Gravity flow refers to the movement of fluids, such as water or air, driven by the force of gravity. This natural phenomenon occurs when a fluid moves from a higher elevation to a lower elevation, allowing it to flow freely without the need for pumps or mechanical assistance. Gravity flow is commonly observed in rivers, streams, and drainage systems. In engineering, gravity flow is utilized in various applications, including sewage systems and irrigation. By designing channels or pipes that take advantage of gravity, these systems can efficiently transport fluids over long distances. This method is cost-effective and energy-efficient, making it a preferred choice in many scenarios.