Watering devices, such as irrigation heads or sprinklers, often are misaligned with the area they are intended to water. Consequently, water is wasted on paved areas and structures. Sometimes, the wrong wetting pattern is set and should be corrected. For example, if a 360 degree wetting pattern is on an irrigation head next to a paved area, then half of the water released is wasted. In this case, the cap should be unscrewed and replaced with a 180 degree wetting pattern.
Impact sprinklers have moveable clips which restrict the degree of rotation.
Additionally, some new impact heads allow you to adjust the length of the water stream by setting the screw on the spoon. Adjustment to gear sprinklers should be done by following the manufacturers directions. If instructions did not come with the system, they may be obtained at an irrigation supply store. Since gear sprinklers are more complicated devices, you may want to consult an irrigation specialist for adjustment. Begin repairs by removing enough ground around the head to allow access to the break.