Irrigation & Drainage Systems Engineering-open-access-journals
From its simplest definition, irrigation is that the application of water to form a condition within the soil that's favorable for
plant growth. On the opposite hand, voidance is that the removal of excess water from the soil to form a condition within the soil that's favorable for
plant growth. voidance are often either natural or artificial. several areas have some natural drainage; this suggests that excess water flows from the farmers' fields to swamps or to lakes and rivers. There square measure 2 kinds of artificial drainage surface drainage and subsurface drainage. style OF SUB-SURFACE DRAINAGE SYSTEMS Sub-surface voidance is that the removal of excess groundwater below the soil surface. It aims at increasing the speed at that water can drain from the soil, then lowering the groundwater level, therefore increasing the depth of drier soil higher than the groundwater level.
NEED FOR DRAINAGE :
Throughout rain or irrigation, the fields become wet. The water infiltrates into the soil and is keep in its pores. once all the pores square measure crammed with water, the soil is alleged to be saturated and no a lot of water are often absorbed; once rain or irrigation continues, pools could kind on the soil surface
Part of the water gift within the saturated higher soil layers flows downward into deeper layers and is replaced by water infiltrating from the surface pools.
When there's no a lot of water left on the soil surface, the downward flow continues for a jiffy and air re-enters within the pores of the soil. This soil isn't saturated any longer.
However, saturation could have lasted too long for the plants' health.
Plant roots need air additionally as water Associate in Nursingd most plants cannot face up to saturated soil for long periods (rice is an exception).
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