Least desirable fire hydrants are typically located in what type of main setup?

Fire hydrants located in a dead end mains setup are considered least desirable because this configuration can lead to several issues related to water flow and quality. In a dead end main, water is not continuously circulated, which can result in stagnation. Stagnant water can lead to lower water quality due to potential sediment buildup and an increase in the growth of bacteria or other pathogens. Additionally, in emergencies, such as a fire, if the hydrant is located at the end of a pipe with no further outlets, it may not provide sufficient water pressure or flow needed for effective firefighting.

Contrastingly, looped mains create a more efficient network that allows for continuous water movement, improving water quality and maintaining pressure. Dual supply mains are designed for redundancy and reliability, providing multiple pathways for water to reach hydrants. High-capacity mains are built to deliver large volumes of water, enhancing firefighting capabilities. All these configurations are preferable compared to dead end mains when it comes to the functionality and reliability of fire hydrants.