Applies To
	Product(s):	CivilStorm, SewerGEMS
	Version(s):	08.11.xx.xx
	Area:	Modeling
	Original Author:	Jesse Dringoli, Bentley Technical Support Group

Problem

What is the best way to model an orifice plate inside a catchbasin with surface storage above the catchbasin rim?

Solution

The most direct way to model this would be to use the Surface Storage option to account for the storage above the catchbasin, then place an orifice start control structure on the downstream pipe.

If this does not yield reliable results, model this instead as a pond with an elevation-area curve representing the volume of the cathbasin structure and surface storage together along with the orifice modeled in the pond outlet structure node.