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704.1 Slope of Horizontal Drainage Piping
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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).
| SIZE (inches) | MINIMUM SLOPE (inch per foot) |
| 21/2 or less | 1/4a |
| 3 to 6 | 1/8a |
| 8 or larger | 1/16a |
For SI: 1 inch = 25.4 mm, 1 inch per foot = 83.33 mm/m.
- Slopes for piping draining to a grease interceptor shall comply with Section 704.1.
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