Different crops have different irrigation needs, and usually you have a few options in achieving the crops water needs. The most common are drip, micro-sprays, impact sprinklers, rotators, and large impact guns.
If you have a well that you plan to use, you'll need to find out the flow in gallons per minute (GPM) that the current well and pump will provide at a decent pressure in pounds per square inch (psi). Typically, 30-50 psi is required at the well head to achieve adequate pressure throughout the system.
When using surface water for irrigation, you will need a more advanced filtration system to keep emitters clean unless you use large nozzle sprinklers. If you already have a pump, it's important to get all the details about it and to find out what water flow and pressure it will produce.
When it comes to planning your irrigation, plant and row spacing is just as important as any other variable. The row direction can change an irrigation design significantly. So, deciding on the layout of the orchard or field is crutial before starting irrigation planning.
Initial estimates of the required water for irrigation can be calculated using acreage or number of trees. If you know at least one of the two you can calculate the other with tree spacing.
43560 sq. ft. per acre/50ft/30ft = 29 trees per acre
A small amount of sand being constantly pumped into an irrigation system can soon lead to big problems, especially with the small emitters in a drip system. It's very important to know up front what your water quality is like and what you need to do to properly filter your water for your irrigation system, since water quality can vary from well to well and irrigation system requirements also vary.