Trees in urban environments often require supplemental water to survive, but how much water? The goal in watering a tree is to provide enough water to create moist soil around the root zone. Saturated soil can be as detrimental as not enough water. For young trees, the goal is to provide water at 24″ in depth.
Use a slow trickling garden hose, or tree gator to provide deep watering.
Water tips from Missoula Urban Forestry.