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I am trying to model rain off structure like parallel spillway before WWTP (actually, it goes to sewer network but it's the same).

I am using weir (is it correct - Sideflow option??? ), and would like to add dimension of straight weir and of whole structure, such as length of weir, it's height, area of structure before weir to determine volume of water before WWTP entrance. Also, would like to model space (like retention space) after weir where water (part that goes over weir) stands before entering pipe that leads to river or something else, so I can control flow that goes out of structure to recipient, because I don't want to put huge flow to small channel immediately. Or it should be made with weir - oriffice combination? Oriffice after weir, for rain off water? Or should I use Storage unit for inflow and then weir for rain off water? In that situation I cannot enter Storage - Weir structure because it's actually the same structure, but length of weir is actually length of Storage unit. I can calculate area of Storage unit and enter it, with length of weir being one part of Storage area and calculating other one. Would that be OK?

Area between WWTP and weir and area after weir before channel concerns me - is SWMM capable of modeling that kind of structure?
Flow until some level would go to WWTP and bigger, when rain occurs; would go over spillway directly through channel to recipient. Of course, some height-flow relation would be calculated and entered.

I know I complicated it a bit :) I made a small scheme of a structure, I have attached it to be more clear.
Also, I made a small scheme how would I try to model it in SWMM, I think that should be OK.

Thanks!