OK final update I hope on this topic. My plumber friend came round yesterday and we repaired this properly. In the end we had to cut the downpipe just above…

Not that I can see, there's enough fall away from the house that the water was draining away.
Drainpipe is exposed to UV (it's on the Northerly aspect of the house),…

Progress update. The L bend was indeed leaking (badly). It was quite squashed and the PVC pipe fed from it horizontally was also deformed.

I cut the pipe to the…

Ok helpful people - general area located! Lawn was super wet here so I started digging. It then started raining, and the hole filled up in about 2 minutes. There's…

I believe the ARI 20 is 251 (Sunshine Coast). The 12 x downpipes are 90mm, the riser is 110mm. I believe that the stormwater drains fed from the downpipes are…

It's a fairly large house - I am attaching a drone shot so you can see. Yes, there is a significant amount of underground pipe to get to the tanks.…

Thanks so much for your feedback!!! I also notice some potential bandicoot holes in this area - I wonder if they have damaged the PVC?
I will excavate around the riser…

saveh2O you seem to be the guru, any thoughts?
Thanks
Jeremy

We have approximately a 250m2 roof feeding into leaf diverters and then downpipes into a wet system. Our house is on the Sunshine Coast and there hasn't been a lot…