American Society of Civil Engineers

Sediment Control at Lateral Diversions: Limits and Enhancements to Vane Use

by Brian D. Barkdoll, M.ASCE, (Asst. Prof., Dept. of Civ. Engrg., Univ. of Mississippi, University, MS 38677), Robert Ettema, M.ASCE, (Prof., Dept. of Civ. and Envir. Engrg., Univ. of Iowa, Iowa City, IA 52242), and A. Jacob Odgaard, F.ASCE, (Prof., Dept. of Civ. and Envir. Engrg., Univ. of Iowa, Iowa City, IA)

Journal of Hydraulic Engineering, Vol. 125, No. 8, August 1999, pp. 862-870, (doi:

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Document type: Journal Paper
Abstract: This paper presents the findings of laboratory flume experiments conducted to determine the limits to which submerged vanes can be used in preventing excessive bed-sediment ingestion into lateral diversions of flow from alluvial channels. The experiments show that a scheme of submerged vanes placed at the diversion entrance admits only a negligible rate of bed-sediment entry into the diversion when the ratio of unit discharge in the diversion to unit discharge in the main channel, q\dr, is less than about 0.2. Beyond this value, the effectiveness of the vanes diminishes. The sediment-control performance of the vanes can be enhanced in several ways. One enhancement is the use of a skimming wall in conjunction with the vanes. The wall and the vanes are effective for values of q\dr up to about 0.3. Another enhancement is to widen the diversion entrance such that, at the entrance, q\dr does not exceed about 0.3. Further potential enhancements (modified vane shape, uniformity of flow distribution into the diversion, and increased flow velocity into the diversion) were found not to be effective. The findings are supported by observations of flow and bed-sediment behavior at a flume-scale diversion.

ASCE Subject Headings:
Diversion structures
Water intakes