Dam/ Broad Crested Weir in InfoWorks RS

[yang92]

Hi,

I am currently doing a river simulation and modelling. One part of my work include testing the river behaviour before and after the construction of a dam to determine the flood occurrence, which means I have to come out with two river models. In the case after the dam is constructed,seems that there are water accumulating behind the dam after I have run the simulations. I have attached the image of the relevant case.

Dam.png

Supposingly, there should not be any water, or the water level should not be that high as overspills/ flood tend to occur. Thus, it there any possible alternatives to reduce the water level behind the dam/ weir?