Sprinkler Spacing

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Sprinkler Spacing

  1. 1. Sprinkler Spacing <ul><li>Area watered by each sprinkler must overlap </li></ul><ul><li>They are designed to require 100% overlap of watered areas </li></ul><ul><li>The Sprinkler radius = the distance between sprinklers </li></ul>
  2. 3. Exceptions <ul><li>A few can be slightly farther apart to work around odd shaped areas </li></ul><ul><li>At least 80% should be head-to head </li></ul><ul><li>To get the absolute maximum </li></ul><ul><ul><li>Diameter (radius x 2) times 60% </li></ul></ul><ul><ul><li>15’ radius x 2 x .6 = 18 feet maximum </li></ul></ul><ul><li>If in a windy spot spaced at 45% diameter </li></ul><ul><li>Anything over 10mph cause trouble </li></ul>
  3. 4. Where is the water falling?
  4. 5. Smaller radius <ul><li>Usually a radius adjustment device </li></ul><ul><li>Don’t go lower than 50% </li></ul><ul><li>Don’t forget to reduce the distance between heads </li></ul>
  5. 6. Uniformity of spacing <ul><li>Keep the distance as uniform as possible between heads </li></ul><ul><li>Form an equilateral triangle if possible </li></ul><ul><li>This creates more even water coverage than a square </li></ul><ul><li>Changes in spacing should be made a gradually as possible </li></ul>
  6. 7. Patterns <ul><li>Square </li></ul><ul><li>Triangular </li></ul><ul><li>Rectangle </li></ul>
  7. 9. Square Pattern <ul><li>For square areas </li></ul><ul><li>Borders with 90 0 angles </li></ul><ul><li>Weakest for proper coverage </li></ul><ul><li>Problem is the diameter between the corners is larger than the radius </li></ul><ul><li>Rainbird recommends 55% spacing for 0 wind </li></ul>
  8. 10. Square Pattern in Wind <ul><li>Per Rainbird for square pattern </li></ul>45% diameter 8 – 12 mph 50% diameter 4 – 7 mph 55% diameter 0 – 3 mph Maximum spacing Wind velocities
  9. 11. Problem with square pattern
  10. 15. Triangular Pattern <ul><li>Used where area has irregular boundaries or borders that are open to over spray </li></ul><ul><li>Equilateral triangle pattern </li></ul>
  11. 16. Triangular Pattern <ul><li>Because the sprinklers are offset, the middle potential dry spot in a square pattern is eliminated </li></ul><ul><li>Usually can be spaced farther than with square pattern </li></ul><ul><li>Can mean less sprinklers, cost, time, maintenance over the life of the system </li></ul>
  12. 17. Square Pattern in Wind <ul><li>Per Rainbird for triangular pattern </li></ul>50% diameter 8 – 12 mph 55% diameter 4 – 7 mph 60% diameter 0 – 3 mph Maximum spacing Wind velocities
  13. 18. Rectangular Pattern <ul><li>For windy site conditions </li></ul><ul><li>Defined straight boundaries and corners </li></ul><ul><li>Pattern should be a 60% spacing </li></ul>
  14. 19. Square Pattern in Wind <ul><li>Per Rainbird for rectangular pattern </li></ul><ul><li>Measure S – Spacing (hypotenuse of a triangle) </li></ul><ul><li>Measure L – lateral (height of the triangle)S*.866 </li></ul>L=60% diameter S=40% of diameter 8 – 12 mph L=60% diameter S=45% of diameter 4 – 7 mph L=60% diameter S=50% of diameter 0 – 3 mph Maximum spacing Wind velocities
  15. 20. Steps <ul><li>Start drawing a sprinkler in each corner </li></ul><ul><li>Draw sprinklers around the perimeter of the irrigated area </li></ul><ul><li>Adjust to make the spacing between as even as possible </li></ul><ul><li>Then draw the interior area sprinklers </li></ul>
  16. 22. Wind Spacing
  17. 23. Over-water <ul><li>Can use radius adjustments to cut down the water if necessary </li></ul><ul><li>Easier to remove a sprinkler than to add one </li></ul>
  18. 24. Narrow Strips <ul><li>Standard spray types closer adjusted down to 6 feet don’t work very well </li></ul><ul><li>If long a narrow site, use strip pattern nozzles </li></ul><ul><li>Stryker – prefers ‘side strip’ rather than center strip </li></ul><ul><li>Stryker – End-strip nozzles have notoriously bad patterns. Don’t use them more than 10’ from the next head </li></ul>
  19. 25. Narrow Strips continued <ul><li>If using standard spray sprinklers (1/4, ½, full circle nozzles) and they must be adjusted less than 6 feet use PRESSURE COMPENSATING DEVICE to reduce the radius </li></ul><ul><li>The device goes under the nozzle </li></ul><ul><li>Have to pick the correct device for each nozzle </li></ul><ul><li>See Rainbird catalog pg.88 for 1800 PCS </li></ul>
  20. 26. Long and Narrow Example <ul><li>End strips and side strips </li></ul><ul><li>Spot on either side of end strips can be dry </li></ul><ul><li>Avoid using 2 end strips facing each other </li></ul><ul><li>Add a center strip between the 2 ends if possible </li></ul>
  21. 27. Narrow Strips wider than 5’ <ul><li>Use regular half circle heads on both sides </li></ul><ul><li>Make the heads not more than 1 foot sider than the width of the planter </li></ul><ul><li>ie. If the planter is 8’ wide make the sprinklers not more than 9’ apart </li></ul><ul><li>Best if arranged in a triangular pattern </li></ul>

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