Difference between revisions of "Flow through an orifice"
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− | + | Orifices are simply holes which restrict the flow of water. They may be used at the bottom end of an LID practice to add some [[flow control]]. | |
<math>Q= B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot h}</math> | <math>Q= B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot h}</math> |
Revision as of 22:37, 20 November 2018
Orifices are simply holes which restrict the flow of water. They may be used at the bottom end of an LID practice to add some flow control.
Where:
- L is the length of perforated pipe (m)
- B is the clogging factor (between 0.5 (for matured installation) and 1 (for a new perfectly performing BMP)),
- Cd is the coefficient of discharge (usually 0.61 for a plate, or 0.8 for a pipe),
- Ao is the area of the orifice (m2/m),
- g is acceleration due to gravity = 9.81 m/s2, and
- h is the head of water over the centre of the orifice.