The selecting of sprinklers will depend upon the shape and areas to be watered and the amount of PSI and GPM available. A good place to start is by locating impulse or gear drive sprinklers for large areas (25' X 25' or larger) and spray heads and rotors for smaller areas. SPACING SPRINKLER HEADS To properly position your sprinkler at the best location on the graph paper, it is suggested that you use a compass to draw the sprinkler radius shown in the performance chart. Spacing of sprinkler heads should be no more than 45 feet apart for impulse heads or gear drives and 12 feet for spray heads. When these spacing are followed, you will find that 100% overlap is achieved, which is essential for perfect watering and elimination of any dry spots. At this point in your design plan, you should have identified all areas to be watered, selected all types of heads needed based on spray patterns and (GPM's) established the proper positioning and spacing for all heads. This information must be completed before proceeding to the next step. |