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Aco drain required or not

Joined
1 Sep 2011
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Essex
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United Kingdom
I'm currently digging out for a new patio, I have accounted for a 1:80 fall away from the house, at the end of the patio I will need to build a retaining wall, probably 2-3 blocks high, with steps. Do you think I would need an ACO at the end of the patio, or could I just have a channel of loose stone against the wall, or nothing needed at all?
 
If you had an ACO, what would it drain into? Be meticulous to achive a 1:80 fall without any pooling.
 
If you had an ACO, what would it drain into? Be meticulous to achive a 1:80 fall without any pooling.
The 1:80 on porcelain should be fine, no? Can't see how that can go wrong if its set by a string line.

The aco would drain to a main sewer. But if its not necessary i would rather not do it
 
The slope in theory is fine, but it does take some precision laying to keep to exactly that. So in practice it a bit tougher.
 

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