What is the function of the Overflow Pipe on a water tank?

The function of the overflow pipe on a water tank is crucial for managing the water level within the tank. Its primary role is to provide a controlled path for excess water to exit the tank when the water level rises above a certain point. This prevents the tank from overflowing and ensures that the water doesn't spill over the top, which could lead to wastage and potential damage to the surrounding area or infrastructure.

In essence, the overflow pipe acts as a safety feature, allowing for the regulated discharge of water to maintain the desired water level. By doing so, it protects the integrity of the water tank and the surrounding environment from potential hazards associated with uncontrolled overflow.

While additional storage for rainwater, controlling the water level to prevent spillage, and filtering impurities are important considerations in water management, they do not pertain to the specific function of the overflow pipe. Thus, the correct choice highlights the essential role of the overflow pipe in ensuring efficient operation and safety of the water system.