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Hi Engineers/Architects,

My plumber has connected waste water outlet (wash basing, bathtub, shower) and commode (shit pot) outlet to a common sewage pipe which is dropped down to sewage chambers built around the home. He has done that for three different bathrooms in the first floor. My architect says waste water outlet should not be linked to sewage pipe and they should be kept separate. If they are not separated then fowl smell will come through waste water outlets and into the toilets. And the chances of foul smell will be more in case of sewage blockages or if we leave the home locked for 3 or 4 days. On the other hand, my plumber says foul smell will not come because he has used trap to drain the waster water and hence joining waste water pipe to the sewage pipe will not be a problem. I don't know who is correct. Any ideas what is the right way to go ?

Thanks
Vimal

P.S: My plumber and architect don't belong to the same team.

i think it should be separate, and i have checked mine connection as he has connected separately else it would be big problem. Drainage cloging happens entire piping system will collapse in your house with no water go out with smelling in all the open drains. Drainage cloging is very common as main manhole of BWSSB will always get blocks.

Hi,
The waste water line should be separate for various reasons.
1.The toilets stick in case of floor trap water is dried out
2.your soak pit gets filled quickly
3.In case of drain block you will have the entire soil mixed coming out of chambers
4.Soil will reverse flow when blocks ,imagine soil settling in floor traps.

Regards
Ar.Praveen.N
Ardes architects and interior designers
ardesarchitects@gmail.com

Thank you all. I asked my plumber to redo and keep the waste water line separate.

Vimal.

Does this mean that there will be two seperate pipes only inside the bathroom and then joins to the same pipe once it goes out of the wall?
Or do we need to have sepearate lines all the way till the chamber?

Separate lines all the way to the chamber.

thanks Vimal, Sam, Praveen, very informative and timely info for me,

few quick questions,

1) I have seen in all house they put a exhaust type of vertical pipe to let the bad smell exit, isn't this sufficient?
2) When you say "separate lines all the way to the chamber", is it one (chamber) that we construct inside the compound or the BWSSB chamber?
2) is there a technique/hardware we can use to avoid waste water coming back/reverse, similarly for rats and rodents?

1) I have seen in all house they put a exhaust type of vertical pipe to let the bad smell exit, isn't this sufficient?
Exhaust is required for every sewage pipe.
2) When you say "separate lines all the way to the chamber", is it one (chamber) that we construct inside the compound or the BWSSB chamber?
There are 6 chambers constructed around my house. Chamber will act as a buffer before flushing to the common sewage line.

Vimal

my plumber did same thing ...for commode outlet he used 4inches pipe and for washbasin and bath outlet he used 2 1/2 inch pipe and he joined both the lines inside bathroom n connected to a common outtlet 4 inch pipe i(outside)which will be droped to the chamber

is it correct method ?

in our current house the 2 1/2 pipe is joined outside the bathroom to a common outlet

which is correct ?

mahesh - as per vimal thats not sufficient. there needs to be 2 separate ilnes till the chamber.