what do you mean by term drainage ? explain it in brief
Answers
Drainage is the system or process by which water or other liquids are drained from a place.
⏩⏩ DRAINAGE ⏩⏩
system used for making water, etc. flow away from a place..
During rain or irrigation, the fields become wet. The water infiltrates into the soil and is stored in its pores. When all the pores are filled with water, the soil is said to be saturated and no more water can be absorbed; when rain or irrigation continues, pools may form on the soil surface..
Part of the water present in the saturated upper soil layers flows downward into deeper layers and is replaced by water infiltrating from the surface pools.
When there is no more water left on the soil surface, the downward flow continues for a while and air re-enters in the pores of the soil. This soil is not saturated anymore.
However, saturation may have lasted too long for the plants' health. Plant roots require air as well as water and most plants cannot withstand saturated soil for long periods (rice is an exception).
Besides damage to the crop, a very wet soil makes the use of machinery difficult, if not impossible.
The water flowing from the saturated soil downward to deeper layers, feeds the groundwater reservoir. As a result, the groundwater level (often called groundwater table or simply water table) rises. Following heavy rainfall or continuous over-irrigation, the groundwater table may even reach and saturate part of the rootzone..
TYPES OF DRAINAGE SYSTEM:-
✔️ DENDRITIC,
✔️ DERANGED,
✔️ CENTRIPETAL AND
✔️ TRELLISED.
HOPE YOU WILL GET IT ✔️✔️✔️