At what height should hydrants be placed in relation to mains?

Hydrants should be installed at a height of 6 inches above the top of the water main. This height is important for several reasons. First, positioning the hydrant higher than the main allows for proper drainage and prevents clogging in the hydrant, ensuring that it functions correctly during emergencies when it's needed most. Second, this height provides accessibility for maintenance and operation while ensuring that the hydrant remains fully operational. Additionally, the 6-inch elevation helps to protect the water supply from potential contamination that could occur if the hydrant were level with or below the main. This standard height helps to guarantee the safety and reliability of the water system.