I'm trying to write a character who drowns herself in a river/lake, exactly how would she go about that? Afaik, the body has some sort of reflex against drowning (duh), and normally floats to the surface too. Is there any 'trick' to it, or really just making sure you've got enough weights to drag you down (also how much extra weight would it take to overcome the buoyancy of a ~1.70m/65kg late-teen)?