It's like a shower. Of course, if the water fall is too large… the weight of the water hurt you, can knock you to the ground, smash you into rocks, push you into the water, damage your eyes, make it hard or impossible to breath, etc….
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Don't swim anywhere near where the waterfall hits the plunge pool. Churning currents called hydraulics can trap you under water. River currents everywhere are stronger than you may realize. Never enter the water anywhere near the top of a waterfall.
You'd fall for about 4 seconds before hitting the ground, but that's not long enough to die from impact injury or drowning in the river below (unless you were unconscious). But if you fell from the top of the waterfall and landed on the rocks at its base… well, there's no way around it: You'd be dead.