Centennial Technology has completed the installation of observation stations for inflow rivers upstream of 15 dams ordered by the Korea Water Corporation. In this project, 7 stations are located in the upstream of Andong Dam, 7 stations upstream of Imha Dam, and 1 station upstream of Daegok Dam. The purpose of these stations is to constantly monitor the water quality of the streams flowing into the dam in order to manage the water quality inside of the dam. EXO2 YSI sonde, total phosphorus analyzer, automatic water sampler, rainfall gauze, water level meter, RTU, computer, etc. were installed at each station.