percolative--prophetes.ai

percolative, a. rare.
  (ˈpɜːkəleɪtɪv)
  [f. percolate v.: see -ative.]
  Having the quality of percolating or allowing percolation.

1863 Jrnl. R. Agric. Soc. XXIV. ii. 579 Separating the retentive soils from the percolative, water-bearing soils.

Oxford English Dictionary