On Oct 12, 9:28 am, MNRebecca wrote:
On Oct 11, 9:29 am, Bobk207 wrote:

.how much elevation change does
the drain line have over the 40 feet? It needs about 10"......5"
could work but without sufficient, drop the water won't move very
well.

Um... none. The downspout goes all the way down the wall of the house
and gets anchored to the house about 9 inches above the ground.
There's just enough room to attach a 90 degree elbow, which attaches
to the LONG horizontal 'pipe' (actually several sections of extra
downspout linked together AND making 1 additional 90 degree turn). I
sure see your point.

I think we know all the information we need to diagnos & make
suggestions.

Like I said before you need 10" (more or less ideal) or 5" absolute
minimum to make your gravity feed drain line work. The water that
backs up into the vertical section of the down spount is creating the
prssure to make the system work....but it also causes that errant jet
spray.

So...........

1) seal the joint with aluminum tape (eliminate the jet spray) &
forget about it
or
2) cut the down spout about 10" shorter and give the drain line
section some slope.

either method will work

cheers
Bob