We've finally built some raised beds for veggies, and for a few flowers. Now we have to figure out what kind of watering system to set up for the raised beds. We need to have something that can work on a timer for when we go away for a few days or a week. And a watering system will make things easier when we're home, too, right? Our raised beds are about 30 inches tall. (For ergonomic reasons.) They've got gravel and sand on the bottom parts, and topsoil on the top. Questions: Is it better to have a system (you know, tubes or hoses) that will go along the surface of the soil, between the plants, or is it better to have a system that is buried in the raised beds, to deliver water directly to the roots? If a buried system is better, how deep should it be? 3 inches under the surface of the soil? Six inches? What? If a buried system is better, should we use a soaker hose, or something else? Please help with your wisdom and experience, O garden people. I don't know what to do, but I'm sure that you know.