Precipitation and types of precipitation - Civil Engineering

Saturday, 10 February 2018

Precipitation and types of precipitation

PRECIPITATION:

The water which comes back to the surface of the earth in its various forms like rain, snowhailetc. is called precipitation. A major part of the precipitation occurs in the form of rain and a minor part of the precipitation occurs in the form of snow. Other forms of precipitation such as hail, sleetmistare very small and generally ignored.

Types of precipitation

Cyclonic precipitation:

 It is of following two types

1.frontal type: front is a boundary joining warm moist air mass resulting in the precipitation of the moist air mass.

2.Non-frontal type: in this cold air mass moves whereas moist air mass is stationary.

Convective precipitation:

It is caused due to the upward movement of the air that is warmer than its surroundings. generally, it occurs in tropics, where on a hot day ground surface gets unequally heated causing the warmer air to lift up and colder air comes to replace it. At higher altitudes, it gets cooled and precipitates.

Orographic precipitation: 

When moving warm air is obstructed by some barriers such as mountain, the moist air mass finds its way upwards where it gets cooled and precipitates.

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