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==Spacing drainage pipes==
 
==Spacing drainage pipes==
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[[File:Drain spacing.jpg|thumb|The yellow box represents the recommended hydraulic conductivity of bioretention filter media]]
 
In most LID underdrain applications, drains should be spaced between 5 - 6 m apart.
 
In most LID underdrain applications, drains should be spaced between 5 - 6 m apart.
 
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''q'' is the inflow volume expressed as a depth over the entire surface (m)
 
''q'' is the inflow volume expressed as a depth over the entire surface (m)
 
===Example===
 
===Example===
[[File:Drain spacing.jpg|thumb|The yellow box represents the recommended hydraulic conductivity of bioretention filter media]]
   
During a 25 mm storm event, a bioretention cell receives concentrated flow from a catchment 20 times larger than its own footprint (25 x 20 = 500 mm = 0.5 m).  
 
During a 25 mm storm event, a bioretention cell receives concentrated flow from a catchment 20 times larger than its own footprint (25 x 20 = 500 mm = 0.5 m).  
 
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.  
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