Permeable surfaces (also known as porous or pervious surfaces) allow water to percolate into the soil to filter out pollutants and recharge the water table. Impermeable/impervious surfaces are solid surfaces that don't allow water to penetrate, forcing it to run off.

When a soil is impermeable it is called?

Materials that water cannot pass through easily are called impermeable. ... Therefore, the layer of rocks and soil above the water table is called the saturated zone. Aquifer. Any underground layer of rock or sediment that holds water is called an aquifer.

What is impermeable soil?

A soil through which water has difficulty flowing.