What are fast and slow runoffs?

Fast runoff refers to the rapid movement of water from precipitation or melting snow into streams and rivers, typically occurring within hours or days. This type of runoff is influenced by factors such as soil saturation, land use, and topography, often leading to quick increases in water levels and potential flooding. Slow runoff, on the other hand, involves water that infiltrates the soil and moves more gradually, taking days to weeks to reach water bodies. It is essential for groundwater recharge and helps maintain stream flow during dry periods.