Rhythmic water dynamics with rainbows in Catania

by Silva Wischeropp

This photographic, abstract architectural image was taken on 29 December 2024 in the afternoon hours with the NIKON D800 (lens: NIKKOR 24.0-70.0 mm f/2.8). I discovered this fountain in Catania on the island of Sicily.

The interplay of water and the sun's reflection produced a beautiful rainbow on the right-hand edge of the fountain. The seated sculpture looking up into the sky in combination with the high jets of water create an impressive image ensemble.

The water dynamics of fountains are based on the principle of water pressure, which today is usually generated by electric pumps that transport water upwards. In the past, the pressure was generated by the gravity of a high water tank, the height of which determined the maximum jet height. In addition, the shape of the nozzle mouthpiece influences the shape and pattern of the water jet, while the continuous circulation of water improves the water quality and introduces oxygen.
Basic principles of water dynamics
Pressurisation:
Today: electric pumps draw water from a reservoir (e.g. pond or basin) and push it up through pipes, building up pressure.
In the past: The water was channelled through the pipes by gravity from a higher location (e.g. water tower, natural slope), with the height of the reservoir determining the pressure and jet height.
Jet shape and height:
Nozzle: the shape of the mouthpiece at the end of the pipe determines the shape of the water jet.
Height: The height of the water jet is directly dependent on the water pressure. However, the maximum height is always slightly lower than the original height of the water tank.
Regulation: The water pressure can be regulated using sliders to control the height of the water jet.