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Water tower

technology Maturity 11-13 Next article →

A water tower is a tall structure that holds a large tank high in the air.

Ross Barnett Reservoir water tower
Ross Barnett Reservoir water tower

This height is very important for moving water to homes and businesses. The tower uses hydrostatic pressure to push water through pipes. This is a way that the weight of the water creates pressure. For every 102mm of height, it produces 1kPa of pressure. A height of 30 meters produces about 300 kPa of pressure. This is enough to meet most water needs.

Shooters Hill
Shooters Hill

The way a water tower works is quite clever. During the day, people use a lot of water. This causes the water level in the tank to fall. At night, a pump fills the tank back up.

Rooftop water towers on New York apartment buildings
Rooftop water towers on New York apartment buildings

This constant moving of water also helps keep it from freezing in cold weather. Because the tower uses gravity to push water, it can still work during a power outage. However, the tower cannot provide water for a long time without power. This is because a pump is needed to refill the tank.

People have used elevated water tanks since ancient times. Modern water towers for public systems grew in the mid-19th century. This happened as steam-pumping and better pipes became more common. In the United Kingdom, people used tall pipes called standpipes. These helped manage pulsing water flows from steam engines. By the late 19th century, standpipes grew to include storage tanks.

Standpipe water tower in Craig Nebraska
Standpipe water tower in Craig Nebraska

These tanks helped meet the needs of growing cities. Many of these old towers are now important historical sites.

Water towers can be built using many different materials. Most are made of steel or reinforced concrete. Some use wood, fiberglass, or even brick.

Roihuvuori water tower - Helsinki Finland
Roihuvuori water tower - Helsinki Finland

The tanks can be shaped like spheres, cylinders, or ellipsoids. A standard tower is about 30 meters tall. In New York City, many buildings have small tanks on their roofs. The original builders of these rooftop tanks were actually barrel makers. They used wooden walls held together with steel straps. When the wood gets wet, it swells to stop leaks.

Today, water towers do more than just hold water. Some have been turned into apartments or restaurants.

You might even see a tower used as an observation deck. Some towers are used to hold antennas for cell phone service. In some towns, people paint funny things on them. For example, two towers side-by-side might be labeled HOT and COLD.

Water tower at University of South Florida
Water tower at University of South Florida

These towers are a common part of many landscapes around the world.

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🖼️ Images & Media (18)
File:Beaumont Kansas Water Tower.jpg
Beaumont Kansas Water Tower.jpg
File:Shooters Hill.JPG
Shooters Hill.JPG
File:Ross Barnett Reservoir water tower.jpg
Ross Barnett Reservoir water tower.jpg
File:Utrecht, de watertoren aan het Lauwerhof RM514252 foto3 2015-11-01 13.59.jpg
Utrecht, de watertoren aan het Lauwerhof...
File:Rooftop water towers on New York apartment buildings.jpg
Rooftop water towers on New York...
File:Roihuvuori water tower - Helsinki Finland.jpg
Roihuvuori water tower - Helsinki Finland.jpg
File:Water tower at University of South Florida.jpg
Water tower at University of South Florida.jpg
File:Watertoren Mechelen-Zuid.jpg
Watertoren Mechelen-Zuid.jpg
File:Bankstown Reservoir.jpg
Bankstown Reservoir.jpg
File:Lahti - water tower 2.jpg
Lahti - water tower 2.jpg
File:Friedrichsplatz (Mannheim) - Wasserturm (0005).JPG
Friedrichsplatz (Mannheim) - Wasserturm (0005).JPG
File:Wrocław, Wieża widokowa , A 423 0 362 Wm padma DSC 9450.JPG
Wrocław, Wieża widokowa , A 423 0 362 Wm...

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