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Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University of Florida 2018 Urban Landscape Summit Gainesville, FL March 14, 2018
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Page 1: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Actual rain sensor dry out times compared to

estimated soil dry out times

Bernard Cardenas and Michael D. DukesABE Dept., University of Florida

2018 Urban Landscape Summit Gainesville, FL March 14, 2018

Page 2: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Rain Sensor (RS)

•RS can bypass the timersettings, when therehas been sufficient rain.

Timer

Presenter
Presentation Notes
Irrigation is controlled by a timer
Page 3: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

QuestionDo the RS dry out periods match the soil dry outperiods?

Presenter
Presentation Notes
Dry out after rain stops Under local weather conditions
Page 4: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

OBJECTIVESa) Determine the dry out periods of 2 RSsb) Estimate the dry out periods of 3 soil textures

through a soil water balance modelc) Compare a) vs b)

Presenter
Presentation Notes
Dry out after rain stops Under local weather conditions
Page 5: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

MATERIALS AND METHODSLocation: On campus, UF,

Gainesville, FL

Data collection period:Jan 1 – Dec 31, 2007

Page 6: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Hunter RainClik

Receivers

MUX

Datalogger

Page 7: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Emitters

Receivers

MUX

Datalogger

Toro TWRS

Page 8: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Weather Station

Tipping bucket

Data logger

(0.25 mm)

(m/d h:m:s)

Page 9: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Weather Station

Weather data

Software Ref ET

Page 10: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

WAVE to simulate hourly soil water balance

Clay Loam

Loam

Sand

Page 11: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

WAVE to simulate hourly soil water balance

Page 12: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

RESULTS AND DISCUSSION

Page 13: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Standard error bars

Presenter
Presentation Notes
Brands are not SD Winter is SD from Spring No interaction b2 Season/ brand <24 hrs
Page 14: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Standard error bars

Presenter
Presentation Notes
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
Page 15: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Standard error bars

Presenter
Presentation Notes
RS are SD from Soil Type: Always!
Page 16: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

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

Page 17: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

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Page 18: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

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Page 20: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University
Presenter
Presentation Notes
This is a very common situation in Florida Why is this?
Page 21: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

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

No runoff

Page 22: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Infiltration = 27%

Infiltration = 39%

Infiltration = 100%

Time Rain(hh:mm) (mm)

11:00 14.212:00 0.313:0014:00 7.915:0016:0017:00 14.7Total 37.1

Page 23: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

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

Page 24: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University
Presenter
Presentation Notes
Brands are not SD Winter is SD from Spring No interaction b2 Season/ brand
Page 25: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Expanding Disks

Presenter
Presentation Notes
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)
Page 26: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Wireless RainClick

Expanding Disks

Antenna

Presenter
Presentation Notes
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
Page 27: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Common

WaterValve

Timer

Hot

Page 28: Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to estimated soil dry out times Bernard Cardenas and Michael D. Dukes ABE Dept., University

Common

WaterValve

Timer

Hot


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