I04 Audit Work S

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I04 Audit Work S

  1. 1. Colorado Master Gardener Training Colorado Garden Certificate Training Cooperative Extension Colorado State University #I-04, January 2003 Watering Efficiently Work Sheet 1. Run Time – For the precipitation rates, calculate the run time to apply the given amount of water. Amount of Water to Apply Zone Precipitation Rate Run Time (minutes) (Inches) 32 1 1 ½”/hour 0.8 inch 2 1 ¼”/ hour 0.6 inch 3 ½”/hour 1.0 inch 4 2” hour 0.8 inch 5 ¾”/hour 0.5 inch 6 1 ½”/hour 1.5 inch 2. Since pop-up heads have a precipitation rate of 1 to 2 ½ inches per hour and rotor heads have a precipitation rate of ¼ to ¾ inches per hour, what heads in question 1 were pop-ups? 3. Observational Method – Calculate the run time for each zone applying 0.7 inch per irrigation. Amount of Water to Apply Zone Precipitation Rate Run Time (minutes) (Inches) 34 1 1 ¼” /hour 0.7 inch 2 2 ¼” / hour 0.7 inch 3 3 /4” /hour 0.7 inch 4 1 ½”/hour 0.7 inch 5 2” /hour 0.7 inch 6 ½” /hour 0.7 inch
  2. 2. Historical ET Method 4. Precipitation rate of 1.5”/hour Watering once a week April* May June July Aug. Sept. Oct. Inches of water per 0.9” 1.2” 1.5” 1.5” 1.3” 1.0” 0.6” Zone week (Historical ET) Watering days Saturday Saturday Saturday Saturday Saturday Saturday Saturday Inches 0.9 Precipitation to apply 1 rate Run 1.5”/hr 36 time 5. Precipitation rate of 1.5”/hour Watering twice a week (Thursdays and Saturdays) April* May June July Aug. Sept. Oct. Inches of water per 0.9” 1.2” 1.5” 1.5” 1.3” 1.0” 0.6” Zone week (Historical ET) Thursday Thursday Thursday Thursday Thursday Thursday Thursday Watering days Saturday Saturday Saturday Saturday Saturday Saturday Saturday Inches 0.45 Precipitation to apply 1 rate Run 1.5”/hr 18 time 6. For the scenario in questions 4 and 5 above, if 1” is the maximum amount of water to apply per irrigation (for soil water holding capacity and rooting depth at the site) circle the better irrigation pattern (i.e., once a week or twice a week) for each month.
  3. 3. 7. Precipitation rate of 2”/hour Water twice a week (Thursday and Saturdays) Soak and cycle to prevent runoff on a slope at ~1/4 inch per cycle April* May June July Aug. Sept. Oct. Inches of water per week 0.9” 1.2” 1.5” 1.5” 1.3” 1.0” 0.6” Zone (Historical ET) Thursday Thursday Thursday Thursday Thursday Thursday Thursday Watering days Saturday Saturday Saturday Saturday Saturday Saturday Saturday Inches to 0.45 0.55 0.70 0.75 0.65 0.45 0.3 apply per irrigation Precipitation Total run 14 time 2 rate 2”/hr Number of 2 cycle Run time 7 per cycle 8. Based on soil water holding capacity and rooting depth, 1” per irrigation is the optimum to apply. Schedule is based on applying 1” per irrigation. April* May June July Aug. Sept. Oct. Inches of water per 0.9” 1.2” 1.5” 1.5” 1.3” 1.0” 0.6” Zone week (Historical ET) Inches of water per 0.13” 0.17” 0.20” 0.21” 0.18” 0.14” 0.09” day (Historical ET) Days between 1” 8 irrigation Inches 1” 1” 1” 1” 1” 1” 1” Precipitation to apply 3 rate Run 3/4”/hr 80 80 80 80 80 80 80 time

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