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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 143
Disposition versions
143. The average speed of water flow, V, established using equation 4-15, in the grassed ditch during the passage of the runoff flow to be treated must be less than 0.5 m/s.
Equation 4-15
where:
| V | = | Average water flow speed (m/s); | |
| N | = | Roughness coefficient during the passage of the runoff flow to be treated, Qquality; minimum value of 0.25; | |
| R | = | Hydraulic radius (m); for a trapezoidal channel R is established using equation 4-16; | |
| S | = | Longitudinal draining slope (m/m). |
Equation 4-16
where:
| y | = | Water flow level (m); | |
| z | = | Ratio of the horizontal distance over a vertical distance unit (zH: 1V); value ≥ 3; | |
| b | = | Width at the bottom of the grassed ditch (m); value between 0.5 and 2.5 m. |
In force: 2020-12-31
143. The average speed of water flow, V, established using equation 4-15, in the grassed ditch during the passage of the runoff flow to be treated must be less than 0.5 m/s.
Equation 4-15
where:
| V | = | Average water flow speed (m/s); | |
| N | = | Roughness coefficient during the passage of the runoff flow to be treated, Qquality; minimum value of 0.25; | |
| R | = | Hydraulic radius (m); for a trapezoidal channel R is established using equation 4-16; | |
| S | = | Longitudinal draining slope (m/m). |
Equation 4-16
where:
| y | = | Water flow level (m); | |
| z | = | Ratio of the horizontal distance over a vertical distance unit (zH: 1V); value ≥ 3; | |
| b | = | Width at the bottom of the grassed ditch (m); value between 0.5 and 2.5 m. |
