I have a surface drain system around my home, which gutters feed into. It is constructed of of 4" SDR 35 pvc sewer pipe, and I believe the installers were aiming for 1/8"/foot slope.
What's the flow capacity of this pipe at this grade?
I see several conflicting references on the internet. For instance, NDS says 135 GPM. Some other online calculators say closer to 70... that's a pretty big...
4" storm drain system capacity
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