An orifice 
is a command, usually located at the outlet, to reduce, measure, or restrict a flow.
| 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. | |
| System Type | Specifies the junction’s system type, whether it belongs in the overland, storm, or sanitary system. | Blank |
| Height [m] | Height of orifice opening when fully open (ft or m). Corresponds to the diameter of a circular orifice or the height of a rectangular orifice. | 1 |
| Width [m] | Width of rectangular orifice when fully opened (ft or m). | 1 |
| Inlet Offset [m] | Depth or elevation of the bottom of the orifice above the invert of the inlet node (feet or meters). | 0 |
| Type | Type of orifice (Side/Bottom). | |
| Shape | Orifice shape. | |
| Discharge Coeff. | Discharge coefficient (unitless). A typical value is 0.65. | 0.65 |
| Flap Gate | YES if the flap gate exists that prevents flow back through the orifice, or NO if no flap gate exists. | |
| Time to open/close | The time to open a closed (or close an open) gated orifice in decimal hours. Use 0 or leave blank if timed openings/closings do not apply. |
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