Water cannon

A water cannon shoots a strong stream of water.

It can spray water very far away. People use them to put out fires. They can also wash large vehicles.

Some cannons are on big trucks. A person can use a joystick to move them. This keeps the person safe inside the truck. Some cannons even add color to the water. This helps people see where the water went. These tools are very powerful.

A water cannon is a tool that shoots water. It sends out a fast stream of water. This stream can reach dozens of meters.

People use these tools for many jobs. Firefighters use them to put out fires. Miners use them to move rocks or dirt.

They are also used to wash large vehicles.

Some water cannons are mounted on big trucks. These are used for riot control. This means they help police manage large crowds. Many modern trucks are very safe. The person in the truck uses a joystick to aim. This keeps them away from the crowd.

Some cannons can add things to the water. They might add tear gas to make eyes sting. They can also add dye. For example, police in Hong Kong used blue dye.

This dye marks people so they can be found later. Some machines even have a mine plow. This part helps the truck push through heavy barriers on the road.

A water cannon is a powerful device that shoots a fast stream of water. It can send a large amount of water many meters away. These tools are used for many important jobs in our world. Firefighters use them to put out big fires. Miners use them to move rocks or dirt in hydraulic mining. They can also be used to wash very large vehicles.

How these machines work depends on their specific job. Most water cannons are part of a group called fire monitors. To work, they push water through a nozzle at high pressure. This creates a strong stream that travels a long distance. Some modern versions are mounted on big trucks for police work. The person driving the truck uses a joystick to aim the water. This allows the operator to stay safe inside the vehicle.

People have used water to manage crowds for a long time. In 1892, police in Athens used water pumps to move a crowd. By the 1930s, Greece began using motorized fire engines for this work. The first truck-mounted water cannon for police was used in Germany in the early 1930s. Fireboats were also important for early water control. New York City deployed its first fireboat, Marine 1, on February 1, 1891. Los Angeles commissioned its first fireboat on August 1, 1919.

There are many different types of water cannons used today. Some police vehicles in Hong Kong cost HK$16.59 million. These trucks can spray water or a chemical called nonivamide. In some places, police add dye to the water. For example, blue dye was used during protests in Hong Kong in 2019. In 1997, pink dye was used in South Korea and Indonesia. These dyes help police identify people after a crowd disperses.

Water cannons are very different from the tools you might see at home. A pressure washer has high pressure but loses power quickly. A water pistol is much smaller and has very low pressure. Some industrial water jets are even strong enough to cut through stone or metal. These cutters can move at 1 kilometer per second. Using these machines requires great care because they are very strong.

A water cannon is a high-velocity device designed to discharge large volumes of water. These machines are capable of projecting streams over dozens of meters. Because of their power, they serve several distinct roles in society. They are essential tools for firefighting and industrial mining operations. They are also used for washing large vehicles and for riot control. Most water cannons are categorized as fire monitors. This means they are built to manage high-pressure water flow effectively.

The mechanism of a water cannon relies on high pressure and volume. To function, the device pushes water through a nozzle at a high velocity. This creates a concentrated stream that can travel great distances. In modern police versions, the operation is often remote. An operator sits safely inside a vehicle and uses a joystick to aim the cannons. For example, the Austrian-built WaWe 10.000 uses three cannons that can spray in all directions. Two cannons are positioned at the front, while one is at the rear. This allows for precise control of the water stream from within the protected cabin.

Water cannons have evolved through several different stages of technology. Early crowd control was improvised and used stationary water pumps. In 1892, Athens used pumps to create what was called a "copious artificial rain." By the 1930s, Greece transitioned to motorized firefighting vehicles. These vehicles were often manufactured by firms like Fiat and Magirus. The first true truck-mounted water cannon for riot control appeared in Germany during the early 1930s. Before these trucks existed, fireboats were the primary tool for water-based control. New York City deployed its first fireboat, Marine 1, on February 1, 1891. Los Angeles commissioned its first fireboat on August 1, 1919.

Modern water cannons are often modified with different payloads to change their effect. Many models can add tear gas to the water stream to disperse crowds. Some authorities also add dyes to the water for identification purposes. In 1997, police in South Korea and Indonesia reportedly used pink dye. In Hong Kong, police used blue dye during the 2019–2020 protests. This dye can stain surfaces, such as the steps of the Kowloon Mosque in 2019. Another specialized version involves electrified water jets. In 2004, Jaycor Tactical Systems experimented with adding salt to water. This was intended to help electricity conduct through the stream. However, these experiments used jets much less powerful than standard water cannons.

There are significant differences between water cannons and other water-based tools. A pressure washer has high pressure but the force drops quickly over short distances. Water pistols are much weaker in both volume and pressure. In contrast, industrial ultra-high pressure water jet cutters are extremely powerful. These cutters can move at 1 kilometer per second. They are strong enough to cut through granite, concrete, and even Kevlar. Because of this extreme power, industrial water use carries risks of accidental death.

Different countries use these vehicles in various ways and capacities. In Germany, the Wasserwerfer 10000 is the standard model used by riot police. These units are part of a fleet of approximately 50 vehicles. In Israel, water cannons are a major export. A company called Bet Alpha Technologies has sold them to countries like Russia, China, and the United States. Israeli police models are highly advanced. They feature a joystick, cameras, and a mine plow to push through barricades. These vehicles can spray water, paint, or gas in pulses reaching 40 meters.

The history of these machines also includes significant social impact. In the 1960s, the United States used water cannons and hoses during civil rights marches. In 1963, Eugene "Bull" Connor ordered their use in Birmingham, Alabama. The sight of water being used against protesters and children was widely viewed as shocking. This imagery helped shift public sympathy toward the civil rights movement. In Australia, the New South Wales Police Force bought a cannon in 2007. However, it was never used for civil unrest and was eventually converted into a water tanker for fire departments.