Covered trenches are usually topped off with concrete slabs whose surface drainage prevents the rainwater from migrating and thereby undermining the longevity of the construction. A network of porous drains is dimensioned to evacuate this water.
Covered trenches are usually topped off with concrete slabs whose surface drainage prevents the rainwater from migrating and thereby undermining the longevity of the construction. A network of porous drains is dimensioned to evacuate this water.
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