Due to surface tension, hitting water at speed is actually worse than hitting concrete. As a sibling comment stated, from his injuries, he almost certainly land

Due to surface tension, hitting water at speed is actually worse than hitting concrete. As a sibling comment stated, from his injuries, he almost certainly landed feet first. His shattered feet and hips absorbed enough of the impact that he was able to survive. The unopened chute would also have slowed him down somewhat [EDIT: and presumably served to orient him "properly" for landing].