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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 148
Disposition versions
148. The average water flow speed, V, during the passage of the flow having a 5-year return period must not exceed the values indicated in Table 4.7 according to the type of vegetation in place, the draining slope and the nature of the soils.
Table 4.7 Average water flow speed
| Type of vegetation in the ditch | Slope (%) | Speed (m/s) | |
| Erosion-resistant soil | Non-erosion-resistant soil | ||
| Well-rooted grass | 0-5 | 2.44 | 1.83 |
| 5-10 | 2.13 | 1.52 | |
| > 10 | 1.83 | 1.22 | |
| Short-blade grass | 0-5 | 2.44 | 1.52 |
| 5-10 | 1.83 | 1.22 | |
| > 10 | 1.52 | 0.91 | |
| Mixture | 0-5 | 1.52 | 1.22 |
| 5-10 | 1.22 | 0.91 | |
| Grasses | 0-5 | 1.07 | 0.76 |
In force: 2020-12-31
148. The average water flow speed, V, during the passage of the flow having a 5-year return period must not exceed the values indicated in Table 4.7 according to the type of vegetation in place, the draining slope and the nature of the soils.
Table 4.7 Average water flow speed
| Type of vegetation in the ditch | Slope (%) | Speed (m/s) | |
| Erosion-resistant soil | Non-erosion-resistant soil | ||
| Well-rooted grass | 0-5 | 2.44 | 1.83 |
| 5-10 | 2.13 | 1.52 | |
| > 10 | 1.83 | 1.22 | |
| Short-blade grass | 0-5 | 2.44 | 1.52 |
| 5-10 | 1.83 | 1.22 | |
| > 10 | 1.52 | 0.91 | |
| Mixture | 0-5 | 1.52 | 1.22 |
| 5-10 | 1.22 | 0.91 | |
| Grasses | 0-5 | 1.07 | 0.76 |
