Question

Why do people sprinkle water on roof or open ground?

Answer 1

people sprinkle water on the roof or open ground to spread coolness in surrounding because the water when evaporated absorbs heat from the ground

Answer 2

people sprinkle water on roof or open ground in order to reduse heat
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in summer season due to lot of heat it will be difficult for us to be inside our homes therefore in order to reduce heat we sprinkle water so that the heat reduces

water has cooling property nd it takes times to get evaporated and as some amount of hear will be absorbed  by water in order to get evaporated the heat will reduce
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water is sprinkled over ground in order to prevent dust particles