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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 100
Disposition versions
100. The sizing of a flow control device of a non-submerged broad-crested weir type must be established using equation 4-5, in the case of a rectangular weir.
A broad-crested weir is a weir having a thickness allowing the distribution of the pressure to be hydrostatic.
Equation 4-5: Qsp = Csp × (L – 0.1 × i × H) × H3/2
where:
| Qsp | = | Flow discharged by a non-submerged rectangular broad-crested weir (m3/s); | |
| Csp | = | Flow coefficient for a broad-crested weir determined in accordance with Table 4.1 (m1/2/s); | |
| L | = | Length of the weir (m); | |
| i | = | Number of contractions: value = 0, 1 or 2; | |
| H | = | Height of the runoff curve above the crest (m). |
Table 4.1 Flow coefficient
In force: 2020-12-31
100. The sizing of a flow control device of a non-submerged broad-crested weir type must be established using equation 4-5, in the case of a rectangular weir.
A broad-crested weir is a weir having a thickness allowing the distribution of the pressure to be hydrostatic.
Equation 4-5: Qsp = Csp × (L – 0.1 × i × H) × H3/2
where:
| Qsp | = | Flow discharged by a non-submerged rectangular broad-crested weir (m3/s); | |
| Csp | = | Flow coefficient for a broad-crested weir determined in accordance with Table 4.1 (m1/2/s); | |
| L | = | Length of the weir (m); | |
| i | = | Number of contractions: value = 0, 1 or 2; | |
| H | = | Height of the runoff curve above the crest (m). |
Table 4.1 Flow coefficient
