What can cause reduced water volume or pressure from hydrants?

The correct choice indicates that a greater demand than the system can provide can cause reduced water volume or pressure from hydrants. This situation commonly occurs during times of high usage, such as when multiple firefighting operations or other major water needs are underway simultaneously. Firefighting efforts and other water consumers may exceed the available supply, leading to a drop in both pressure and volume at hydrant outlets.

When the demand surpasses the capacity of the water supply system, it can lead to insufficient flow rates, which is critical during firefighting scenarios where adequate water delivery is necessary for effective suppression efforts. Understanding this concept is vital for ensuring readiness in emergency situations and highlights the importance of maintaining a balanced water supply system for community resiliency.