A | = | Flow section of the orifice (m2); | |
Q̅ mes | = | Average outlet flow of the dry retention system to discharge the runoff volume to be treated (m3/s); | |
C | = | Discharge coefficient of the orifice minimum value: 0.60; | |
9.81 | = | Gravitational acceleration (m/s2); | |
H1 | = | Vertical distance between the centre of the orifice and the average water level reached upstream of the orifice; the average level corresponds to the average between the maximum level and the level of the centre of the orifice; | |
H2 | = | Vertical distance between the centre of the orifice and the water level downstream of the orifice (m); if the downstream side of the orifice is not submerged and is free-flowing, then H2=0. |
A | = | Flow section of the orifice (m2); | |
Q̅ mes | = | Average outlet flow of the dry retention system to discharge the runoff volume to be treated (m3/s); | |
C | = | Discharge coefficient of the orifice minimum value: 0.60; | |
9.81 | = | Gravitational acceleration (m/s2); | |
H1 | = | Vertical distance between the centre of the orifice and the average water level reached upstream of the orifice; the average level corresponds to the average between the maximum level and the level of the centre of the orifice; | |
H2 | = | Vertical distance between the centre of the orifice and the water level downstream of the orifice (m); if the downstream side of the orifice is not submerged and is free-flowing, then H2=0. |