GRCA2019

Here be infiltration/exfiltration things

The slow movement of water into or through a soil or drainage system.

Penetration of water through the ground surface.

The downward movement of water through the soil, the downward flow of runoff from the bottom of an infiltration BMP into the soil.

Loss of water from a drainage system as a result of percolation or absorption into the surrounding medium (e.g., the infiltration of water into the native soil through a perforated pipe wall as it is conveyed).