It is the amount of rainfall occured for a defined period of time.
It is calculated for desigining of sewers pipe lines and in estimation of hydrodraph.
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The prime system for moving water from the atmosphere to the surface of the earth is precipitation. At the point when the mists meet cool air above land, precipitation, like rain, sleet, or snow, is activated and water comes back to the land (or ocean). An extent of atmospheric precipitation dissipates.
Substantial precipitation happens close to the equator and diminishes with the increase in the latitude, for example, Towards polar locations. The primary source of moisture for ppt is dissipation from the seas. In this way, ppt will, in general, be heavier close to coastlines. Since the lifting of air masses is the reason for practically all ppt, the amount and recurrence of rain is generally more prominent on the windward side of the mountain as the downslope movement of air brings about to perish in stickiness, in this way, the contrary sides of hindrances as a rule experience generally light ppt. A high measure of ppt is accounted for at higher rises.