Cubic Feet Per Second (CFS) is a unit of measurement used to express the flow rate of liquids or gases. It indicates how many cubic feet of a substance pass through a specific point in one second. This measurement is commonly used in fields like hydrology, engineering, and environmental science to assess water flow in rivers, streams, and drainage systems. Understanding CFS is essential for managing water resources and designing infrastructure. For example, engineers use CFS to determine the capacity of pipes and culverts to ensure they can handle expected water flow during storms or floods.