Saenz v. Whitewater Voyages, Inc. (1990) 226 Cal.App.3d 758; Ferrari v. Grand Canyon Dories (1995) 32 Cal.App.4th 248; 

Saenz v. Whitewater Voyages, Inc. (1990) 226 Cal.App.3d 758; Ferrari v. Grand Canyon Dories(1995) 32 Cal.App.4th 248; cases involving waiver and assumption of the risk of severe whitewater rafting injuries.