Water Measurement with Flumes and Weirs

Clemmens, A.J., T.L. Wahl, M.G. Bos, and J.A. Replogle. 2001. Water Measurement with Flumes and Weirs. International Institute for Land Reclamation and Improvement, Wageningen, The Netherlands, ISBN 90-70754-55-X This manual describes how to design, construct, and operate long-throated flumes to measure and control water flow in open channels. Broad-crested weirs with a streamlined flow contraction are members of the long-throated flume family and can be analyzed with the techniques described herein. Broad-crested weirs are particularly well adapted to irrigation canals, while long-throated flumes are well adapted to natural streams. The range of conditions over which flow can be measured with long-throated flumes and broad-crested weirs is unlimited. A large variety of examples are presented. The manual includes a revised mathematical model for designing a flow-measuring structure in any open channel to satisfy user-specified hydraulic boundary conditions and design requirements. Upon completion of the design, the model will compute the head-versus-discharge relation and the hydraulic energy losses for the flume or weir. The computer program presented in this publication can accommodate a wide variety of structure and channel shapes as well as many different input and output units. This version greatly expands upon the capabilities of previously published programs.

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