I have an Orbit Wifi B-hyve controller and a three zones manifold. I am looking for a way to determine if the water flows through the irrigation system when it should not (ex one of the valves fails or there is a crack in the system and the water leaks through that) I am not very comfortable with the idea that I will have PVC in the ground parallel with my house. This could leak and cause a basement flood before I get to know (I night time leak or while I am away could be disastrous not for the amount of water wasted but for water leaking into the basement (old house -might have foundation cracks I do not know about) What is a standard solution in situations like this ?
You could add a main solenoid valve and measure the pressure between that and the manifold, much less work then a sensitive flow sensor. Turn the manifold valves off then the main and monitor the pressure to the manifold. This could be connected to the pump output of the sprinkler controller for normal operation. This does give you redundancy so the main and one other valve have to fail.