Surface water drain under driveway

[WWilts]

New build in progress.

 

Entire site is highly permeable, at all levels (subsurface, superficial deposits, bedrock). 

Rainwater discharge to planting (trees, new raingarden planting).

One 4 x 3m porch roof gutter discharge needs to cross a 3m driveway to discharge to plants. Occasional use driveway, with cars & perhaps the odd small lorry. 

 

Qu: What piping to use under the driveway?
Rigiduct is rated at 450N, whatever that means
Plain PVC drains in weak mix concrete is another possibility
There may be other cost-effective options

[Conor]

Twinwall. Tough as old boots. Will deflect rather than shatter, unlike PVC. Just allow a generous fall to allow for any deflections.