A Floating Anchor is an advanced technique similar to a guided rappel. There are a couple of different methods of making a Floating Anchor providing that the force and flow of the water will allow us to use it. When using a Floating Anchor it is important to travel along the rappel line as quickly as possible by not introducing a vector and pulling the anchor away from the waterfall lip.
To make a floating anchor, attach a rope to the either to the top handle of a rope bag / back pack with the mouth of the bag open. Throw the bag to the waterfall lip, or let the bag be dragged to he waterfall lip. Once at the lip, allow the bag to be constantly be filled with the water from the waterfall. It is important to allow approximately 1 metre of extra length over the waterfall lip before tying off the rappel line. This extra length will help compensate when someone is on the rappel line.
The second method is to use a double floating anchor. A double floating anchor involves using a smaller bag to throw over the waterfall lip to help drag a larger bag that will be used for the anchor. This technique is quite useful when you have a wide distance to play with and the larger bag cannot be thrown efficiently. The same principle applies as a standard Floating Anchor.