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Wahl/Clemmens/Replogle. 2003. "The Energy Correction for Calibration of Submerged Radial Gates". Bureau of Reclamation, Report Number PAP-902.

Abstract: The E-M (energy-momentum) method is a new technique for calibrating radial gates, using the energy equation on the upstream side of the vena contracta and the momentum equation downstream from the vena contracta when the gate is submerged. This method allows continuous calibration from free to submerged flow through the transition zone, and overcomes several limitations of energy-based submerged flow equations since it explicitly accounts for downstream channel conditions. A key parameter in the method is an energy correction factor for submerged flow. This paper uses a previously collected data set to demonstrate the dependence of the energy correction on the relative gate opening and to develop an improved model for predicting the energy correction.

Web Link: http://www.usbr.gov/pmts/hydraulics_lab/pubs/PAP/PAP-0902.pdf

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