Actual Rain Sensor Dry Out Times Compared to …...Actual rain sensor dry out times compared to...

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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

Rain Sensor (RS)

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

Timer

Presenter
Presentation Notes
Irrigation is controlled by a timer

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

Presenter
Presentation Notes
Dry out after rain stops Under local weather conditions

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

MATERIALS AND METHODSLocation: On campus, UF,

Gainesville, FL

Data collection period:Jan 1 – Dec 31, 2007

Hunter RainClik

Receivers

MUX

Datalogger

Emitters

Receivers

MUX

Datalogger

Toro TWRS

Weather Station

Tipping bucket

Data logger

(0.25 mm)

(m/d h:m:s)

Weather Station

Weather data

Software Ref ET

WAVE to simulate hourly soil water balance

Clay Loam

Loam

Sand

WAVE to simulate hourly soil water balance

RESULTS AND DISCUSSION

Standard error bars

Presenter
Presentation Notes
Brands are not SD Winter is SD from Spring No interaction b2 Season/ brand <24 hrs

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

Standard error bars

Presenter
Presentation Notes
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

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Presenter
Presentation Notes
This is a very common situation in Florida Why is this?

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

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

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

Presenter
Presentation Notes
Brands are not SD Winter is SD from Spring No interaction b2 Season/ brand

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)

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

Common

WaterValve

Timer

Hot

Common

WaterValve

Timer

Hot

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