How are high-rise standpipe systems characterized?

High-rise standpipe systems are characterized as wet systems with a constant water supply, which means they are always filled with water and readily available for firefighting operations. The purpose of these systems is to provide firefighters with immediate access to water in elevated buildings where traditional hose lines may not be effective or feasible. This constant water supply allows for a more efficient and effective response during emergencies, as firefighters can connect hoses directly to the standpipe and begin operations without delays in waiting for water to be supplied.

This contrasts with dry pipe systems, which are not always filled with water and typically rely on activation mechanisms to allow water to flow into the system. Manual operation is not a defining characteristic of these systems since they can be designed for automatic or manual activation. Additionally, while standpipe systems can support sprinkler systems, their purpose extends beyond just the sprinklers, making the definition of high-rise standpipe systems as being exclusive to sprinkler systems inaccurate.