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Updated: May 13, 2025
The under-drains carry off very rapidly the water imbibed by the soil from precipitation, and through infiltration from neighboring springs or other sources of supply.
Details cannot be fully considered here; but as a general rule it may be said, that where the subsoil generally is of an impervious character, and where the road is more or less wet and weeping after long rains, a continuous system of under-drains is required.
In England, under-drains are not generally laid below the reach of daily variations of temperature, or below a point from which moisture, if not carried off by the drains, might be brought to the surface by capillary attraction, and evaporated by the heat of the sun. Instructions pratiques sur le Drainage, pp. 227, 228.
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