The resistance to flow in canals and rivers is strongly influenced by the roughness of the bottom, the presence of obstacles and vegetation. This phenomenon is closely linked to the risk of flooding, since it increases energy dissipation and raises water levels. In this context, an experimental study was carried out with the aim to process and analyze the effect of vegetation on the transport of suspended particulate matter from sediments injected upstream by monitoring changes in turbidity as a function of time and quantifying the balance of transported sediments. The experimental set-up consists of an open-air rectangular glass channel 10m long, 0.8m high and 0.6m wide. As the slope of the channel is adjustable, two slopes were chosen: 1% and 5%. A (stable) water circulation loop was provided by an electric pump delivering a variable flow rate. The bed was covered with dense artificial vegetation in the longitudinal direction of the flow. Two experimental series were carried out, the first with a fixed quantity of sediment injected and a variable flow rate, the second with a variable quantity and a fixed flow rate. The two series were reproduced at slopes of 1% and 5%. The results show a decreasing variation in turbidity as a function of time from upstream to downstream in the presence of vegetation. The increase in flow and slope favors the removal of sediments from the vegetation and thus increases turbidity, which reduces the quantities retained by the vegetation, thus favoring sediment erosion and deposition.