Columbia Basin, Ephrata, WA | beebe44 - 4/8/2020 07:43
I have a new to me pivot with a simple old analog panel. Does anyone have a formula to determine the application rate for different speeds and a formula to determine the amount of time per revolution at different speeds? All I know is that the pivot will do 1 revolution running at 60 percent in approximately 20 hours and at 60 percent it is putting down 0.35 inches of water. I thought I was good at math but I can't figure out a formula with these numbers to figure how fast I would have to run it to put down 0.5 inches and how long it would take for a revolution. Anyone know a formula or know how to figure it out? I can guess and check but it would be nice to have a formula.
If I was just standing at the panel without a calculator, given the numbers you have, Iād figure 20% would put down just over 1ā. (3x the water means 1/3 the speed) So to get 1/2ā you probably need to set it at about 41%.
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