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.