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* 0.35 for more loamy Blend B - Water quality treatment priority
* 0.35 for more loamy Blend B - Water quality treatment priority
|-
|-
| Pipe diameter reservoir
| Choker layer
| Is equal to underdrain [[pipe]] diameter
| 100 mm
| 0.4
|-
| Perforated pipe diameter
| 150 to 200 mm
| 0.4
| 0.4
|-
|-
| [[Choker course|Pipe bedding]] (''d<sub>b</sub>'')
| Clear stone aggregate layer below perforated pipe
| 50 mm (although commonly omitted altogether).
| 50 mm (although commonly omitted altogether).
| 0.4
| 0.4
|}
|}