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|-
 
|-
 
| Pipe diameter reservoir
 
| Pipe diameter reservoir
| Is equal to underdrain pipe diameter
+
| Is equal to underdrain [[pipe]] diameter
 
| 0.4  
 
| 0.4  
 
|-
 
|-
| Pipe bedding (''d<sub>b</sub>'')
+
| [[Choker course|Pipe bedding]] (''d<sub>b</sub>'')
 
| 50 mm (although commonly omitted altogether).  
 
| 50 mm (although commonly omitted altogether).  
 
| 0.4
 
| 0.4
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