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Long-Throated Flumes <br />and Broad-Crested Weirs <br />•Long-throated flumes have one-dimensional flow in the <br />control section -- Long-throated means long enough to <br />eliminate lateral and vertical contraction of the flow at the <br />control section…streamlines are essentially parallel <br />–Can be calibrated using well-established hydraulic theory <br />•No laboratory testing needed <br />–Calculations are iterative and tedious, so computer models that do <br />the calculations have made long-throated flumes practical in recent <br />years