Rotary Sprinklers – uniform application over entire area – lawns

Micro sprays – Water uniformly over small areas

Drip – Trickle – specific area – shrubs

Spray Heads Technical Information – operating pressure, flow, radius of throw, and nozzle options Fixed head Rotary Motor-driven Rotary Impact Bubbles

Sprinkler Irrigation Uniform application by overlapping non-uniform wetting paterns Sprinkler spray heads – no moving parts - small area – pop up Microsprays – overhead – small area Rotary Sprinklers – Impact or gear driven

Technical Information Nozzle - removable – controls velocity and flow Operating Pressure – inc pressure – inc water flow and change wetting pattern Radius of Throw – furthest point Water Distribution Patterns Trajectory – angle

When a sprinkler is tested to determine its Distribution Rate Curve (often abbreviated as DRC) One measure used to compare DRCs is the scheduling coefficient or SC.

Scheduling Coefficient (SC) is the average depth of water in the catch cans divided by the depth of water in the catch can having the least amount of water. Interpolation

Sprinkler layout 1.Define Boundary 2.Select Spacing Pattern 3.Wind speed 4.Design coefficient 5.Select Sprinkler Head 6.Spacing based on nozzle and pressure 7.Precipitation rate 8.Time of application P t = depth needed

Head-to-head,

Spacing Table 1, Values of k s Wind SpeedTriangularSquare 0-3 mph mph mph S less than or equal to k D = k 2 r k is a constant depending on spacing and wind speed

Precipitation Rates P = q/A Units MUST be consistent. For: P = precipitation rate (in/hr) q = flow onto area (gal/min) A = area (ft²) P = 96.3 q/A