Line 40:
Line 40:
|-
|-
| [[Pipes|Perforated pipe]] and surrounding [[Aggregates|aggregate]]
| [[Pipes|Perforated pipe]] and surrounding [[Aggregates|aggregate]]
−
| 200 mm (i.e. pipe diameter)
+
| 200 mm diameter pipe
| Not applicable
| Not applicable
| 0.4
| 0.4