Difference between revisions of "Weirs"
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The most common form of weir in LID practices is a rectangular weir, in the form of a [[check dam]] or flow control in a [[swale]] or other open channel. | The most common form of weir in LID practices is a rectangular weir, in the form of a [[check dam]] or flow control in a [[swale]] or other open channel. | ||
| + | |||
The flow (Q), may be calculated by measuring the height of water on the sill of the weir: | The flow (Q), may be calculated by measuring the height of water on the sill of the weir: | ||
<math>Q=\frac{2}{3}C_{d}\cdot L\sqrt{2g}\cdot H^{\frac{3}{2}}</math> | <math>Q=\frac{2}{3}C_{d}\cdot L\sqrt{2g}\cdot H^{\frac{3}{2}}</math> | ||
| + | {{Plainlist|1=Where: | ||
| + | *''C<sub>d</sub>''= discharge coefficient (default 0.62 for a 'sharp edge). | ||
| + | *''L'' = Length of the weir (m) | ||
| + | *''g'' = Acceleration due to gravity (9.81 m/s<sup>2</sup>) | ||
| + | *''H'' = Height of water over the weir (m)}} | ||
Revision as of 17:12, 3 July 2019
The most common form of weir in LID practices is a rectangular weir, in the form of a check dam or flow control in a swale or other open channel.
The flow (Q), may be calculated by measuring the height of water on the sill of the weir:
Where:
- Cd= discharge coefficient (default 0.62 for a 'sharp edge).
- L = Length of the weir (m)
- g = Acceleration due to gravity (9.81 m/s2)
- H = Height of water over the weir (m)