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Bathtub Drain Time Calculator
Estimates bathtub drainage time based on tub volume, drain size, and flow rate.
Tub Volume
?
Standard tubs are 40-80 gallons.
gallons
Drain Diameter
?
Typical bathtub drain size.
Estimated Flow Rate
?
Typical gravity drain flow 15-30 GPM.
GPM
Calculate
Results
Drain Time
-
minutes
References:
ASPE Plumbing Engineering Design Handbook