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The bioretention cell comprises 0.6 m filter media (K = 2.4 m/day), laid over 0.6 m clear, coarse reservoir gravel. The pipes are laid within the reservoir, 0.9 m below the surface.  
 
The bioretention cell comprises 0.6 m filter media (K = 2.4 m/day), laid over 0.6 m clear, coarse reservoir gravel. The pipes are laid within the reservoir, 0.9 m below the surface.  
 
The system is designed to fill entirely during the rainstorm event. i.e. Depth to water table = 0 m.:     
 
The system is designed to fill entirely during the rainstorm event. i.e. Depth to water table = 0 m.:     
<math>Drain\ spacing=\sqrt{\frac{4\times 2.4m/day\left(0.9m-0m\right)^{2}}{0.5}}=6 m</math>
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<math>Drain\ spacing=\sqrt{\frac{4\times 2.4m/day\left(0.9m-0m\right)^{2}}{0.5m/day}}=6 m</math>
    
==Recommendations for material specifications==
 
==Recommendations for material specifications==
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