Jump up onto the platform to get past the falls. Swim to this platform with the statues on it, then ahead and to the right. Ascend the steps. A series of jumps lies at the end of this walkway. Each of the single squares should be an easy single jump.
Force push the lever at the wide gap over the water and a bridge extends.
Follow the path, taking out any battle droids along the way, until it ends in an open space held by three battle droids. There's another lever to Force push. This one controls a dam. Once the water level lowers, be careful to cross on the dam. If you're downstream from it, you'll be swept over the falls.