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| 0.4 typical
 
| 0.4 typical
 
|-
 
|-
| Perforated pipe
+
| Perforated pipe and bedding
 
| Is equal to underdrain pipe diameter
 
| Is equal to underdrain pipe diameter
 
| Not applicable
 
| Not applicable
| 1.0
+
| 0.4
 
|-
 
|-
 
| Storage reservoir (''d<sub>s</sub>'')
 
| Storage reservoir (''d<sub>s</sub>'')

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