Drop lines

I know this is Bass so many times but I’m just not understanding the math behind this. I’m looking for some help for this season to get a better water schedule hopefully save some money. I have a row of arborvitae that are
3 feet apart
Each has a 5 ft ring of drip emittors each at .5 per hour totaling @2.5 per hour for the whole ring. How can I determine what my in per hour is ? Root depth is 12 in w/ 2 maybe 3 in of mulch on top not sure if that helps

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