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A new patent registered device-suspended flexible curtain (SFC) for sedimentation enhancement is proposed in this paper, which consists of two parts: a hght-weight curtain with sediment-passing windows and a heavy pillar for the device stability. The mechanism of trapping nearbed sediment by the SFC is such that a primary and a secondary circulations with horizontal hubs would be formed at the leeside when it is placed on beds in running flow; the velocities within the sediment-passing windows are locally accelerated, the nearbed sediments would be brought by the flow through the win-dows, and then settled down within the primary circulation zone. Experimental tests on hydraulic characteristics are con-ducted in a laboratory flume with rigid bed. It is found that the dimensions of the curtain and the sediment-passing win-dows determine the characteristics of the primary and the secondary circulations. The intensity of the primary and the sec-ondary circulations is dominated by the size of the sediment-passing window. Whether the secondary circulation would contact the bed or not depends on the level of the sediment-passing window. The length and the height of the primary cir-culation zone demonstrate quasi linear relationships with the effective height of the SFC. And the tests on sandy bed flume show that the sediment deposition happens just in the primary circulation zone.