The photo below shows an access chamber on my foul water drain. The pipe to the left of it is the surface water drain. Both foul and surface water drain pipes are almost at the same level.
I want to make a new connection to the foul drain coming in from the left side. What's the best way to connect into this?
I was thinking of putting a square branch junction downstream of the AC and looping up over the surface water pipe. In addition I could put a U-bend into the surface water pipe to create some room so that the square branch would not have to loop over and could stay lower, but this might present rodding problems later.
Further up the pipe, about 20 yards, the lines cross over. Think the surface water pipe runs over the foul. However don't think that would be good as there is a slight climb going back and I probably wouldn't have the height to run a connecting line 20 yards and still maintain a fall... and connecting against the direction of flow probably wouldn't be a good idea either.
The connection is intended for sink waste from a shed only at the moment. But no telling what someone may try to do with it in future.
Seems like your suggestion is the best option. What would it look like. Seems like it would leave quite a pool of waste in the length of the pipe unless it was connected in with a bend like you would use for a trap.
sorry i assumed you were going to use 100 ml pipe. Why would you put an oblique junction against the flow ??? You can get a reducing connector from 40 /50ml into your pipe. Worry about future works when they are needed. Can't really tell a lot from photo.
The end of the green line is where the gully trap will be. Are you suggesting to run from there back to the corner. There is a slight rise in the ground (about 6 inches) from there to the corner so I'm concerned I won't have the necessary fall.
No sorry didn't realise where your shed would be. You'll be able to go over the storm and t in to the foul if it's only a sink. There is a connector for that purpose you can get from any domestic drainage retailer. I'll try find my drainage catologue for the part number.
I was also looking at a t in from top with a 110mm right angle branch, rotated a bit. Then with an adjustable bend I could probably get it to fit so that the crossover keeps fairly close to the surface water pipe. Would leave me with about 80-90mm to fill with Type 1 and sand before laying blocks.
