How to stop water running outside of PVC pipe?

[bigbird21]

HI, I installed agi pipe to fix a boggy backyard problem that worked but unfortunately I have noticed during a downpour that some water is running along the outside of the pvc pipe connected to the grease trap and coming in around the sides of the pipe within the greasetrap.

I feel the agi pipe trench the gravel underneath is allowing the water to hit the pvc pipe and following this smooth surface to the greasetrap.

We have a clay layer about 30cm below & seems to be clay the whole way down, I think this is the problem

 

[bigbird21]

Ok thankyou.

What are your thoughts about the problem of the water once it's sealed at greasetrap since it will have been blocked from releasing there

[JacobZ]

Hi @bigbird21,

If I am following correctly, then sealing around the pipe should just make the water sitting in the grease trap flow down the PVC pipe to the septic instead of tracking down the outside of the pipe.

This seems ideal to me, so I don't see any real issues.

Let me know if I am missing something.

Jacob

[bigbird21]

No it's not the greasetrap water leaking out it's water leaking into it from the outside 

[JacobZ]

Ok @bigbird21, I understand now. I had thought it was the other way around.

If you seal around that pipe, then the water will just find the next path of least resistance, which will more than likely be straight down into the ground. I can't see any issues with that either.

Let me know what you think.

Jacob

[bigbird21]

Update after 400mm of rain during cyclone Alfred I'm quite happy with the results. There is alittle seepage but not enough to be concerned about at this point.

What I did as I could not easily pump the silkafex around the pvc from the outside I did as much as possible then allowed to set. Then I mixed some cement & packed around the gap of pvc into the greasetrap cement surround. Before I did this I also used silkafex on the inside & worked it into the gaps.

At this stage I would say it has worked.

Thankyou for the help

[MitchellMc]

Fantastic stuff @bigbird21! Well done, and many thanks for sharing the update.

Mitchell