Actual rain sensor dry out times compared to estimated soil dry … · 2019-03-27 · Actual rain...
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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 Urban Landscape Summit Gainesville, FL March 21, 2019
Transcript of Actual rain sensor dry out times compared to estimated soil dry … · 2019-03-27 · Actual rain...
Actual rain sensor dry out times compared to
estimated soil dry out times
Bernardo Cárdenas and Michael D. DukesAgricultural and Biological Engineering Dept.,
University of Florida
Urban Landscape SummitGainesville, FLMarch 21, 2019
Presenter
Presentation Notes
This is a very common situation in Florida Why is this?
Rain Sensor (RS)
•RS can bypass the timersettings, when therehas been sufficient rain.
Timer
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Irrigation is controlled by a timer
Expanding Disks
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A: Hygroscopic disks absorb water and expand proportionally to rainfall amount. They activate a switch that interrupts the programmed irrigation cycle B: settings 1/8, ¼, ½, ¾, and 1 in. C: dry out: weather conditions and vent ring opening (completely opened)
OBJECTIVESa) Measure the dry out periods of 2 RSs
b) Estimate the dry out periods of 3 soil texturesthrough a soil water balance model (Wave)
c) Compare a) vs b)
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Dry out after rain stops Under local weather conditions
MATERIALS AND METHODSLocation: On campus, UF,
Gainesville, FL
Data collection period:Jan 1 – Dec 31, 2007
Hunter RainClik
Receivers
Datalogger
Sensors/Emitters
Sensors/Emitters
ReceiversDatalogger
Toro TWRS
Weather Station
Tipping bucket
Data logger
(0.25 mm)
(m/d h:m:s)
Weather Station
Weather data
Inputs to Wave
WAVE to simulate hourly soil water balance
Clay Loam
Loam
Sand
RESULTS AND DISCUSSION
Standard error bars
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RS are SD from Soil Type: Always!
CONCLUSIONS• The dry out periods of the tested RSs were shorter
than those of the different soil types modeled
• RSs: limited usefulness under Florida conditions
• An electronic mechanism that could delay thereturn of the RS to the allowing irrigation mode isrecommended
• This could greatly improve the functionality, watersaving potential, and acceptance of RSs
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Wireless RainClick
Expanding Disks
Antenna
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Sensor/transmitter and receiver/controller connected to the timer Vent ring: completely opened Advantages: quicker and easier installation, and additional mounting locations to choose from (up to 300 ft away from the receiver), especially for sites that present difficulty in routing wire as well as for retrofit applications Disadv: we will see
Common
WaterValve
Timer
Hot
Common
WaterValve
Timer
Hot
QuestionDo the RS dry out periods match the soil dry outperiods?
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Dry out after rain stops Under local weather conditions
WAVE to simulate hourly soil water balance
Time Rain(hh:mm) (mm)
18:00 1.519:00 0.320:00 0.321:00 1.322:00 1.323:00 1.3Total 5.8
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Brands are not SD Winter is SD from Spring No interaction b2 Season/ brand
Standard error bars
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Brands are not SD Winter is SD from Spring No interaction b2 Season/ brand <24 hrs
Standard error bars
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Dry out time: Max 168 h Seasons: Winter is SD from Summer Soil type: Sand is SD from L and CL CL tendency to dry out sooner than L Run Off
