Solids Builder - SWMM Links - Orifice

Orifices are used to model outlet and diversion structures in drainage systems which are normally openings in the wall of a manhole, storage facility or control gate.

When you want to define a device as a Orifice, you must add the tool Orifice to the Constructor:

When adding the tool Orifice, fill in your properties, in the tool's properties frame:

In the Constructor, the following properties must be filled in:

• Identification
  • Name - name of the activity
    The point name must follow the naming rules
  • Description - when the name of the activity is not enough to give context to the activity, use the description field
• Orifice
  • Cross Section - Shape of the Cross Section, can be one of these types:
    • Circular - circular section, indicates the diameter of the section
    • Rectangular - rectangular section, indicates the width and height of the hole section
  • Discharge Coefficient - Discharge coefficient for flow through the central portion of the Weir
  • Retention Device - YES, if the Weir has a gate that prevents back flow, NO if not
  • Entrance Elevation - Entrance Elevation
  • Time to open/close - The time to open an orifice with the gate closed (or closed) in decimal hours. Use 0 or leave blank if timed opens/closes do not apply. Use control rules to adjust gate position
  • Hole Type - Hole Type:
    • Side
    • Background