Recently I have been conducting sprinkler system assessmentso around my city. It is common to measure operating pressures of 80 to 100 psi at rotors and pop-up sprays. Optimum pressure for sprays is 30 psi, 45 psi for rotating spray nozzles and 45 to 50 psi for gear drive rotors. Gallons per minute at 98 psi can use 45 percent or more gallons per minute than at 30 psi. Solutions are to install a pressure reducing valve for the whole system, retrofit sprays and rotors with pressure regulated heads, or install a pressure regulator at the valve (like Hunter AccuSync). Control pressure and you will be amazed at the irrigation efficiency improvement. No more misting and less runoff.