That seems like a ridiculously high number. I believe it uses the assumption of (area=1) in the PR calculation, which I have long argued is wrong for the type of drip systems that we have. That’s why I made the calculator that @Modawg2k refers to. Purely for a reference point for you, I have three 2 GPH emitters per tree for my trees, and my PR is 0.4 in/hr. I’d encourage you to go through the calculator to see what PR it recommends. It would be great if you could share your calculated PR and watering duration.
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