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A synthetic-fiber barrier for the removal of turbidity in the treatment of stormwater runoff was developed and tested using a laboratory scale test channel.The removal mechanisms were predominantly interception,diffusion and sedimentation.The effects of hydraulics (flow rate and exchange rate),density current due to temperature and turbidity difference,the barrier conditions (thickness,number and shape) and particle size were analyzed.The experimental results indicated that the removal efficiency was positively related to the barrier thickness and number,and inversely related to the strength of the density current,and was also negatively affected by the flow rate and exchange rate.A wedged barrier was found to work better than a rectangular one when the same amount of fiber was used.Coarser particles contributed to higher removal efficiency,and the particles uniformity coefficient inversely affected the removal efficiency.Based on the experimental work,empirical models for the removal efficiency and barrier design were established using dimensionless groups.The modeling results indicated that the predicted values were consistent with the experimental work and the increases and decreases in the performance were suitably simulated.