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Abstract:The objective of this study was to develop guidelines for use of the Iowa Vanes
technique for sediment control in bridge waterways. Iowa Vanes are small flow-training
structures (foils) designed to modify the near-bed flow pattern and redistribute flow and
sediment transport within the channel cross section. The structures are installed at an angle
of attack of 15 - 25' with the flow, and their initial height is 0.2 - 0.5 times water depth at
design stage. The vanes function by generating secondary circulation in the flow. The circulation
alters magnitude and direction of the bed shear stress and causes a reduction in
velocity and sediment transport in the vane controlled area. As a result, the river bed
aggrades in the vane controlled area and degrades outside.
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