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It is expected that the effluent turbidity will increase with a higher capture velocity.  This is because a larger range of particle velocities that will make their way into the effluent (when the capture velocity is .058 mm/s only particles with a velocity less than this will get into the effluent, however when the capture velocity is .231 mm/s particles moving faster than .058 will now make their way into the effluent). This is evident in both graphs, as the general pattern of the data for all four capture velocities demonstrates this trend. In the high floc blanket state, for 0.231 mm/sec, the highest capture velocity that was tested, the effluent turbidity is significantly higher than the other three capture velocities.  This could be because floc particles rolled up the tube and into the effluent.  A re-run of this experiment would confirm that floc roll-up is occuring at this capture velocity