Weir has almost the same purposes as Orifice, located in the outlet; however, it functions differently. Weir raises the water level and forces it to spill over.
| Parameter Name | Description | Default Value |
|---|---|---|
| NHYD | Hydrograph number. | — |
| NAME | Name of the component. | — |
| From Node | The name of the from node. | — |
| To Node | The name of the destinated node. | — |
| COMMENT 1, 2, and 3 | Comment for the command. | — |
| Tag | Optional category or classification. | |
| Type | Type of weir (Transverse/Sideflow/Vnotch/Trapezoidal/Roadway). | transverse |
| Height [m] | The vertical height of the weir opening. | 1 |
| Length [m] | The horizontal length of the weir crest (or crown for V-NOTCH weir). | 1 |
| Slope Side | Slope (width-to-height) of a TRAPEZOIDAL weir side wall. | — |
| Inlet Offset [m] | Depth of bottom of weir opening from inlet node invert. | 0 |
| Discharge Coeff. [CMS] | Discharge coefficient for the central portion of the weir. | 3.33 |
| Flap Gate | Select YES if the weir contains a flap gate to prevent backflow. | NO |
| End Contraction | Number of end contractions. | 0 |
| End Coeff. [CMS] | Discharge coefficient for flow through the triangular ends of a TRAPEZOIDAL weir. | — |
| Can Surcharge? | Whether it can surcharge or not (Yes/No). | NO |
| Coeff. Curve | Click on … to enter Head-Coefficient data for the weir. |  |
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