I think the 110mm is overkill. I'm just diverting the drain water through the garden.
if you can use 110, personally I would
more is never an issue, but less with the recent storms, could be bad
I wish I could use 110 to divert a 'dam' issue here by us, but had to make due with 3x 50mm next to each other
for the paving peoples:
now we are definitely happy that we finally got the paving done, however 2 things bothering me
1) some parts have settled a bit deeper than the rest so for someone that notices it, it's annoying
if they compacted a bit more and added more cement/sand, would that have helped with the settling?
2) when they were laying the paving, I noticed that they were using a sand/cement mix, but not a lot
now that some pieces have settled more (#1), the gaps between the bricks have become slightly bigger
wanted to know: could I close it with just cement, or should it be left in order for the 'shifting/settling'?