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field poured concrete long-throated flumeA long-throated flume is class of flume in which the throat is considered to be long enough to cause the flow to form nearly parallel flow lines.  

Parallel flow allows long-throated flumes to be rated by fluid flow analysis - without the need to develop the level-to-flow relationship in a laboratory.  Long-throated flumes can have nearly any desired cross-section and can be developed to fit into most canals.  

Long-throated flumes are site specific, without standardized dimensions / flow equations.  As a result, they can present problems for the casual user and are not commonly used outside of irrigation / water rights applications.


Image:  Water Measurement Manual