FANDOM


Impermeable material is rock or other material which prevents or greatly retards the flow of water. Most rock is not impermeable, nor is clay, although it will greatly retard the flow of water.

Ad blocker interference detected!


Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.