If you want to go all the way, you need to correct my sheet for "pressure head = atmospheric pressure" , but also for moisture content " is lack of oxigen, (sort of, depending on temperature, it gets too complicated with temperature changes).
Dar has pointed out to me he differences between prop makes and sizes. You can juggle prop factors to get good results, and you also can input atmospheric pressure in my spread sheet, even up to water density or more.
I see no way to carry this any further without departing from practical use too much.
measured data are welcome; thanks for that. I wil use them.