 The water enters in the center of the device and after passing through the pockets in the stator and rotor exits the outside of the housing through a controlled orifice.The amount of loading is dependent on the level of water inside the housing.Some water brakes vary the load by controlling the inlet water volume only and have a set outlet orifice size depending on the desired hp to be absorbed and some control both input and output orifices at the same time which allows greater control over outlet water temperatures.