Determing GPM through PVC pipe (Gravity Drains)

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To determine the flow rate in GPM of water through a vertical PVC pipe using gravity, the kinetic energy at the bottom can be equated to the loss of potential energy from top to bottom. This approach, however, does not account for friction losses within the pipe. For a more accurate calculation, incorporating friction factors is essential. Resources like the Bernoulli equation and Moody friction charts can provide further insights into these calculations. Understanding these principles is crucial for precise flow rate assessments.
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Does anyone know the equation to find the flow rate, in GPM, of water through a vertical pvc pipe? No pump, just gravity.
 
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depends on the accuracy required for your answer. first approximation: the kinetic energy (velocity) at the bottom equals the loss of potential energy from top to bottom. that neglects friction losses. Try googling 'bernoulli equation' and 'moody friction' for more details.
 

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