We have several hillsides where it looks to me like dumping the laterals into sub-mains would work better if those laterals were about 45degrees to the sub-main, instead of the 90 that appears to be standard.

Appears that the water from the lateral would increase the flow in the sub-main, instead of hitting the side and then moving into the flow down the sub-main.

Why or why not?

Thanks.

Pattern would be something like this...….

submain       lateral

!                          !

!     45deg    !             waterflow  is downhill.  V

!           !                                                          V

!  !                                                                   V