Difference between revisions of "Flow through an orifice"
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Jenny Hill (talk | contribs) (Created page with " <math>Q= B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot h}</math> {{Plainlist|1=Where: *''L'' is the length of perforated pipe (m) *''B'' is the clogging factor (between 0.5...") |
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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> | ||
{{Plainlist|1=Where: | {{Plainlist|1=Where: | ||
| − | + | *''B'' is the clogging factor (between 0.5 (for matured installation) and 1 (for a new perfectly performing orifice)), | |
| − | *''B'' is the clogging factor (between 0.5 (for matured installation) and 1 (for a new perfectly performing | ||
*''C<sub>d</sub>'' is the coefficient of discharge (usually 0.61 for a plate, or 0.8 for a pipe), | *''C<sub>d</sub>'' is the coefficient of discharge (usually 0.61 for a plate, or 0.8 for a pipe), | ||
| − | *''A<sub>o</sub>'' is the area of the orifice (m<sup>2</sup> | + | *''A<sub>o</sub>'' is the area of the orifice (m<sup>2</sup>), |
*''g'' is acceleration due to gravity = 9.81 m/s<sup>2</sup>, and | *''g'' is acceleration due to gravity = 9.81 m/s<sup>2</sup>, and | ||
| − | *''h'' is the head of water over the centre of the orifice. | + | *''h'' is the head of water over the centre of the orifice (m). |
}} | }} | ||
| − | == | + | ==See also== |
| − | *[[Flow through | + | *[[Flow through perforated pipe]] |
[[category: Calculations]] | [[category: Calculations]] | ||
Latest revision as of 19:57, 17 March 2019
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:
- B is the clogging factor (between 0.5 (for matured installation) and 1 (for a new perfectly performing orifice)),
- 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),
- g is acceleration due to gravity = 9.81 m/s2, and
- h is the head of water over the centre of the orifice (m).