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Reach The Water Table:
In some places you have to go down many feet to reach the water table; in others it is closer to the ground surface. Provided it is not nearer than a foot, you can maintain a very fine lawn without artificially draining the soil; but for most trees, shrubs, perennials and vegetables it is better that the water Table be not closer than one and a half or two feet to the surface.The lowest level of the water-table, reached at the driest time of year, is called the permanent water-table. Wells must be drilled to this level if they are to supply water throughout the year. In artesian wells [7] water is forced to the surface by hydrostatic pressure - this results from the rim of the well being below the level of the water-table in the catchment area. Artesian water is obtained from porous sandstone aquifers that underlie the Great Artesian Basin of Australia. These aquifers are supplied with water from the rain that falls on the Eastern Highlands.
It is possible that you will strike water as you dig the holes. They may flood to some level below the surface. If they do, this level is that of the water table. Below the water Table all spaces between the soil particles are filled with water, and the roots of grasses cannot grow there.
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