noun
permeability; water permeability
Technical term used in geology, civil engineering, and materials science to describe how easily water passes through a substance.
この土壌は透水性が高いため、水はけが良い。
This soil has high permeability, so it drains well.
透水性舗装は
Permeable pavement allows rainwater to infiltrate into the ground.
浸透性 is a broader term for permeability of liquids or gases, while 透水性 specifically refers to water.
Compound of 透水 (water permeation) + 性 (property, -ity). The exact historical derivation is uncertain, but the term follows a common pattern for technical nouns.