Lawn Irrigation Systems – High Hazard or Low Hazard
Commentary – By Fred Baird – Bac-Flo Unlimited, Inc.
The following is a review of irrigation systems, their operation and considerations in the determination of high hazard (Health Hazard) cross connection or low hazard (Non-Health Hazard) cross connection classification.
One of the first things the average person must understand is the fact that water pressure goes from a higher pressure to a lower pressure. Water pressure is not always constant and there are many variables that create these backflow situations. These situations can be very minute such as a pressure fluctuation caused by demand or the complete loss of water pressure due to water main breaks, fires in the area, high demand, piping design, etc. Additionally, pumps and elevations can create back-pressure situations.