What kind of fruit trees? How many inches of diameter and how many feet of trunk? What's the dripline and what type of soil?
Your local extension can help you with the watering requirements or you can click here
When you say 3' well, you mean dam? Id say you can use a bubbler, if the soil reaches it's saturation point, the dam will fill up and allow the water to perculate evenly to the root zone.
"Those who cannot remember the past are condemned to repeat it".
I've noticed everyone who is for abortion has already been born.