The applicability of the proposed equation on the fltation and settling velocity of a single Microcystis floc was examined using additional data which were taken at different seasons. It was found that the degree of scatter in the velocities were a few times larger than that obtained for non-biological samples. The extent of scatter in the velocities for small sized colonies were larger than that obseved for large colonies. These findings imply that there exists a transition from uniform structure to self-similar structure of the colony. From the analysis of settling velocities of pressurized colony, it was clarified that the morphology of Microcystis flocs can withstand for theapplied pressure up to 1.0 MPa.
