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Sprinkler Selection (2)
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Sprinkler Selection (2)

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  • 1. Sprinkler Selection
  • 2. Sprinkler Selection
    • Spray
      • Pop-up
      • Shrub spray
    • Rotating
      • Impulse or Impact
      • Pop-up Gear driven
    • Bubblers and drip irrigation
  • 3. Considerations
    • Goal – select the type that will cover the area properly using the least number of sprinklers
    • Windy – low angle
    • Arid climate – higher flow or multiple irrigation cycles
    • Slopes
    • Soil
  • 4. Precipitation Rate
    • Don’t mix on one valve circuit
    • Matched Precipitation Rate Sprinklers (MPR)
    • See Rainbird Catalog 18-22 MPR Series
    • (Stryker) Look for this feature
  • 5. Spray Heads
    • For smaller areas
    • For areas with enclosed borders
    • Require tightly controlled spray
    • Dense tree growth that would get in the way of rotor spray
    • Mixed plantings needing different amounts of water
  • 6. Spray Heads
    • Fixed spray heads
    • Fan shaped pattern of water
    • Spaced up to 18 feet apart
    • Need between 20 and 30 PSI to operate properly
  • 7. Typical (Standard) Spray Patterns
  • 8. GPM Calculation for reduction of Spray heads
    • Use the chart
    • Actually just reducing the pressure
      • Example:
    Modified 1.65 GPM 14 ft 25 PSI Original 1.85 GPM 15 ft 30 PSI
  • 9. Other Spray Patterns
    • Specialty Strips
      • Center
      • Side
      • End
    • Variable Arc Nozzle
      • For occasional odd shaped, in between areas
      • From 0 o to 360 0
    • Stream Spray - fingers of water
  • 10. Stream vs Fan Sprays slopes, tight fine grain soils PR - 1-4 in/hour PR - 1/3 – 1 1/2in/hour 5-18 feet 5-22 feet (small areas) 20-30 PSI 15-30 PSI (low) Fan Stream
  • 11. Rotors
    • Rotating streams of water
    • Impact rotors – fire bursts of water
    • Gear Driven rotors
      • very quiet
      • lower maintenance
      • smaller in size
    • Multi-stream rotors – expensive, much higher maintenance
  • 12. Rotors
    • Spacing – 18 – 55 feet apart
    • 5 – 100 gpm
    • PR – ¼ - 2 in/hour
    • Require more water pressure to operate than spray heads
    • (Stryker) water pressure at the head must exceed the distance between heads
      • If you want 35 feet apart, be sure 35 PSI
  • 13. Rotors - warning
    • (Stryker) Don’t rely on manufacturers’ radius on charts
    • If less than 6 GPM, maximum spacing should never be more than 35’ between sprinklers
    • (Stryker) They don’t test with wind
  • 14. Rotor selection
    • Select the appropriate Nozzle size for each rotor to match the precipitation rates
    • The rotation speed is the same regardless of whether the rotor is adjusted to a full circle or a quarter circle
    • If a quarter circle, passing over the same area 4 times in the same amount of time as 1 full circle
  • 15. Rotor Precipitation Rates
    • If the nozzle is the same the quarter circle will put down 4 times as much water on the area as a full circle
    • To match: change the nozzle to cut the amount of water to ¼
    • Half circle – nozzle with ½ amount of the water of a full circle, etc.
    • See Rainbird catalog pg. 74 & 75
  • 16. Rotor adjustment
    • If you adjust the radius you need to adjust the nozzle too
    • (Stryker) Don’t use rotors with nozzle flows less than 2.5 GPM except in corners (1/4 circle)
  • 17. GPM Calculation for reduction of Rotor heads
    • GPM stays the same
      • Doesn’t change the amount of the water coming out of the nozzle
      • Use the pin to reduce the radius
      • Uneven water, dry spots
      • Should be reducing the GPM too, but you don’t
    • Only use the radius adjustment screw on rotors when nothing else will work
  • 18. Stryker’s Cheat Chart – Rotors 20-29’ Spacing 3.2 GPM 30 PSI Full Circle 2.4 GPM 30 PSI ¾ circle 1.6 GPM 30 PSI ½ circle .8 GPM 30 PSI ¼ circle
  • 19. Stryker’s Cheat Chart – Rotors 30-39’ Spacing 6.0 GPM 40 PSI Full Circle 4.5 GPM 40 PSI ¾ circle 3.0 GPM 40 PSI ½ circle 1.5 GPM 40 PSI ¼ circle
  • 20. Stryker’s Cheat Chart – Rotors 40-55’ Spacing 11.0 GPM 55 PSI Full Circle 8.0 GPM 55 PSI ¾ circle 5.5 GPM 55 PSI ½ circle 3.0 GPM 55 PSI ¼ circle
  • 21. How to decide Irrigation Water City Water Need 40 PSI minimum Lower PSI Costs more per sprinkler Less per sprinkler Less trenching More sprinklers, more trenching 18-55 feet apart Up to 18 feet apart Rotor Spray
  • 22. Body Styles
    • Pop-up
      • Installed below ground
      • Available 3”, 4”, 6” 12” above ground
        • Need to clear the lawn height
    • Shrub style
      • On a ‘riser’
      • Use away from traffic patterns
    • Cost the same
  • 23.  
  • 24. Metal or Plastic
    • Metal is more durable
    • Until 1970’s, metal was preferred material
    • Now plastic is the most common
    • Metal too expensive
    • Some have a brass fitting
    • (Stryker) not much difference today
  • 25. What to look for
    • Spring retraction
      • Use a spring to pull the pop-up riser down into the case
      • Stay away from gravity retraction
    • Wiper Seal – soft plastic seal around the pop-up riser stem that seals the riser wo it won’t leak
      • Keeps the dirt out
    • 3” pop-up height or higher
      • Most pros use 4” in lawn areas and 6”-12” in shrub areas
  • 26.  
  • 27. Pressure Requirements
    • Spray Type
      • (Stryker) When designing, use 30 PSI unless you know that it is lower
      • If the pressure is lower, place sprinklers closer together
    • Rotor Type
      • Won’t work well with less than 30 PSI
    • Drip Emitters
      • Usually best at around 20 PSI
  • 28. Mix and Match
    • Don’t mix and match on the same valve
    • Special valve to reduce the pressure for the lower pressure sprinklers
    • Design for the high pressure
  • 29. Trajectory of Water
    • As water comes out of the sprinkler head, it travels in a curved path through the air to the ground.. Trajectories of spray include:
    • 0 degree trajectory -- this flat spray can be used for throwing water under low shrubs
    • 10 degree trajectory -- this low angle spray can be used in a high wind situation and for shrub and groundcover beds
    • 22-26 degree of trajectory -- this is the standard trajectory thrown by most sprinklers
    • 30-35 degree trajectory -- this is a special trajectory used for throwing water over plant material such as groundcovers and gardens