"Seepage" Natural Recordings by Native Speakers
The act or process of liquid or gas escaping or spreading through a small opening or a porous surface, typically in a slow, steady, and diffuse manner.
Example: The walls of the reservoir were cracked, leading to a seepage of water that caused a steady stream to form.
More broadly, seepage can also refer to any gradual or imperceptible leakage or flow of something such as money or ideas.