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| [[choker layer|Choker course]]
 
| [[choker layer|Choker course]]
 
| colspan="2" |100 mm
 
| colspan="2" |100 mm
| 0.4 typical
+
| 0.4
 
|-
 
|-
 
| Perforated pipe and surrounding aggregate
 
| Perforated pipe and surrounding aggregate

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