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WRT tree root depth, that device is not very deep. I guess you could say it's not on the surface. Where I am in Maryland we have been very hot and dry for about six weeks, and at my house we have managed to miss most everything from the spotty thunderstorm activity-which has been rare. There are older plantings like a few hydrangeas that are about 50 years old that have required watering. Once a tree is established, unless the root system has been compromised, it should not require watering. For a newer planting or a compromised tree, you might take a few 5 gallon buckets and drill a few holes in the bottom...fill them and set them under the drip line of the tree to allow a slow (but limited) soaking.
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