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    "H is upstream head above the crest, not energy head; optional L_c envelope H/L_c∈[0.08,0.50]; optional P with H/P≤1.5",
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    "H is upstream head above the crest, not energy head; optional L_c envelope H/L_c∈[0.08,0.50]; optional P with H/P≤1.5",
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      "section": "Volume flow rate",
      "url": "https://www.iso.org/standard/31895.html",
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      "section": "Broad-crested weirs",
      "supports": "Critical-flow rectangular broad-crested discharge; C_d of order 0.85",
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