The simplest and least costly sprinkler systems are the hand carry or hand move types that require labor input for setting up and moving the system. Although some labor input is required, these systems are applicable because of their relatively low cost. Stationary big gun. This system includes a pump and main line similar to the hand carry system, but with a single large-volume gun sprinkler replacing hand move sprinklers. Advantages of the big gun system include larger flow rates and a larger wetted area so less labor is required in moving the sprinkler.
Some big guns are wheel-mounted to facilitate moving the unit.
Stationary big guns typically have nozzle sizes ranging from 1 to 2 inches and operate best at pressures of 80 to 120 pounds per square inch. Coverage areas from 2.5 to 6.0 acres can be obtained with proper selection of nozzle size and operating pressure. Although stationary big guns cost more than smaller hand-carry systems, the reduced labor and higher flow rates may offset the higher cost. The sprinkler systems already described require labor for movement from one set or location to another to ensure that the soil does not become saturated. This self-propelled unit covers larger areas than stationary sprinklers of the same size.