Calculate cockpit drain sizing for rapid water evacuation per ABYC H-12
Input Parameters
Results
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Cockpit Volume
gallons
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Min Drain Diameter
in
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Drain Time
minutes
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Flow Rate per Drain
gpm
Reference
ABYC H-12: Cockpit must drain before next wave (5 min)
Drain flow: Q = Cd × A × √(2gh)
Minimum 2 drains, 1.5" ID each
Cd = 0.61 for sharp-edged orifice