Which system provides water for the main drainage system?

The fire-main system is specifically designed to supply water for firefighting purposes, which includes providing water for the main drainage system in the context of fire emergencies. Fire-mains are typically larger pipes that are strategically installed to ensure a reliable supply of water can be accessed quickly in case of a fire, allowing for effective fire suppression efforts.

In addition to that, fire-mains are connected to various firefighting components, such as hoses, hydrants, and sprinkler systems, making it integral to the overall function of water supply during such emergencies. Thus, it serves as the main source of water when drainage and fire-fighting action is required simultaneously.

The other systems mentioned, while related to water supply, serve different purposes. An emergency water supply might serve as a backup for critical systems but is not specifically aimed at drainage. The hydrant system, while part of the fire protection system, relies on the fire-main for water and is intended for direct firefighting rather than main drainage. Lastly, a sprinkler system is designed to activate automatically in case of fire by distributing water over a designated area and does not primarily function to provide water for main drainage.