Changes

===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. 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 }= m^{2}/m</math>

<math>\frac{0.008\ m \times 0.0012\ m\times6}{0.03\ m }= 0.0024\ m^{2}/m</math>