The Ontario Building Code | Hydraulic Loads on Sanitary Horizontal Drain
7.4.10.8. Hydraulic Loads on sanitary Horizontal Drain
(1) Except as permitted by Article 7.4.10.7., the hydraulic load that is drained to a horizontal sanitary drainage pipeshall conform to Table 7.4.10.8., based on the sizeand slope.
(2) Horizontal sanitary drainage pipe shall be designed to carry no more than 65% of its full capacity.
Table 7.4.10.8.
Maximum Permitted Hydraulic Load Drained to a Horizontal sanitary Drainage pipe
Forming Part of Sentences 7.4.10.6.(2) and 7.4.10.8.(1)
| Item | Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 | Column 7 |
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| Drain Size, Nominal in. | Maximum Hydraulic Load, fixture units |
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| Slope(1) |
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| 1 in 400 | 1 in 200 | 1 in 133 | 1 in 100 | 1 in 50 | 1 in 25 |
| 1. | 3 | --- | --- | --- | --- | 27 | 36 |
| 2. | 4 | --- | --- | --- | 180 | 240 | 300 |
| 3. | 5 | --- | --- | 380 | 390 | 480 | 670 |
| 4. | 6 | --- | --- | 600 | 700 | 840 | 1300 |
| 5. | 8 | --- | 1400 | 1500 | 1600 | 2250 | 3370 |
| 6. | 10 | --- | 2500 | 2700 | 3000 | 4500 | 6500 |
| 7. | 12 | 2240 | 3900 | 4500 | 5400 | 8300 | 13000 |
| 8. | 15 | 4800 | 7000 | 9300 | 10400 | 16300 | 22500 |
Notes to Table 7.4.10.8.:
(1) Slope is the ratio of rise to run, in whatever measurement units are chosen.