How to plumb two downpipe outlets into one?

[mechanical2]

Putting 2x 90mm downpipe outlets into 1 . Should try do y junction adaption into 100mm ? Then drop down into stormwater open grate to soakwell . Also should I have 100mm pipe into soakwell from grate. It got fitted with a 90mm pipe. The two roof areas 12m2 each side. Total 24m2 area. 

 

 

  

[EricL]

Hello @mechanical2 

Thanks for sharing your question about your downpipes. Please note that any plumbing work or stormwater connections must be carried out by a licensed plumber for safety and compliance.

It's probable that the plumber will be using a "Y" junction with a reducer to accommodate the change in size. In regards to the soak well you can always ask your plumber regarding the pipe size. But from a drainage point of view, a larger pipe will be able to carry more water in it.  

If you need further assistance, please let u know.

Eric