We analyze and evaluate a correlation between fecal bacteria (Escherichia coli, fecal indicator bacteria and enterococci) and land use data for each month in the Oita River Basin. In these calculations, we consider the optimal range based on land use data from the observation points of the fecal bacteria. As a result of the analysis, we found that the correlation of agricultural land expect rice field is high in land use, and the correlations of the fecal bacteria are high in the case of using land use data from 400 to 500 m radius.
