The Ontario Building Code | Hydraulic Loads on Horizontal Storm Drains
7.4.10.9. Hydraulic Loads on Horizontal Storm Drains
(1) The hydraulic load that is drained to a horizontal storm drainage pipe shall conform to Table 7.4.10.9., based on the size and slope.
Table 7.4.10.9.
Maximum Permitted Hydraulic Load Drained to a Horizontal Storm drainage Pipe
Forming Part of Sentences 7.4.10.9.(1) and 7.4.10.10.(2)
| Item | Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 | Column 7 | Column 8 |
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| Size of Drain or Sewer, in. | Maximum Hydraulic Load, L |
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| Slope(1) |
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| 1 in 400 | 1 in 200 | 1 in 133 | 1 in 100 | 1 in 68 | 1 in 50 | 1 in 25 |
| 1. | 3 | ------ | ------ | ------ | ------ | ------ | 2 770 | 3 910 |
| 2. | 4 | ------ | ------ | ------ | 4 220 | 5 160 | 5 970 | 8 430 |
| 3. | 5 | ------ | ------ | 6 760 | 7 650 | 9 350 | 10 800 | 15 300 |
| 4. | 6 | ------ | ------ | 10 700 | 12 400 | 15 200 | 17 600 | 24 900 |
| 5. | 8 | ------ | 18 900 | 23 200 | 26 700 | 32 800 | 37 800 | 53 600 |
| 6. | 10 | ------ | 34 300 | 41 900 | 48 500 | 59 400 | 68 600 | 97 000 |
| 7. | 12 | 37 400 | 55 900 | 68 300 | 78 700 | 96 500 | 112 000 | 158 000 |
| 8. | 15 | 71 400 | 101 000 | 124 000 | 143 000 | 175 000 | 202 000 | 287 000 |
Notes to Table 7.4.10.9.:
(1) Slope is the ratio of rise to run, in whatever measurement units are chosen.