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Taking this a step further, I'd also like to have the option of modelling irregular shaped orifices. Occasionally you do come across things like this, e.g. in the attached image. Often when in reality two different metal plates have been bolted together. Sometimes it is a rectangle over a circle, so you end up with a truncated circle. And I've also seen a circular orifice with a partially closed circular door, so you end up with a 'crescent moon' shaped opening. At present, there is no good work-around for these, as I don't believe there are any zero-length link objects to which you can give a custom shape. So you normally have to calculate the area of the irregular shape and model the opening as an equivalent area circular orifice or rectangular sluice. But this will never perfectly match the pass-forward flow rate at different upstream water depths, which can cause issues in the model if the orifice is part of a CSO structure, as predicted spill performance can be effected.