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What is subsoil drainage in property development?

The installation of subsoil drainage in property development helps disperse the water on site during rainy periods.

Subsoil drains are generally provided to S, M class Sites, these sites have slightly (s), moderately (m) or highly (h) reactive clay content as water is unable to soak away. The engineer will specify a sub-soil drain at the base of the site cut which allows water run off to drain too, the water is then discharged away from the building area.