Bentley SewerGEMS supports modeling area-based orifice openings which are aligned horizontally and vertically, expressed as oriented parallel or perpendicular to flow direction, respectively. Orifices which are oriented parallel to flow do not require a datum input (since it is assumed to be equal to the opening invert).

In Bentley SewerGEMS , circular orifices are all oriented perpendicular to flow. To model an opening oriented parallel with flow, use the Orifice-Area option, or a Stand Pipe.

Related Topics

• "Orifices"
• "Submerged Orifice Hydraulics"
• "Circular Unsubmerged Hydraulics"
• "Orifice Area Unsubmerged Hydraulics"