Sanitary pipe under detention pond
Sanitary pipe under detention pond
(OP)
Reviewing plans from another engineer.
A detention pond (with a permanent pool of 2') is to be constructed over a 24'' sewer pipe.
There is less than 4' of cover over that pipe (bottom of the detention pond).
Water will freeze in winter (Canada). Do you think there should be some special considerations for this particular design?
A detention pond (with a permanent pool of 2') is to be constructed over a 24'' sewer pipe.
There is less than 4' of cover over that pipe (bottom of the detention pond).
Water will freeze in winter (Canada). Do you think there should be some special considerations for this particular design?





RE: Sanitary pipe under detention pond
While it's possible that the frost line will not be as deep under the pond or that flows in a 24" pipe will be sufficient to prevent freezing, it should be properly documented. The easiest way to address the issue is to insulate the pipe.
RE: Sanitary pipe under detention pond
This conduit will be 4' + 2' deep (2' water).
RE: Sanitary pipe under detention pond
I would be concerned about the sewer running under the pond. What happens if the sewer breaks and leaks into the surface water?
This would not be allowed under any jurisdictions I've worked in.
RE: Sanitary pipe under detention pond
RE: Sanitary pipe under detention pond
RE: Sanitary pipe under detention pond
RE: Sanitary pipe under detention pond
Regarding freezing, the conduit has to be isolated (wasn't shown on the plans).
I don't like this design at all (looks like I'm not alone). Made my point to my superiors and waiting for more validation from the engineer signing the plans.
RE: Sanitary pipe under detention pond
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RE: Sanitary pipe under detention pond
Nor the engineer in charge of the plans.
They say we'll be able to divert the sanitary and repair it if necessary. And we rarely have to repair a 24'' sanitary pipe.
Routing it would be extra $$$ and that basin couldn't be placed somewhere else (i.e "perfect" spot).
RE: Sanitary pipe under detention pond
RE: Sanitary pipe under detention pond
RE: Sanitary pipe under detention pond
RE: Sanitary pipe under detention pond