Rotary Sprinklers – uniform application over entire area – lawns
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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

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Spray heads
Spray Heads – lawns

Technical Information – operating pressure, flow, radius of throw, and nozzle options

  • Fixed head

  • Rotary Motor-driven

  • Rotary Impact

  • Bubbles


Sprinkler irrigation
Sprinkler Irrigation – lawns

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
Technical Information – lawns

  • 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 Rate Curve (often abbreviated as DRC)) 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
Sprinkler layout Rate Curve (often abbreviated as DRC)

  • Define Boundary

  • Select Spacing Pattern

  • Wind speed

  • Design coefficient

  • Select Sprinkler Head

  • Spacing based on nozzle and pressure

  • Precipitation rate

  • Time of application P t = depth needed


Head-to-head, Rate Curve (often abbreviated as DRC)


Spacing

S less than or equal to k D = k 2 r Rate Curve (often abbreviated as DRC)

k is a constant depending on spacing and wind speed

Spacing


Precipitation rates
Precipitation Rates Rate Curve (often abbreviated as DRC)

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


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