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    "Rectangular hydraulic jump: y2/y1 = (√(1+8 Fr₁²) − 1)/2; Fr₁ > 1",
    "ΔE = (y2 − y1)³ / (4 y1 y2); Fr₂ = Fr₁ / (y2/y1)^{3/2}",
    "Not a Froude wrap, not Manning, not Chezy, not a weir, not Q=Av"
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      "section": "Froude number Fr",
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