If it rains much and the water level is only 8 metres below,then what will be the difference?
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Answer:
All crops need water to grow and produce yields. The most important source of water for crop growth is rainfall. When rainfall is insufficient, irrigation water may be supplied to guarantee a good harvest.
One of the main problems of the irrigator is to know the amount of water that has to be applied to the field to meet the water needs of the crops; in other words the irrigation requirement needs to be determined. Too much water means a waste of water which is so precious in arid countries. It can also lead to a rise of the groundwater table and an undesirable saturation of the rootzone. Too little water during the growing season causes the plants to wilt. Long periods during which the water supply is insufficient, result in loss of yield or even crop failure. In addition, the irrigation requirement needs to be determined for proper design of the irrigation system and for establishment of the irrigation schedules.
4.1 Rainfall
4.1.1 Amount of rainfall
4.1.2 Rainfall intensity
4.1.3 Rainfall Distribution
4.1.4 Effective Rainfall
The primary source of water for agricultural production, for large parts of the world, is rainfall or precipitation. Rainfall is characterized by its amount, intensity and distribution in time.
4.1.1 Amount of rainfall
Imagine an open square container, 1 m wide, 1 m long and 0.5 m high (see Fig. 59a).
Fig. 59a. An open container to collect rainwater
This container is placed horizontally on an open area in a field (see Fig. 59b).
Fig. 59b. Container placed in the field
During a rain shower, the container collects the water.
Suppose that when the rain stops, the depth of water contained in the pan is 10 mm (see Fig. 59c).
Fig. 59c. 10 mm rainwater collected in the container
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