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There are two factors which determine the flow rate of water. Diameter and velocity. Resistance is not needed for determining the size of waterlines to their respective flow rates. Resistance is a component of velocity calculated for determining several aspects such as pump hp, and loss of velocity over a distance. The formula without the resistance component is: Q=Av where: Q=Flow Rate A=Inside pipe area v=velocity Calculate: Q= (3.14XR squared)v lets assume a velocity of 10 inches per minute For 1/2 inch pipe: Q = (3.14 X 1/4" X 1/4")X10 inches per minute Q = 1.96 Cubic inches per minute For 3/4 inch pipe: Q= (3.14 X 3/8" 3/8") X10 inches per minute Q = 4.41 Cubic inches per minute So one 3/4 inch pipe will carry roughly 12% more water than two 1/2 inch pieces.

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Q: Will three quarter inch waterline carry as much water as 2 half inch waterlines?
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