How to setup boundary in SW flow simulation for a basic simulation

I'm trying, for the first time, to make a basic fluid simulation regarding an open water tank and an outlet pipe.
The problem statement can be written as follows: “what is the maximum inlet water flow rate with the existing outlet section and within the model path, with an open discharge.”

I setup the scene with gravity set to Y (open tank, so no other pressure inside the tank, just the gravity). That's the only parameters know in this case.
I can't setup a boundary for the inlet because that's what I'm looking for. Should I do it by increment, starting with a inlet mass of 0.1kg/s, and increasing to 0.15/0.20/0.25/0.30.... but can take forever.
Can SW flow simulation do increment by itself and found the limit?

I setup the outlet boundary condition to Atmospheric pressure at 101 kPa to simulate an open pipe

Thanks for your advice to solve this simulation.

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