It can be seen from Fig. 5b that the lower value of the flow velocity, the more the TSS removal within increase of distance from the beginning of vegetation at a constant density of vegetation, 59 stems/m2. Finally, Fig. 5c shows that the TSS removal efficiency was affected by density of vegetation and length of the vegetation.From Fig. 5a it is observed that increases in vegetation density resulted in more TSS removal while flow velocity decreases and all this happened at constant distance of 2 m from beginning of vegetation zone