Abstract
A receiving tank and an elevated tank are providing a problem to cause deteriorated water quality. This paper evaluates the structure of the water tanks by using the Morril index and the short-circuit index. The kinds of apparatus used a square water tank and an oblong style water tank. In addition, two water tank apparatus are installed with partition and provided with detour flow. There are holes of diameter 26mm (one or more) and 6mm (two or more) on the partition This makes the water tanks possible to promote the flow to be more pushed out.
