I recently took over maintenance at a townhouse development that has two old irrigation wells. I replaced one 23 year old timer with a new ESP and started the process of tracking down all the zones, some haven't worked for years. I have 3 zones in particular that I need help with. When I turn on the zone I can hear and feel water going through the pipes under my feet, but no water ever makes it to the surface. I was guessing that the supply line is filling up all the way to the valve and the valve is damaged or disconnected and not allowing the water to the heads... should I start searching for valves to check for problems there? Or does it sound like something else going on?