Abstract
An experimental study of open channel flow resistance in horseshoeshaped conduits is reported. The friction factor is shown to increase approximately 20 percent in comparison to values taken from the Moody diagram for depths larger than half‐full. For depths less than half‐full, the friction factor agrees with that determined directly from the Moody diagram with four times the hydraulic radius taken as the length scale. The resultant changes in the ratio of part‐full velocity to full‐flow velocity are investigated and compared with field results for circular pipes. For small relative depths of flow, the experimental results for relative velocity agree with those obtained using the Moody‐diagram friction factor for a houseshoe conduit with no shape correction, but they approach field results for circular conduits at higher relative depths of flow for which a shape correction is needed.
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