... evaluated ,bottom mud samples were taken, and the degree of pollution of water and bottom mud was identified after dredging Elusion tests were carried out to identify the influences of polluted bottom mud ... In the current study, in Koya Pond, the authors identified the degree of contamination of water quality and bottom mud after dredging Considering that influences of bottom mud on water quality ... depending on the pond position, influences of precipitation and mud on water quality of the pond, quantification of effects by dredging, and assessment of improvement and controls of water quality...