Irrigation systems work great for grass but not so great for trees.  Sprayer heads especially can lose much water through evaporation when it is this dry. New trees are best watered with a slow drip hose.  Mulching  also helps retain water at the root level. Just don’t let the mulch touch the tree trunk—8-10 inches away.
https://extension.umn.edu/planting-and-growing-guides/watering-newly-planted-trees-and-shrubs

I would like to see a picture of the base of the tree.  Maples are often planted too deep and develop root problems.  
https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/environmental/girdling

Attached are the pictures of the base tree trunk you requested.

It was planted way too deep.  You can see how the bark has deteriorated.  Keep pulling the soil away until you can see the roots coming out from the trunk.  Check for any roots circling around the tree.  If no circling roots keep dirt off the roots.  If circling roots check with a arborist. Circling roots can slowly strangle/kill a tree.  Maple trees are especially prone to this problem.  An arborist can clean and cut circling roots if they aren’t too bad. Trees like  this maple often blow over in storms because they can bend and stretch with the wind if the root flare and circling root issues are not corrected.

1. https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/maple/leavesbrown.html
2. https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional
The immediate problem is not enough water. Watering is crucial for new trees to establish a strong root system. The tree might drop some of those leaves and regrow new ones this summer if watered properly. See the website above for information on watering trees.