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MANHOLE with INTERNAL WEIR and ORIFICES in STORMCAD

Hello -

I am using StormCAD v8i....

We have a box manhole/vault (7'x7') with a weir plate set internally to control the flow for hydromodification. The top of the weir plate is set about 3' above the inlet pipe's invert and has two orifices for low flows set at different elevations in the middle of the weir (see sketch below).

Any suggestions on how I can model this effectively in StormCAD?