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Horizontal Drainage Pipe - Required Slopes

Minimum pitch of horizontal drainage pipes.

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Drainage piping and recommended minimum slope or pitch:

Pipe Diameter
under 3 1/4 0.02 1:50
3 - 6 1/8 0.01 1:100
8 or larger 1/16 0.005 1:200
  • 1 in/ft = 0.083 m/m
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Related Topics

  • Sanitary Drainage Systems

    The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment.

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