Is there any legal requirement for a minimum depth of a drain?
I need to lower my manhole cover by 2 courses of bricks. This will make it quite shallow. About 18 inches top to bottom.
If it's not deep enough you're in the sh@t, ho ho ho!!!!!
Seriously though, check to see if you can see a "tide mark" from past blockages, give you an indication how high the water etc. will rise
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