Hi,
We have a Storm Drainage network with Soakaways scattered along the ROW and all interconnected with overflow pipes. The overflow lines are achieved with a control structure in the pipe line. However, I have modelled the network but at certain locations, the HGL seems peculiar which is running below the pipe invert and in V shape. The overflow connection is same as any other upstream/Downstream overflow pipes(Refer to screenshots below) where HGLs are running normal. Appreciate if anyone can elaborate this unusual
behavior of HGL.