Irrigation has the following main classes:
Flow Irrigation: Flow irrigation is that type of irrigation in which the supply of irrigation water available is at such a level that it is conveyed onto the land by gravity flow. Flow irrigation may be further divided into perennial irrigation system and inundation or flood irrigation system. In perennial irrigation system, the water required for irrigation is supplied in accordance with the crop requirements throughout the crop period. Inundation irrigation is carried out by deep flooding and through saturation of the land to be cultivated, which is then drained off prior to the planting of the crop.
Lift Irrigation: Lift irrigation is practised when the water supply is at too low a level to run by gravity onto the land. In such systems, water is lifted up by mechanical means.
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