Changes of River's Water Quality Responded to Rainfall Events

Abstract

The study focused on changes of river’s water quality dependent on rainfall events. Hwang River, at South Korea was chosen for the study. Water samples at up and downstream of Hwang River were collected for three different rainfall events on Sep. 10th 2011, Jul. 14th 2012, and Aug. 13th 2012. Samples were analyzed for COD, TSS, T-N and T-P. As results, the changes of water quality due to rainfall events were dependent on the amount of precipitations as well as patterns of rainfall event. Also, changes of water quality at upstream were affected by the amount of discharges from Hapcheon Dam located in upper side of the river. For proper management of Hwang River’s water quality, plans for early rainfall events after long-term dry season should be established.