It turns out the city has costly and in-depth requirements for curb cuts. That's not gonna happen.
I think I'm going back to 2" pipe for the full distance. It will be much easier to get that under the sidewalk. I can step up to 3" after the walk and terminate in a 6" diameter catch basin. The basin will be topped by a 6" pop-up discharge. That can be changed out for a grate if necessary.
The basin will be perforated and set in a deep bed of rock. It can be surrounded by pave stones to prevent a muddy mess.
The parkway beside the curb is in the utility right of way so I have to be willing to lose anything placed out there.
Locate it in the driveway cut, steeper grade/self cleaning. I believe it should be located above grade. The rock in the "gabion" would diffuse the flow, much like an aerator in a fish tank.
Having something that can charge a reservoir (6" pipe 50' long would allow the pump to cycle off earlier and being above grade it's not pushing against (surface) water.
The cap at the end of the perf pipe should be accessable to clean out.
