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Actual rain sensor dry out times compared to estimated ... · Actual rain sensor dry out times...
Transcript of Actual rain sensor dry out times compared to estimated ... · Actual rain sensor dry out times...
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Actual rain sensor dry out times
compared to
estimated soil dry out times
Bernardo Cárdenas and Michael D. Dukes
Agricultural and Biological Engineering Dept.,
University of Florida
Irrigation Show and Education
ConferenceLong Beach, CA
December 4, 2018
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Rain Sensor (RS)
•RS can bypass the timersettings, when therehas been sufficient rain.
Timer
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Expanding Disks
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Wireless RainClick
Expanding Disks
Antenna
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Common
WaterValve
Timer
Hot
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Common
WaterValve
Timer
Hot
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Question
Do the RS dry out periods match the soil dry outperiods?
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OBJECTIVES
a) Determine the dry out periods of 2 RSs
b) Estimate the dry out periods of 3 soil texturesthrough a soil water balance model
c) Compare a) vs b)
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MATERIALS AND METHODS
Location: On campus, UF,Gainesville, FL
Data collection period:
Jan 1 – Dec 31, 2007
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Hunter RainClik
Receivers
MUX
Datalogger
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Emitters
Receivers
MUX
Datalogger
Toro TWRS
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Weather Station
Tipping bucket
Data logger
(0.25 mm)
(m/d h:m:s)
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Weather Station
Weather data
Software Ref ET
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WAVE to simulate hourly soil water balance
Clay Loam
Loam
Sand
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WAVE to simulate hourly soil water balance
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RESULTS AND DISCUSSION
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Standard error bars
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Standard error bars
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Time Rain
(hh:mm) (mm)
18:00 1.5
19:00 0.3
20:00 0.3
21:00 1.3
22:00 1.3
23:00 1.3
Total 5.8
No runoff
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Infiltration = 27%
Infiltration = 39%
Infiltration = 100%
Time Rain
(hh:mm) (mm)
11:00 14.2
12:00 0.3
13:00
14:00 7.9
15:00
16:00
17:00 14.7
Total 37.1
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Standard error bars
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CONCLUSIONS
• The dry out periods of the tested RSs were shorterthan those of the different soil types modeled
• RSs: limited usefulness under Florida conditions
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