Is there a way to add a 2nd river that meets up with the main one when using in a city?

Currently there is no way to do it, hopefully in the future:

https://www.reddit.com/r/FantasyCities/comments/l3ys5z/there_seems_to_be_somethi...

It's not implemented yet because I still hope to remake the whole "rivers" part of the code first...