Using nParticle, I implemented flowing water into my design. However, nParticle cannot influence Active Bodies like by using water to push an Active Body object. nCloth objects can be pushed by nParticles, so nCloth was used for many of the objects. I had made the water high resolution so that it would look more realistic, however, the presence of so many particles could lower the resolution. To resolve this, I created an nParticle Kill plane which would cause individual nParticles to disappear if it reached a certain height. There is some very easy scripting involved. If you want to know what I did, check out this video: https://www.youtube.com/watch?v=YDE7EHdW9mM

If you want to work with nParticles, I would recommend looking at this, since it can help reduce some of the lag as you playback your animation.

Unfortunately, the bucket phases through the floor (-_-)