1 / 31

Drip Irrigation System Layout & Design

Drip Irrigation System Layout & Design. ADVANTAGES. Water savings Crop response Labour savings Fertilizer savings Less weed growth. Drip Irrigation System Layout & Design. ADVANTAGES. Saving in pesticides Possible use of saline water Early maturation

Download Presentation

Drip Irrigation System Layout & Design

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Drip Irrigation System Layout & Design

  2. ADVANTAGES • Water savings • Crop response • Labour savings • Fertilizer savings • Less weed growth Drip Irrigation System Layout & Design

  3. ADVANTAGES • Saving in pesticides • Possible use of saline water • Early maturation • Minimum soil crusting • Field edge loss reduction Drip Irrigation System Layout & Design

  4. ADVANTAGES • Improved root penetration • Irrigation of low intake soils • Easy field operation Drip Irrigation System Layout & Design

  5. LIMITATIONS • Sensitivity to clogging • Salinity hazards • Moisture distribution problems • High initial cost • Dry soil & dust formation Drip Irrigation System Layout & Design

  6. LIMITATIONS • High skill required for • Design • Installation • Operation • Maintenance Drip Irrigation System Layout & Design

  7. SYSTEM COMPONENTS DISCHARGE ELEMENTS (EMITTERS) • Selection criteria • General suitability • Pressure flow characteristics • Manufacturing variability Drip Irrigation System Layout & Design

  8. SYSTEM COMPONENTS • Sensitivity to temperature • Resistance to clogging • Cost • Risk Drip Irrigation System Layout & Design

  9. SYSTEM COMPONENTS Types - Orifice emitter q = C A - Tube emitter q = 0.034 h.78 - Labyrinth emitter q = 0.125 h.78 Drip Irrigation System Layout & Design

  10. SYSTEM COMPONENTS (Contd.) • Lateral lines • Sub – mains • Main lines • Mani – folds • Filters Drip Irrigation System Layout & Design SYSTEM COMPONENTS

  11. PROBLEMS IN FILTRATION • Physical contamination • Chemical contamination • Effect of water source • Fitness of filtration Drip Irrigation System Layout & Design

  12. FILTERING EQUIPMENT & METHODS • Pressure regulators • Control valves • Misc. fittings Drip Irrigation System Layout & Design

  13. DESIGN Amount of water to apply q = C U . A. σc qm = Where : qm is av. Emitter discharge in lph H is total hr. of operation/day N is nos. of emitters/ plant q = C U . SI . Sm. σc Drip Irrigation System Layout & Design

  14. DESIGN • Spacing of emitters Radius of coverage R = Max. spacing Sl X Sm Drip Irrigation System Layout & Design

  15. DESIGN • Uniformity of water distribution Flow variation < 20% Pressure variation < 20% Drip Irrigation System Layout & Design

  16. DESIGN • Lateral & mainlines Hazen William iq. H = 15.25 X L H = 5.35 (In decreasing flow lines) Drip Irrigation System Layout & Design

  17. DESIGN CHARTS • Lateral for uniform slopes • Lateral for non-uniform slopes • Sub-main • Main Drip Irrigation System Layout & Design

  18. Example 1 GIVEN : L = 50 m H = 10 m S = 1% Emitter spacing = 0.3 m q = 4 lph / emitter Drip Irrigation System Layout & Design

  19. Example 1 FIND: Lateral dia. L/H = 5 Q = 4 X 150 = 600 lph = 0.167 lps FIG. 6 (a) 12 mm is acceptable Drip Irrigation System Layout & Design

  20. Example 2 GIVEN: L = 120 m Dia = 16 mm H = 10 m Q = 0.13 lps Drip Irrigation System Layout & Design

  21. Example 2 SLOPE: 0 – 30 3% down 30 – 60 2% down 60 – 90 0% 90 – 120 3% down Drip Irrigation System Layout & Design

  22. Example 2 SOLUTION: I/L HI (m) HI/ L 0.25 0.9 0.0075 0.5 1.5 0.0125 0.75 1.5 0.0125 1 2.4 0.02 Drip Irrigation System Layout & Design

  23. Example 2 Plot I/L vs. HI/ L OHP 12 H = 5.35 X L = Drip Irrigation System Layout & Design

  24. Example 2 = 1.5 m = = .15 L/H = 120/10 = 12 Drip Irrigation System Layout & Design

  25. Example 2 Check pressure variation at 4 points at I/L 0.25, 0.5, 0.75, 1. Fig 8 Variations are (QD III) Less than 10% Drip Irrigation System Layout & Design

  26. Example 3 GIVEN: A= 20 ha Fig 11 Subplot = 0.4 ha Q = 2 lps / subplot Drip Irrigation System Layout & Design

  27. Example 3 Fig 12, Plot mainline profile Plot reqd. pressure head Plot energy line Use Fig 10 OHP 14 with S = 1 % Find dia of mainline Table 5 Drip Irrigation System Layout & Design

More Related