When fiber optics was just coming in, I recall some of the oil transport companies used their existing infrastructure to run fiber from one geographic area to another. The fiber was run through their oil pipe distribution system. Apparently this practice is not used with irrigation systems. In my case I would like to add a zone for a landscape plant area. My existing piping to a turf area is ideally located. By adding electric valves, one for the new landscape area and one for the turf area, there is very little new piping that needs to be added. If I were to run the wiring inside the existing water pipe, I would need to do almost no digging. I am just curious why this is never done.