1. DASAR -DASAR IRIGASI S SPRINGKEL PS TEKNIK SUMBERDAYA ALAM DAN LINGKUNGAN BAMBANG RAHADI

2. On-Farm Irrigation Methods Presentation 4 – Sprinkle Irrigation Systems On-Farm Irrigation Methods TypeU.S. AreaWorld Area Surface65%95% Sprinkler30%3% Micro Irrigation3%1% Sub-Irrigation2%1%

3. Keuntungan 1.High Application uniformity 2.Use of small continuous streams 3.Use on steep or undulating topographies 4.Application of light & frequent irrigations 5.Labor is only needed for a short time each day 6.Labor can be relatively unskilled 7.Automation is readily available 8.Weather (micro-climate) can be modified

4. Kerugian 1.Initial costs are high ($500 to $3,500 per ha) 2.Operating costs are high 3.Water quality can be a problem 4.Wet conditions during crop maturation can impact yield 5.Fluctuating flow rates at the water source 6.Irregular field shapes are difficult to irrigate 7.Very windy or very dry conditions result in high losses 8.Low intake rate soils (< 3 mm/hr) have runoff problems

5. “Set” Systems  Fixed  Periodic-move Continuous-move Systems

6. “Set” Systems Hand-move End-tow Side roll (“wheel lines”) Gun Boom Fixed (“solid set”) Others

7. Hand-move Sprinkle Systems

8. End-tow Sprinkle Systems

9. Side Roll Sprinkle Systems

10. Gun Sprinkle Systems

11. Boom Sprinkle Systems

12. Solid Set Sprinkle Systems

13. Special Sprinkle Systems

14. Continuous- Move Systems Center Pivots

15. Liner-move Sprinkle Systems

16. Miscellaneous Moving Sprinkle Systems

17. Field Evaluation of Sprinkle Systems – Pressure Impacts Pressure is the most important operational parameter in sprinkle irrigation.

18. Field Evaluation of Sprinkle Systems – Precipitation Patterns

19. EVALUASI Catch-can tests are for evaluating uniformity Catch-can data are often overlapped for various sprinkler & lateral spacings Use a program for overlapping: CATCH-3D You can also use a spreadsheet program to simulate overlapping

20. Field Evaluation of Sprinklers Catch-can tests represent a specific wind & pressure situation Typical catch-can spacings are 2 or 3 m on a square grid, or 1 to 2 m spacings along one or more “radial legs” Set up cans with half spacing from sprinklers (in both axes) to facilitate overlapping See ASAE S398.1 and ASAE S436

21. The End