
Publication Information
Journal of Korea Water Resources Association / v.39, no.2, 2006 , pp. 139-150 More about this Journal
Abstract
In recent, increasing of the impervious area gives rise to short concentration time and high peak discharge comparing with natural watershed and it is a cause of urban flood damage. Therefore, we have performed for structural and non-structural plans to reduce the damage from inundation. The Gulpo-cheon basin had been frequently inundated and damaged due to the water level of Han river. So, the Gulpo-cheon floodway was constructed with 20 meters width for flood control in the basin but it was not enough for our expectation and now we have a plan to expand the floodway to 80 meters. We use a XP-SWMM model developed based on EPA-SWMM version for analyzing the capacity of flood conveyance by the expansion of Gulpo-cheon floodway with the same 100 years return period design storm and the same tidal conditions of the Yellow sea. The flood conveyance after the expansion of floodway becomes three times comparing it with before the expansion. Also we simulate the flood discharge at the diversion point of Gulpo-cheon for the expanded condition of floodway and know that the discharge of about 300 m3/sec is flowing backward to the expanded floodway. Therefore we may need some kinds of hydraulic structures to prevent the back water.
Keywords
Gulpo-cheon floodway; flood flow conveyance; urban rainfall-runoff model; XP-SWMM;
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