Question

on hot sunny days peaple sprinkle the water on ground

Answer 1

When people sprinkle water on hot ground on a sunny day, that water evaporates by taking energy from the ground, roof and surroundings. The evaporation of water causes a cooling effect because the large latent heat of vaporization of water helps to cool the hot surface.

Answer 2

while sprinkling water on the ground they tend to cool the environment
it is as follows
when we sprinkle water it evaporates on sunny day absorbing the heat 
it makes the ground cool