boundary condition in Flow 3d
 

I have to distribute my flow to intake and to under sluice, I tried boundary condition of specified pressure at fluid fraction 0 at outlet of under sluice and specified pressure at known fluid elevation at outlet of settling basin.
But the distribution is slightly less at settling basin and slightly more at under sluice..

How can I limit the volume of flow at outlet of undersluice..
Can I use volume flow rate with fluid fraction 0 at undersluice ?
which boundary condition will work ?

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