What do you do if your riser has a weir but no orifice - if you go to the Pondmaker and put in a riser, it insists that you have an orifice diameter size - it wont let you say 0. Is there a way to get around this?
-Ajidahk
Ajidahk,
The orifice parameters in the riser component refer to the hole at the top of the riser. As the pond water level reaches the crest of the riser, it first spills over and into the riser as weir flow. However if the riser is completely submerged (at higher water surface elevations), the flow into the top of the riser acts as orifice flow, which is why you must enter those parameters.
If you have orifices on the sides of the riser, those would be entered as separate orifice components, with the downstream ID set to the component that the riser discharges to (usually tailwater or a culvert). For more information on this, I would recommend following quick start lesson #1, which covers risers with side perforations.
For future technical questions like this, I would recommend contacting technical support.
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.