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704.1 Slope of horizontal drainage piping.
Horizontal drainage piping shall be installed in uniform alignment at uniform slopes. The slope of a horizontal drainage pipe shall be not less than that indicated in Table 704.1.
Table 704.1
Slope of Horizontal Drainage Pipe
 
Size (inches)
Minimum Slope
(inch per foot)
2 1/2 or less
1/4
3 to 6
1/8
8 or larger
1/16
 
For SI: 1 inch = 25.4 mm, 1 inch per foot = 83.33 mm/m.

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