**Pipe Flow Calculator | Hazen–Williams Equation**
https://www.omnicalculator.com/physics/pipe-flow

Jan 12, 2022 · The hydraulic radius, R, is the proportion between the area and the perimeter of your pipe. If the pipe is circular, you will find it according to the following equation: R = A / P = πr² / 2πr = r / 2 = d / 4. where r is the pipe radius, and d is the pipe diameter. In this pipe flow calculator's Advanced mode, you can view and modify all these parameters (area, perimeter, …

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