Which type of standpipe system relies on the fire department to provide all the water?

A dry standpipe system requires the fire department to supply all the water used for firefighting operations. This system does not contain water within the pipes under normal conditions; instead, it is designed to have firefighters connect hoses to the system and use a fire engine or other water source to supply water through the standpipe when needed. The dry standpipe is particularly useful in buildings where the risks of freezing or water damage are a concern, allowing for rapid deployment once firefighters are on the scene.

In contrast, a wet standpipe system is always filled with water and can provide immediate access to water without delay. A combination standpipe system contains both wet and dry components, which can be advantageous for various types of emergency situations. An automatic standpipe system typically integrates with a building's sprinkler system and delivers water automatically upon activation, making it reliant on its own water supply. Therefore, the distinguishing feature of the dry standpipe system is its dependence on external fire department resources for water delivery.