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Discuss Drainage advice please BOS/diversion in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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Hi we had an agreement with Welsh water to divert some surface water pipes-also a BOS but not relevant.

There is a small amount of water left in the drain invert for a few hours after rain.

Is there a tolerance for water in bottom of pipe?

I have already dug it all out once and re-levelled it, there is probably a ton of hardcore on top of the pipe and I really don’t want to dig it all out again if not necessary.

Any advice greatly appreciated
 

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