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− | Weird
| + | 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. |
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| + | The flow (Q), may be calculated by measuring the height of water on the sill of the weir: |
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| + | <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)}} |
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| + | ==More flow related pages== |
| + | *[[Flow in a swale]] |
| + | *[[Flow through perforated pipe]] |
| + | *[[Flow through an orifice]] |