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<p>Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity</p> <p><b>New page</b></p><div>== Summary ==<br /> The calculated onset parameter rises sharply as the layer becomes shallower at fixed extraction and density. Based on Cooper (2002), p. 3-228.<br /> <br /> Original illustration for [[Plugholing]], level 3 Advanced.<br /> <br /> * Source basis: Cooper (2002), p. 3-228; Milke (2002), p. 4-306 for illustrative 20 m³/s rate. Calculations in calculations/plugholing.py. Create an original visual; redraw, do not copy source figures.<br /> * Alt text: Curve showing a much larger Froude number for a 1.5 metre layer than for a 3 metre layer.<br /> * Accuracy notes: The threshold belongs to Cooper’s circular-vent formulation. Do not label this as a complete reservoir time-history prediction.<br /> <br /> == Licensing ==<br /> New drawing by Fire Safety Academy. © Fire Safety Academy.</div>

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