Changes

===Example calculation===

===Example calculation===

A [[stormwater planter]] with footprint of 8 x 1.5 m is planned to received runoff from an adjacent rooftop. The initial design for the planters includes 750 mm depth of filter medium, 50 mm rock mulch, and a further ponding of 300 mm. The underdrain pipe will be embedded into high performance bedding or similar, with a strip of geotextile over the top to prevent migration of the filter media into the pipe. The lab test states that the medium has a hydraulic conductivity of 25 mm/hr.  

A [[stormwater planter]] with footprint of 8 x 1.5 m is planned to received runoff from an adjacent rooftop. The initial design for the planters includes 750 mm depth of filter medium, 50 mm rock mulch, and a further ponding of 300 mm. The underdrain pipe will be embedded into high performance bedding or similar, with a strip of geotextile over the top to prevent migration of the filter media into the pipe. The lab test states that the medium has a hydraulic conductivity of 25 mm/hr. The maximum flow through the medium will be calculated and a comparison made with the maximum flow through the pipe to see....  

<math>Q_{max}=25 mm/hr\times 12 m^{2}\times \left (\frac{\1.1 m}{0.75 m}  \right )\times 3.6 \times 10^{-3}</math>

<math>Q_{max}=25 mm/hr\times 12\ m^{2}\times \left (\frac{1.1\ m}{0.75\ m}  \right )\times 3.6 \times 10^{-3}</math>