Are we using the latest averages for what normal precip is? We are up like 7 to 8 inches compared to 30 or 40 years ago I believe.
So if the trees were doing just fine with 40 inches of rain, why do we need to maintain our current 50 inches of rain for them to do well?
I think precip distribution is more important than annual totals, because the same trees are still out there from when they were only getting 40 inches and they did just fine.