Foul water drain through length of footing

[Andy Mac]

So I have an issue. I've come accross foul drainage going through the middle of the 5 meter length of footing. However this drainage runs through the whole length at around 70cm depth. I was hoping to dig 1 meter. What's the correct way to get around this issue. The drain seems to have a load of haunching around it which takes up over half of my footing.

 

[^woody^]

Move the footing

Move the drain

Get the water authority's permission if needed, as that looks like a shared drain

 

[noseall]

We came across this once where the drain travelled diagonally all the way along our proposed trench.
We bit the bullet and ripped the lot out, put a single chamber at one end (outside of the building) and straightened the drain so that it ran under the building but in a straight line just missing the found's. We then put two chambers at the other end to divert it back on track.

Such fun.

 

[noseall]

Oh and it was all 6" stuff so cost 3 times the price of 4". And it was a main sewer serving more then one property but was back in the day (only just) before sewers were adopted.

 

[^woody^]

Diverting the drain is an option, but only normally if you are not building right up to the boundary, and have room for a manhole either side.

 

[noseall]

Diverting the drain is an option, but only normally if you are not building right up to the boundary, and have room for a manhole either side.

Yes, and falls are an issue too due to the slight elongation of the run. Changing from salt glaze to plastic helps as does precise drain laying i.e. no dips in the pipe etc.