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Flow around weirs
I am working on a river case study and in my case water levels are regulated with two weirs. However water levels around my upstream weir (two weirs located next to each other) are too large (50 cm) compared to the measurements at that specific location. Would someone want to clarify how flow is regulated around weirs and how I need to setup a weir in the middle of a river because, it seems that flow is somehow flowing around my weir and not over it? Maybe this has something to do with submerged or free flow or that two weirs next to each other cause a leekage?
(I also changed the manning roughness and the water levels are still significantly large)