SOP 14 Distribution uniformity evaluation for micro-sprinklers. Updated 7/28/14. Materials needed:
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1 SOP 1 Distribution uniformity evaluation for micro-sprinklers Updated 7/8/1 Materials needed: 1. GPS or measuring wheel. Clip board. Data sheet. Sharpie pen. 1 ft tape measure 6. Flags 7. 0, 0.-L water collection cups (flat bottom) 8. of each: 100 ml, 0 ml, and 00 ml graduated cylinders 9. funnels Schrader valves with barbs 11. Stop watch 1. Calibrated gauge with Schrader adapter Procedures: Description of field: 1. Measure longest and shortest row of field (irrigation block).. Determine width of field (irrigation block). Determine area of field (irrigation block). Determine between row spacing. Determine in row spacing of trees 6. Determine number of micro sprinklers per tree 7. Determine lateral (polyethylene hose) diameter 8. Determine manufactures discharge rate for microsprinkler head, microsprinkler head pattern (ex. 70 degrees), and if compensating 9. Map block to be evaluated and location of measurements Micro-sprinkler head flow rate, pattern uniformity, and evaluation (before irrigating): 1. Identify 6 areas to measure lateral line, micro-sprinkler flow rates, and sprinkler pattern uniformity (areas should represent different elevations and distances from water source [pump o r mainline] such as the head, middle, and lower end of irrigation block, as well as the middle and sides of the field ). Identify each evaluation area on map by codes A,B,C, etc. Estimate distances between the areas and a reference point (distance from submain and tree row number ). Place flags to identify evaluation area.. Record ing flow meter reading and time of the irrigation After the irrigation system is turned on and fully pressurized: 1. Measure flow rate of the system and time. SOP 1 DU evaluation for micro-sprinklers Page 1
2 . Measure discharge rate of sprinkler heads and of lateral lines in each area: a. Remove a micro sprinkler and install a barbed Schrader valve. b. Record ing with calibrated gauge. c. Place a micro-sprinkler in the 1 st collection cup and stop watch. d. After 0 seconds place the next micro-sprinkler into a collection cup. e. Repeat step d until micro sprinklers are measured. f. Remove the first micro sprinkler after 10 minutes. g. Remove the other 0 second intervals. h. Record ending with calibrated gauge. i. Measure volume of water in each collection cup and record cup number by area (A, B, C) and cup number.. Measure uniformity of micro sprinkler pattern in each area: a. Remove a micro sprinkler and install a barbed Schrader valve. b. Record ing with calibrated gauge. c. Place shallow collection cups at predetermined distances from the micro sprinkler (Figure 1). d. After 60 seconds place the next collection cups near another micro-sprinkler e. Repeat step d until micro sprinklers are evaluated. f. Remove the first group of cups after 10 minutes. g. Remove the other 60 second intervals. h. Record ending with calibrated gauge. i. Measure volume of water in each collection cup and record cup number by area (A, B, C), position, and cup number. Figure 1. Position of catch cans to evaluate micro-sprinkler pattern.. After all areas are evaluated: SOP 1 DU evaluation for micro-sprinklers Page
3 a. Remove Schrader valves and reconnect microsprinklers b. Remove all flags Calculations: 1. Calculate overall micro-sprinkler discharge rate (gal/minute/emitter). Calculate regional micro-sprinkler discharge rate (each area or groups of areas). Calculate field application rate (overall and regional) (inches/hour). Evaluate vs micro-sprinkler discharge rate. Calculate overall micro-sprinkler discharge rate DU lowest quarter for the irrigation block 6. Calculate regional micro-sprinkler discharge rate DU lowest quarter (group of at least 0 cups) 7. Calculate overall micro-sprinkler discharge rate 10% scheduling coefficient for the irrigation block 8. Calculate regional micro-sprinkler discharge rate 10% scheduling coefficient (group of at least 0 cups) 9. Calculate overall micro-sprinkler pattern CU for the irrigation block 10. Calculate regional micro-sprinkler pattern CU (group of at least 0 cups) Comments SOP 1 DU evaluation for micro-sprinklers Page
4 Grower Date Ranch Block crop and field dimensions crop/tree between row spacing (feet) In row tree spacing (feet) shortest row length (feet) longest row length (feet) irrigation block (field) width (feet) Irrigation block (field) area (acres) slope of field (%) number of sprinklers per tree microsprinkler discharge rate compensating sprinkler pattern (eg. 70 ) diameter of polyethylene hose SOP 1 DU evaluation for micro-sprinklers Page
5 Grower Ranch Date Block Area A Area B Area C collection volume (ml) cup A1 cup B1 cup C1 cup A cup B cup C cup A cup B cup C cup A cup B cup C cup A cup B cup C cup A6 cup B6 cup C6 cup A7 cup B7 cup C7 cup A8 cup B8 cup C8 cup A9 cup B9 cup C9 cup A10 cup B10 cup C10 cup A11 cup B11 cup C11 cup A1 cup B1 cup C1 Area D Area E Area F collection volume (ml) cup D1 cup E1 cup F1 cup D cup E cup F cup D cup E cup F cup D cup E cup F cup D cup E cup F cup D6 cup E6 cup F6 cup D7 cup E7 cup F7 cup D8 cup E8 cup F8 cup D9 cup E9 cup F9 cup D10 cup E10 cup F10 cup D11 cup E11 cup F11 cup D1 cup E1 cup F1 SOP 1 DU evaluation for micro-sprinklers Page
6 Grower Ranch Date Block Area A Area B Area C position collection volume (ml) sprinkler 1 1 sprinkler 1 sprinkler 1 sprinkler 1 sprinkler 1 SOP 1 DU evaluation for micro-sprinklers Page 6
7 Grower Ranch Date Block Area D Area E Area F position collection volume (ml) sprinkler 1 1 sprinkler 1 sprinkler 1 sprinkler 1 sprinkler 1 SOP 1 DU evaluation for micro-sprinklers Page 7
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