Final answer:
The great height of water tanks in water supply systems of many towns serves the purpose of creating pressure in the distribution system.
Step-by-step explanation:
The purpose of the great height of water tanks used in water supply systems of many towns is to create pressure in the distribution system. When water is pumped into the tank at a high elevation, the potential energy of the water is converted into pressure. This high pressure allows the water to flow through the pipes and reach the various locations in the town with sufficient force.
For example, if a town is located on flat land, without the height of the water tank, the water would not have enough pressure to reach all the buildings and homes. The elevated height of the water tank ensures that enough pressure is built up to push the water through the pipes and supply water to the entire town.
Furthermore, the height of the water tank also helps to regulate water pressure and maintain a consistent flow, especially during periods of high demand when multiple people are using water simultaneously.