High angle impact sprinklers may have two problems that reduce application efficiency -- the operating pressure is typically in the high range (>80 psi) and the angle of spray throws the water high into the air. With high pressure nozzles many of the water droplets are small leading to wind drift, direct evaporation of droplets into air, and loss of water from droplets during settling. With high throw angles, droplets spend more time in the air and thus have more time for those water losses from droplets.