Drain Slope Calculator (1/4 per Foot)

Can a drain have too much slope?

Yes. If a drain falls too steeply (well over 1/2 inch per foot), liquid can outrun the solids and leave them behind, causing clogs — the classic self-scouring concern. For long runs the goal is steady, uniform slope near 1/4 inch per foot rather than a steep drop followed by a flat section.

Related questions

• What is the minimum slope for a drain pipe?
• What slope do I need for a 4-inch sewer line?