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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 144
Disposition versions
144. The water flow level, y, in the grassed ditch during the passage of the runoff flow to be treated must be less than two-thirds the height of mowing of the vegetation, or mature vegetation present in the ditch where no maintenance is carried out, without exceeding 80 mm.
The water flow level, y, is established by iteration using equation 4-17:
Equation 4-17: Q = A × V
where:
| Q | = | Flow into the ditch (m3/s); | |
| A | = | Area of the flow section, for a trapezoidal channel, , A = by+zy2 (m2); | |
| V | = | Average water flow speed (m/s); |
In force: 2020-12-31
144. The water flow level, y, in the grassed ditch during the passage of the runoff flow to be treated must be less than two-thirds the height of mowing of the vegetation, or mature vegetation present in the ditch where no maintenance is carried out, without exceeding 80 mm.
The water flow level, y, is established by iteration using equation 4-17:
Equation 4-17: Q = A × V
where:
| Q | = | Flow into the ditch (m3/s); | |
| A | = | Area of the flow section, for a trapezoidal channel, , A = by+zy2 (m2); | |
| V | = | Average water flow speed (m/s); |
