Back flow means water flowing backwards into the water supply system. There are two ways back flow can enter the water supply from a sprinkler system; back siphonage and back pressure. Back siphonage happens when the pressure in the water supply suddenly drops. Pressure drops can happen because of nearby fire fighting or repairs of breaks in the Town water main. The pressure drop creates a vacuum, sucking the water backward through the system. The vacuum is much like a person sipping on a straw, which causes liquid to flow in the opposite direction. Back pressure is also reversal of water flow in the water system. However, this type of reversal happens when water pressure increases on the customer's side of the water system. Examples of things that can cause pressure increases in your sprinkler system would be injection fertilizing or blowing out the system in the fall.
Send backflow reports to Utility Supervisor Charwon Walter at email@example.com.