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    "USBR high-overflow ogee: Q_cfs = C L_ft H_ft^{3/2}; C = 3.98 (H/Hd)^{0.12}; SI L, H, Hd, Q; C is reported, not an input",
    "H/Hd∈[0.2, 1.33]; optional P with P/Hd≥1.7; vertical upstream face; free overflow",
    "Not thin-plate (2/3) C_d L √(2g) H^{3/2}, not broad-crested (2/3)^{3/2} b √g H^{3/2}, not sluice, not Manning n, not Q=Av, not Francis 3.33"
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    "H/Hd∈[0.2, 1.33]; optional P with P/Hd≥1.7; vertical upstream face; free overflow",
    "Not thin-plate (2/3) C_d L √(2g) H^{3/2}, not broad-crested (2/3)^{3/2} b √g H^{3/2}, not sluice, not Manning n, not Q=Av, not Francis 3.33"
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    "Cd, broad-crested b, sluice a/y1, Manning n/R/S, Q=Av v, g, orifice A/d → MIXED_INPUT_ENCODING",
    "H/Hd outside [0.2, 1.33] or P/Hd < 1.7 → VALUE_OUT_OF_RANGE",
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      "section": "High overflow ogee, vertical upstream face",
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      "kind": "reference"
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    {
      "title": "ISO 80000-4 — Mechanics",
      "section": "Volume flow rate",
      "url": "https://www.iso.org/standard/31895.html",
      "supports": "Q is volume flow; L, H, and Hd are lengths",
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