■ Impoundment of reservoir brings changes on river environment such as hydraulic characteristics, Trial impoundment, water quality and ecosystems. So the analysis of major factors influent on water quality changes to newly impounded reservoir is needed.
■ Gunwi dam is Located in Wi stream the tributary of Nakdong river, Korea and trial Impoundment was conducted to test safety of dam facilities during 2009 to 2011.
■ Water quality changes were monitored in previously impounded reservoir
■ Impact assessment of trial impoundment & cause analysis of water quality changes
