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For combined sewers refer to Sections 18-29-1104 and 18-29-1108.
(Amend Coun. J. 5-7-03, p. 621, § 1)
Where the sanitary drainage system of an existing building is entirely replaced or substantially modified, existing building drains under concrete slabs and existing building sewers that will serve the new or substantially modified system shall be internally examined to verify that the pipe is sloping in the correct direction, is not broken, is not obstructed and is sized for the drainage load of the new or modified plumbing drainage system to be installed. Existing building sewers and drains shall connect with new building sewer and drainage systems only when found by examination and test to conform to the new system in quality of material. The Building Commissioner shall notify the owner to make the changes necessary to conform to this chapter.
(Amend Coun. J. 10-14-21, p. 37722, Art. VII, § 3)
Existing underground building sewers, regardless of their age, may be reused in accordance with Section 18-29-301.3.
(Amend Coun. J. 11-8-12, p. 38872, § 357; Amend Coun. J. 7-29-15, p. 3537, § 4; Amend Coun. J. 10-14-21, p. 37722, Art. VII, § 3)
Horizontal drainage piping shall be installed in uniform alignment at uniform slopes. The minimum slope of a horizontal drainage pipe shall be in accordance with Table 18-29-704.1.
Size (inches) | Minimum Slope (inch per foot) |
2 1/2 or less | 1/4 |
3 to 6 | 1/8 |
8 or larger | 1/16 |
Horizontal branches shall connect to the bases of stacks at a point located not less than 10 pipe diameters downstream from the stack. Except as prohibited by Section 18-29-711.2, horizontal branches shall connect to horizontal stack offsets at a point located not less than 10 pipe diameters downstream from the upper stack.
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