Runoff characteristics of pesticides for the R. Katsura, the R. Uji and the R. Kidu

We observed every three days to estimate runoff of pesticides in 2007 and 2008 for the R. Katsura, R. Uji and R. Kidu which merges and then become the R. Yodo, which is the main source of water supply in Kinki area. The runoff behaviors of pesticides and those runoff loadings were made clear, and the runoff rate of pesticides and the detected indicator value of the total runoff estimation method were estimated. The runoff of Bromobutide, Simetryn and Pyroquilon were observed in long period. The detected indicator value was lower than the standard one. The runoff rates of Bromobutide and Simetryn were lower than 10 %, and that of Dimethametryn was higher than those.