You need to find out how much water you will need and how much water your wells can provide first. My irigation system uses 13/64" nozzles running between 35-40 psi at the nozzle inlet and put around 7.3-7.8 gpm per head. That' gives me about 0.33 inches of water per hour on a 40-45 sprinkler spacing x sprinkler throw. I have wheel line with 31 heads so thats about 233 gpm. So if I were pumping from a well, it would have to produce at least that much. But wait, I have to fill the lines so I have to have a pump that can fill the lines at about 5 psi and 300 gpm and then run at 35-45 psi @ the nozzles at 233 gpm. So my well would have to be able to supply a start up of 300 gpm.
Since I have line losses and these pressures are quoted at the nozzle, I have add the line losses to the nozzle requiremnts and size the pump pressure to provide 35-40 psi at the nozzle with the 233 gpm.
You get the picture? How much water can your well supply will dictate how many heads you can run. If you're cropping, your plants and the weather will determine the ammount of water you will have to supply. You have to match the plant demand to the water supply. If you have only so much water, that limits what you can grow and what acrage you can grow it on.
I live in the Northern Rockies and irrigate pasture. Our grass transpires about a quarter of an inch of water a day when the temps are in the 90's. I can get the w/l across the field in eleven days and lay down about 3+ inches of water at a set. In 11 days, the grass I made the first set with has used 2.75 " of water so it's a JIT(just in time) process.
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