Flow sensor for water


I have a tap at my house which supplies sprinklers and a pool water leveller.

I want to alert my automation system when the water flows to either the sprinklers or the leveler. I don’t need to understand flow rate etc, just a simple alarm to say that the water is on.

Are there sensors out there that can do this? Any recommendations?

It looks like even if you don’t need a flow rate, the simpler variant is using Water Flow Sensor

Or maybe use any of the available leak sensors, but not sure if it will be easy physically to integrate into a system