In deep water the canoe rescue can be accomplished by sliding one canoe out of the water, and onto another canoe. Then turn the dumped canoe right side up and slide it into the water. While the canoe is in the water and submerged, it should be kept clear of all immovable objects which are in the current. Some canoeists have been observed to tie their paddles to the canoe. If that canoe spills and their feet become tangled in the loose rope, they would not have the opportunity to make that mistake again.
Loose ropes can be deadly.
Someone on each trip should have maps, and know the location of the nearest road at all times. It may be five minutes out by foot and an hour out by the stream. The locations of medical assistance should also be known. Canoeists in each canoe should also be able to see the canoes in front and behind. Common sense also dictates courtesy.