Look into a one way valve / back flow prevention unit to prevent possible back flow from the street.
I can't get under the sidewalk and out the curb without leaving a low spot in the pipe. The opening would be prone to plugging from debris, some of which could be pushed up against the back flow valve and hold it closed.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
