Tenth International Course on Land Drainage-Chapter 2.3.2 1971

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1971
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Ministry of Agriculture
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The term vertical drainage will be used for drainage by means of wells, as opposed to horizontal drainage which is done by means of ditches or tiles. On the one hand an economic spacing of so costly an element as drainage wells with pumps and motors requires a certain permeability of the underground on the other hand the upper layer, to be suitable for agriculture, must have a rather fine texture. In the following discussions, therefore, a geological profile will be assumed, defined by a low-permeability upper layer, called top layer, resting on a permeable layer, called aquifer, which, in turn, reposes on an impermeable base. The occurrence of this type of profile is more widespread than would seem at first sight.
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