Calculateur de Pente de Drainage — Formule
## Drainage Slope
**Total Drop = Run Length x Slope**
The standard slope for most residential drain lines (3-inch and larger) is 1/4 inch per foot. Pipes smaller than 3 inches often require 1/4 in/ft as well, though codes may specify 1/8 in/ft for larger commercial mains.
**Total Drop = Run Length x Slope**
The standard slope for most residential drain lines (3-inch and larger) is 1/4 inch per foot. Pipes smaller than 3 inches often require 1/4 in/ft as well, though codes may specify 1/8 in/ft for larger commercial mains.
Exemple Résolu
A 20-foot drain run at the standard 1/4 in/ft slope.
- Drop = 20 x 0.25 = 5 inches
- In feet = 5 / 12 = 0.417 ft
- The outlet must be 5 inches lower than the inlet.