Rainfall measurement definition

6.Rain measuring instruments

The fall of water droplets or ice crystals from the clouds to the ground is termed precipitation. The fall can be in nature of drizzle, rain, shower, hail, sleet or snow.

Drizzle, rain and shower are liquid water droplets, the nomenclature depending on the size of the drops and their number per unit volume.

How to measure rainfall at home

Rainfall is measured as the height of water collected in an open impermeable space by direct precipitation. Any loss by absorption, evaporation or runoff is prevented. Precipitation is measured by a rain gauge or a snow gauge.

There are two types of rain gauges-ordinary rain gauge and self-recording rain gauge.

Measurement of rainfall in hydrology

Rainfall is expressed in millimetres per day, month or year and denotes the total depth of water falling on the earth from all types of precipitation. Snow is measured as the water equivalent or directly as the depth of accumulation.

The exposure conditions of the rain/snow gauge should conform to lay down standards so that the measurements made at various places are comparable. In India the day’s rainfall is the total fall for the pre

how rain is measured in mm india

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