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7That they may always be dry and free from mud, the following method must be adopted. They must be dug out and drained to the lowest possible level; and on the right and left sewers must be constructed; and in the walls thereof, towards the walk, drains are laid, with an inclination to the sewer. When this is done, the place is filled in with coals; over which the walks are strewed with gravel, and levelled. Thus, from the natural porosity of the coals, and the inclination of the drains towards the sewer, the quantity of water is carried off, and the passages remain dry and unaffected by the moisture.
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