When it rains, soil erosion occurs and soil particles move into the reservoirs or stream. Nutrients and contaminants, which are adsorbed on soil particles, flow into waterbody and are leached into water. Then they effect on water quality and eutrophication of reservoirs. In this study, correlation of SS to COD was surveyed, and that of SS to T-P was also done. R2 values in wet period were almost over 0.8, but were very low in dry period. This shows that concentrations of COD and T-P will be assumed by using SS concentrations in wet period in stream.
