Definitions for "Impervious"
Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air.
Not susceptible of being passed through, or penetrated. Generally refers to the percolation of water.
A solid that does not allow a liquid to pass through its surface; impenetrable.[xii] In this context it refers to the ability of rainwater to pass through unnatural surfaces around and near a building or the building's parking lot.
Keywords:  indumentum
In hydrologic terms, the ability to repel water, or not let water infiltrate
Not allowing infiltration.
forming a barrier to water in its liquid state.
forms an impassable barrier.
Reduces the movement of spillages through the backing into the sub floor
Keywords:  soaking, liquids, quality
The quality of not soaking up liquids.
Keywords:  prohibits, fluid, flow
Prohibits fluid flow.