I keep getting onion and tomato peels coming out of my basement storm drain after doing any sizable cooking and putting it through the garbage disposal. The kitchen is on the 1st floor, the drain is in front of the basement apartment door. The 1.5" drain pipe from the kitchen travels some 5' horizontally, then drops down into the basement (where it says "vertical stack"). I know the diagram because I did the pipe work a few years ago. The outdoor storm drain is 3", from the point where it meets the vertical stack coming from upstairs, it becomes 4".
It can be snaked out, I have done it several times. But is there any way I can prevent this from happening in the future without digging out and rearranging my drain pipes? Could it be cause by poor drainage downstream, which causes buildup in the pipe so the solid waste doesn't drain as fast and it floats up and through the outside drain?