Adjective : pervious soil.    From Dictionary.com. 

The perviousness of river bottoms contributes largely to their productiveness of this cereal.    From Wordnik.com.  [The Commercial Products of the Vegetable Kingdom Considered in Their Various Uses to Man and in Their Relation to the Arts and Manufactures; Forming a Practical Treatise & Handbook of Reference for the Colonist, Manufacturer, Merchant, and Consumer, on the Cultivation, Preparation for Shipment, and Commercial Value, &c. of the Various Substances Obtained From Trees and Plants, Entering into the Husbandry of Tropical and Sub-tropical Regions, &c.] Reference

Taking as a model the expression 'transparent' for the perviousness of a substance to light, we may say that the air, when in a state of acoustic vibration, becomes 'trans-audient' for astral impulses, and that the nature of these vibrations determines which particular impulses are let through.    From Wordnik.com.  [Man or Matter] Reference

In the emission from both of these sources we have a mixture of obscure and luminous rays; but the ratio of the latter to the former, in the lime light is greater than in the spiral; and, as the very meaning of transparency is perviousness to the luminous rays, the emission in which these rays are predominant must pass most freely through transparent substances.    From Wordnik.com.  [Scientific American Supplement, No. 365, December 30, 1882] Reference

From their perviousness to stellar light, and other considerations.    From Wordnik.com.  [Fragments of science, V. 1-2] Reference

The durability of a rock may depend on its perviousness to water which may enter along planes of bedding or incipient fracture planes, or along the minute pore spaces between the mineral particles.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

Not until he actually stood upon the peak did he know that there was the earthly hitherto -- the final obstacle of unobstancy, the everywhere which, from excess of perviousness, was to human foot impervious.    From Wordnik.com.  [Sir Gibbie] Reference

It is a lesson on the principles of human nature; on the delusiveness of appearances; on the perviousness of fraud; and on the power with which nature has invested human beings over the thoughts and actions of each other.    From Wordnik.com.  [Arthur Mervyn Or, Memoirs of the Year 1793] Reference

The striking feature of this plan of drainage, worthy of note, is, that owing to the perviousness of the soil, no tap ditches are required to drain off the excess of rain water over the surface, the whole of the surplus sinking through and being carried off from below.    From Wordnik.com.  [A Guide to Capitalists and Emigrants: Being a Statistical and Descriptive Account of the Several Counties of the State of North Carolina, United States of America; Together with Letters of Prominent Citizens of the State in Relation to the Soil, Climate, Productions, Minerals, &C., and an Account of the Swamp Lands of the State] Reference

Thus the white powder, which has shown itself so powerful an absorber, has been specially selected on account of its extreme perviousness to the visible rays, and its extreme imperviousness to the invisible ones; while the dark powder was chosen on account of its extreme transparency to the invisible, and its extreme opacity to the visible, rays.    From Wordnik.com.  [Fragments of science, V. 1-2] Reference

Similarly, an architect may deepen or enlarge, in fantastic exaggeration, his original Westmoreland gable into Rouen porch, and his original square roof into Coventry spire; but he must not put within his splendid porch, a little door where two persons cannot together get in, nor cut his spire away into hollow filigree, and mere ornamental perviousness to wind and rain.    From Wordnik.com.  [Val d'Arno] Reference

Diathermancy, or perviousness to radiant heat, 173.    From Wordnik.com.  [Six Lectures on Light Delivered In The United States In 1872-1873] Reference