Abstract
The purpose of the study is to evaluate the water quality of rivers from the view point of the human sense by image test of river water. The result indicated 1) The image of “Clear water” has less relation with the value of BOD. 2) The image of “Clear water” has strong relationship with the image of “Transparent”. 3) The image of “Transparent” has strong relationship with “Transparency by cylinder test”, and is explained by “Transparency by cylinder test” and “depth”. 4)“Water color” reflects “Clear water”.
And it's showed that “Transparency by cylinder test” is presumed from the optical absorbance of SS at 610nm, which is percolated with filter papers from river water.
