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===Example calculation===
===Example calculation===
A part used roll of 100 mm diameter perforated pipe appears long enough to use for a stormwater planter project. Upon inspection the pipe is found to have perforations of 8 x 1.5 mm on six sides, repeated every 3 cm along the pipe. To calculate the maximum flow rate, first the open area per meter is calculated:
A part used roll of 100 mm diameter perforated pipe appears long enough to use for a stormwater planter project. The initial design for the planters includes 750 mm depth of filter medium, 50 mm rock mulch, and a further ponding of 300 mm. Upon inspection the pipe is found to have perforations of 8 x 1.5 mm on six sides, repeated every 3 cm along the pipe. To calculate the maximum flow rate, first the open area per meter is calculated:
<math>\frac{0.008\ m \times 0.0012\ m\times6}{0.03\ m }= 0.0024\ m^{2}/m</math>
<math>\frac{0.008\ m \times 0.0012\ m\times6}{0.03\ m }= 0.0024\ m^{2}/m</math>
Then:
<math>Q_{max, p}=0.5\times 0.61\times 0.0024\ m^{2}\m\sqrt{2\cdot 9.81\ m\s^{2}\cdot \sum 1.1 m}</math>