How big is the fountain in Trafalgar square?

The fountains in Trafalgar Square, primarily the two that were added in 1845, feature circular basins with diameters of approximately 25 meters (82 feet). They are designed to be visually striking and serve as a focal point in the square, surrounded by historic monuments and the National Gallery. The water cascades from the upper basin into the lower one, creating an engaging visual effect.