Water falls from a height o 500m what is the rise in temp of water at bottom of whole energy remains in the water

When there is height, there is potential energy associated.
Since water is falling from a height, potential energy is stored in water.
Consider the case of 1kg of water.
E=mgh
where m=1kg, g=9.8, h=500m(given)
E=1×9.8×500
E=4900 J
This is the energy stored in water as Q.
Specifc heat of water is c=4180 J/(kg K)
But specific heat
Q= mc ∆t
​​​​​​thus ∆t=Q/mc
∆t=4900/1×4180

∆t=1.17 K