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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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