cubic foot/second [ft^3/s] Unit Converter

Definition of cubic foot/second [ft^3/s] unit

A cubic foot per second (ft³/s or cfs) is a unit of volumetric flow rate equal to one cubic foot of fluid passing a point in one second. It measures discharge in channels, pipes, rivers, and ventilation systems.

History of cubic foot/second [ft^3/s] unit

The cubic foot per second emerged from English customary measurement, where the foot and cubic foot were established units of length and volume. As engineering developed in the nineteenth century, practitioners combined cubic feet with the second to quantify water delivery and river discharge. The unit became especially common in the United States through hydrology, civil engineering, irrigation, and public-works practice. Although metric units are internationally preferred, cfs remains deeply embedded in American stream gauging, flood studies, dam operations, and water-rights administration, supported by long-standing charts, instruments, and regulations.

Applications of cubic foot/second [ft^3/s] unit

Today, cfs is widely used to report river and stream flow, reservoir releases, irrigation deliveries, stormwater runoff, and wastewater discharges. Hydrologists use it in flood forecasting and watershed modeling; engineers apply it when sizing channels, culverts, pumps, and turbines. Outdoor recreation reports, such as whitewater ratings, also commonly describe river conditions in cubic feet per second.

Complete list of cubic foot/second [ft^3/s] unit conversion