Abstract
To clarify the pollutant loads in Lake Teganuma, which is one of well-known eutrophied lakes in Japan, we performed field measurements on external inflow and internal production loadings from June to October in 2003. The external loadings of T-N, T-P and COD through main inflow rivers and the North-Chiba water conveyance channel were discussed quantitatively. The percentage of the internal production loading for COD in total loadings was from 45 to 65% under normal atmospheric conditions. The measured results suggested an adequate correlation between the internal production loading for COD and the solar radiation although the discharges from the channel and the inflow rivers were not correlative to the internal production loading for COD.
