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Sports Turf by V.I. Stewart

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Soil and sand amelioration

C.1Soil amelioration with sand

The long-term benefits from adding sand to soil as a means of improving drainage are generally much overrated. Theoretically, silt and clay need not be present as more than 40% of the whole to fill all the pore space in the sand and thereby control drainage. However, even if the silt and clay content is reduced to just 10–15% of the whole it may still have a dramatic adverse effect on water flow, despite not filling all the pore space. Silt and clay particles are so much smaller than sand particles that they may filter down and concentrate in layers, e.g. above a filter fabric barrier. Alternatively, as one marble in the right place can control drainage through the neck of a funnel, so ...

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