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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 98
Disposition versions
98. The sizing of a flow control device of a non- submerged thin-walled weir type is established using equation 4-3, in the case of a trapezoidal weir.
A thin-walled weir is a weir made of a thin plate less than 5 mm thick.
A trapezoidal weir consists of 1 rectangular weir and 2 triangular weirs.
Equation 4-3: Qns = Cd × (L – 0.1 × i × H) × H3/2 + Cc × Ø × H5/2
where:
| Qns | = | Flow discharge by a non-submerged thin-walled trapezoidal weir (m3/s); | |
| Cd | = | Flow coefficient for the rectangular central part of the weir, with Cd= 1.81 + (0.22 x H/P), where P= height of the crest above the channel bottom or invest or the discharge channel (m1/2/s); if H/P < 0.3, Cd = 1.84; | |
| L | = | Length of the weir (m); for a triangle weir L = 0 m; | |
| i | = | Number of contractions: 0, 1 or 2; | |
| H | = | Height of the runoff curve above the crest (m); | |
| Cc | = | Flow coefficient for each triangle of the weir; a value of 1.38 must be used where tg-1(Ø) is between 10° and 50°(m1,5/s); | |
| Ø | = | Ratio of the horizontal distance and the vertical distance of each of the lateral walls; for a rectangular weir Ø = 0. |
In force: 2020-12-31
98. The sizing of a flow control device of a non- submerged thin-walled weir type is established using equation 4-3, in the case of a trapezoidal weir.
A thin-walled weir is a weir made of a thin plate less than 5 mm thick.
A trapezoidal weir consists of 1 rectangular weir and 2 triangular weirs.
Equation 4-3: Qns = Cd × (L – 0.1 × i × H) × H3/2 + Cc × Ø × H5/2
where:
| Qns | = | Flow discharge by a non-submerged thin-walled trapezoidal weir (m3/s); | |
| Cd | = | Flow coefficient for the rectangular central part of the weir, with Cd= 1.81 + (0.22 x H/P), where P= height of the crest above the channel bottom or invest or the discharge channel (m1/2/s); if H/P < 0.3, Cd = 1.84; | |
| L | = | Length of the weir (m); for a triangle weir L = 0 m; | |
| i | = | Number of contractions: 0, 1 or 2; | |
| H | = | Height of the runoff curve above the crest (m); | |
| Cc | = | Flow coefficient for each triangle of the weir; a value of 1.38 must be used where tg-1(Ø) is between 10° and 50°(m1,5/s); | |
| Ø | = | Ratio of the horizontal distance and the vertical distance of each of the lateral walls; for a rectangular weir Ø = 0. |
