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Impacts on water-cycle by land use change and effects of infiltration trenches in Asan New town  

Hyun, Kyoung-Hak (한국토지주택공사 토지주택연구원)
Lee, Jung-Min (한국토지주택공사 토지주택연구원)
Publication Information
Journal of Korean Society of Water and Wastewater / v.24, no.6, 2010 , pp. 691-701 More about this Journal
Abstract
As the water-cycle is transformed by increasing of the impermeable area in process of urbanization, decentralized rainwater management facilities(infiltration, harvesting and retention facilities) as source control are considered to be a method of restoring water-cycle of urban and reducing runoff. SWMM model was used to analyse the change of water-cycle structure before and after development in A new town watershed. Modified SWMM code was developed to apply infiltration facilities. The modified SWMM was used to analyse the change of water-cycle before and after infiltration trench setup in AJ subcatchment. Changes of the impervious area by development and consequent increase in runoff were analyzed. These analyses were performed by a day rainfall during ten years from 1998 to 2007. According to the results, surface runoff increased from 51.85% to 65.25 %, and total infiltration volume decreased from 34.15 % to 21.08 % in A newtown watershed. If more than 80 infiltration trenches are constructed in AJ subcatchment, the low flow and the drought flow increases by around 47%, 44%, separately. The results of this study, infiltration trench is interpreted to be an effective infiltration facility to restore water-cycle in new town.
Keywords
decentralized rainwater mangement; low impact development; SWMM model;
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Times Cited By KSCI : 3  (Citation Analysis)
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