In this study, we examined in each land use by status, the impact on water quality due to soil elution from the submerged land in flooded soil water storage at the time due to dam construction.
At the elution experiments, acrylic column was made to reproduce the water situation of early dam impoundment.
Analysis item for measuring the change in water quality, water temperature, DO, pH, Conductivity is measured for basic water quality and COD, T-N, T-P was analyzed as the index item of water pollution. Soil was sampled by land use situation before it is submerged. And it is examined the effects of soil flooding on water quality in two different dissolved oxygen condition of overlying water, aerobic and anaerobic.
Analysis has been focused on implementing the level of contribution of pollution sources and elution volume analysis of to the water body.
Elution amount is increased by increasing the submerged area as water level becomes higher, but the influence to the water quality is decreased with a dilution effect due to the increase of the storage capacity.