Aquaticou. Please give your thaughts on the following scenario.
1. Residential unit development. 2. Subsoil or sub Mulch micro spray irrigation. 3. controlled by computer opperated solenoid valves. 4. Council footpath area 4m wide w/pop ups at footpath edge spraying towards boundary, controlled by computer opperated sollenoid valves.
Only an RPZ valve for full protction, pressure vacuum breaker would not meet the requirements if you have elevation differences.
We always question the Degree of Danger, what would determine the best backflow protection method.
We had a job like yours where we used a air gap over a water tank with a pump that supplied the water needs of a nursey and then they mixed all the chemicals they wanted to with no problem with backflow or yearly backflow maintence.