Special Issue for the 13th IWA International Specialist Conference

Effects of land use change and water reuse options on urban water cycle

Jiho Lee , Gijung Pak , Chulsang Yoo , Sangdan Kim , Jaeyoung Yoon


Received September 25, 2009,Revised January 25, 2010, Accepted , Available online

Volume 22,2010,Pages 923-928

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The aim of this article was to study the effects of land use change and water reuse options on an urban water cycle. A water cycle analysis was performed on the Goonja drainage basin, located in metropolitan Seoul, using the Aquacycle model. The chronological e ects of urbanization were first assessed for the land uses of the Goonja drainage basin from 1975 to 2005, where the ratio of impervious areas ranged from 43% to 84%. Progressive urbanization was identified as leading to a decrease in evapotranspiration (29%), an increase in surface runo (41%) and a decrease in groundwater recharge (74%), indicating a serious distortion of the water cycle. From a subsequent analysis of the water reuse options, such as rainwater use and wastewater reuse, it is concluded that wastewater reuse seemed to have an advantage over rainwater use for providing a consistent water supply throughout the year for a country like Korea, where the rainy season is concentrated during the summer monsoon.

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