I found a very informative and interesting video about pre-hospital treamtment for drowning victims.
You may view it here;  https://vimeo.com/user29371773/lwbdrowning
The entire lecture is interesting but of particular interest to me was the personal watercraft surf rescue portion that started at about 15:00 of the video, the hypoxic arrest information at about 22:00 and in water resuscitation  at 25:00. 

You can see drowning statistics for B.C. at; http://www.redcross.ca/training-and-certification/swimming-and-water-safety-tips-and-resources/drowning-research