Tenth International Course on Land Drainage- Notes on Chapter 2.2.2 1971

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1971
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Irrigation and Drainage Research
Abstract
The object of drainage is to remove excess water from the soil profile in such a way that an - economic - optimum control of high soil moisture conditions in respect to crop yields will result. This object can only be achieved when the excess water occurs as free water, i.e. under a positive pressure. 1~en the water in the soil occurs under negative pressure, i.e. less than atmospheric pressure it will not enter a drain and consequently cannot be removed from the profile by drainage.
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