Is 2†sufficient for this sump pump discharge line?
I have a narrow piece of property with a slight negative grade from the street - <1% in the front then 2-3% about mid-way to the back.
I’m subbing out the construction of a 30†x 30†x 40†concrete sump pit (and electrical), but I will be doing all the Schedule 40 PVC piping to the pit from the downspouts and catch basins, buying materials this week.
Sump pump will be a Zoeller M267. I originally planned on a 2.5†discharge line but the contractor that’s doing the sump pit notes and requests a 2�
The pit will be receiving water from 5 down spouts and various trench drains that will act as insurance during a heavy fast rain. I did calculations based on a 4†in one hour rainfall, and at maximum approx 34GPM would be dumping into the pit.
Those numbers check out based on water area catchment maths but I wanted to see what you all thought in the real world.
Other info:
Rise from pit to curb drain is approx 1.5’ to 2.5’. Pump will be approx 125-135’ from curb drain.
Pit and discharge line are green in the pic.
Thanks for any help ðŸ‘ðŸ½