Question

what is drainage ?who it is useful?

Answer 1

Hi friend here is your answer

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Drainage is the natural or artificial removal of surface and sub-surface water from an area.

Many agricultural soils need drainage to improve production or to manage water supplies.

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Answer 2

The system of water or waste liquids flowing away from somewhere into the ground or down pipe is called drainage.
It is useful because :
1. Drainage ensures that the soil is properly aerated
2. If you have excess or standing water it can choke your crops. Drainage reduces soil nutrient loss from runoff and can help avoid soil erosion
3. Drainage can be collected and save for future use during periods of dry water