What size connections do some supply districts install for hydrants when volume supply is limited?

When volume supply is limited, some supply districts opt to install 2 1/2 inch connections for hydrants. This size allows for a balance between adequate water flow and the capability to connect standard firefighting hoses. The 2 1/2 inch connection has been recognized as a standard size that can efficiently deliver water in various fire scenarios, providing enough volume to support operations while not being overly cumbersome for deployment.

While larger connections (3 inch or 4 inch) could theoretically offer greater flow, they may not be practical or necessary in situations where the available supply is restricted. Conversely, smaller connections (like 1 inch) would not provide sufficient water volume for firefighting needs. Therefore, the use of a 2 1/2 inch connection strikes a practical compromise, ensuring that firefighting efforts can be adequately supported without over-sizing the hydrant infrastructure or installation.