From the above link:
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Myth 6: High Wing Airplanes Almost Always Flip Over During Ditchings
See Myth 5. The accident record simply doesn't support this impression. In the 179 accidents we reviewed, only one mentioned flipping over on impact. It was a high wing, fixed-gear single (a Cessna 172). But at least 60 other high wing airplanes ditched and none of the pilots reported flipping over.
Is it possible that many of the high wing airplanes flipped and the pilots were just too pumped up to notice in their hurry to exit the airplane? Sure, it's possible. After all, the accident narratives are often too sketchy to draw definitive conclusions.
But again, even if every high wing airplane flipped over on impact or cartwheeled end-over-end across the water--highly unlikely, by the way--the occupants still managed to egress successfully. That doesn't argue for complacency in attempting the smoothest, slowest speed water touchdown you can manage but it strongly suggests that worrying about a flip-over is a misplaced concern.
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Interesting read.
JAFI