Definify.com

Webster 1913 Edition

Adj.

Permitting liquids to pass by percolation; not capable of retaining water; porous; pervious; – said of gravelly or sandy soils, and the like.

leachy ‎(comparative more leachy, superlative most leachy)

Permitting liquids to pass by percolation; not capable of retaining water; porous.
Gravelly and sandy soils may be leachy.