P-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 except that where the drainage piping is upstream of a grease interceptor, the slope of the piping shall be not less than 1/4 inch per foot (2 percent slope). Building sewer force mains are not permitted. 387
SIZE (inches) | MINIMUM SLOPE (inch per foot) |
2-1/2 3 or less | 1/4a |
3 4 to 6 | 1/8a |
8 or larger | 1/16a |
* * *
Notes
387 | Amended,
Bill No. 230653 (approved December 20, 2023), effective April 1, 2024. |