subirrigate
verb (used with object)
to irrigate beneath the surface of the ground, as with water passing through a system of underground porous pipes or transmitted through the subsoil from ditches, etc.
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In some orchards on low land only a few feet above the water-level, where a sandy subsoil admits of a free natural subirrigation, the thrift and productiveness of the trees have been unusually good.
From The Apple by Various