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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. |
| | 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> |