How to control the flow direction and fluid level? As you can see here, I intend to make a waterfall which is more or less has been successful. However, Once i start playing  the animation the water keeps filling up till the bounds of the domain.



I want it to fill only till this level, shown below, even if the waterfall(s) continues to flow.



In addition I want the water to follow this path/direction shown below.



I want this to look as realistic as possible, so how do I generate the water's froth? 

This is my setup file:
Try creating a box as an outflow object, it will drain the exceeding liquid. After that adjust the inlfow rate to keep the level you need steady.