Evapotranspiration: Simple ET Process
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Simple ET
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The process by which
water is transferred from
the soil to the
atmosphere by
Evaporation and by
Transpiration from
plants.
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T
Simple ET automatically adjusts individual stations each
day according to the weather.
Simple ET is easy; identify a Global Weather Source for the
controller and Base Run-time for each station
Base Run-time should be chosen to properly irrigate
during the highest-average ET month of the year at the
controller’s location (
Hot ≠ Humidity
)
IQ4 will gather ET value daily and automatically adjust the
station Run-times
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Example:
•
Highest monthly-
average ET for
Site from the
weather source
is
0.35” that day
•
The user inputs
15 minutes
as a
base runtime
•
IQ4 aligns these
two parameters
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Example:
•
The weather
source reports ET
of
0.25” that day
•
IQ4 adjusts the
run-time to
10.7 minutes
•
IQ4 will perform
this adjustment
for all days set to
run
Note: (current ET / highest monthly-average ET) * base run-time = (0.25 / 0.35) * 15 = 10.714 minutes
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T
Example:
•
The weather
source reports ET
0.09” that day
•
IQ4 adjusts the
run-time to
3.9 minutes
•
IQ4 will perform
this adjustment
for all days set to
run
Note: (current ET / highest monthly-average ET) * base run-time = (0.09 / 0.35) * 15 = 3.857 minutes
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T
Only days selected to
run, IQ4 will add the
missed day’s ET and
adjust the runtime to
cover those missed days
Example:
•
Water days are set
for a 3-day cycle
•
The ET each day is
0.13” per day
•
IQ4 adds the 3 day’s
ET (3 X 0.13” =
0.39”
)
•
IQ4 adjusts the
runtime to
16.7 minutes
Note: (current ET / highest monthly-average ET) * base run-time = ( 0.39 / 0.35 ) * 15 = 16.714 minutes
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:
–
During periods of low ETs, adjust the water days
pattern to not water as often. This prevents shallow
watering
–
Use Group Programming to set station base runtimes
that are identical
–
Simple ET uses a single start time. You cannot set
multiple start times for your Simple ET-based
programs
–
Simple ET will provide a maximum of 300% of the
base runtime(s)
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•
Select Weather from the System Setup menu
•
Click on the Add (Orange circle with + sign)
•
Enter Weather Source information
•
Click Save
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Select a controller from the controller list
•
Click on Edit
•
Select the weather source in the controller
edit panel
•
Click Save
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Select a program from the program list
•
Click on Edit
•
Select Simple ET in the ET Adjust field
•
Click Save
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Return to the Controller page
•
Click on Programs - select a Program
•
Select one or more stations that have identical run times
•
Click Edit
•
Enter the Base Runtime - click on Save
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–
IQ4 gets the monthly average ET for each month of
the year from the weather source and uses the
highest one for its calculations.
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–
Simple ET does not change day cycles
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–
(current ET / highest monthly-average ET) * base run-
time
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None of these. The user determines the Base
Runtime centered on their experience, best
judgement, etc.
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?
–
Current soil moisture balance doesn’t “effect”
anything at all. You should get the moisture exactly
where you expect SimpleET to maintain it at the end
of each irrigation cycle by watering at the same start
time as planned for SimpleET. Switch to SimpleET
and applications should match plant needs based on
ET.
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–
IQ4 uses the Cycle and Soak time entered for each
station no matter what starts a station (manual
operations, automatic operations, etc.) It will use
Cycle and Soak with the one start time.
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–
Dry Run, will be in IQ4 by end of December 2019
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–
Adjust the base runtime
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?
–
Adjust the day cycle until the runtimes are high
enough for proper operation of the sprinkler type
–
Later IQ4 versions will have more advance ET
capabilities
IQ4 is the next generation of commercial central control product. Any irrigation systems controlled by ESP-LX controllers can now be fully accessed from any device with web browsing capability through IQ4. IQ4 is a web browser based application that does not require any program installation. IQ4 is next generation of IQ product that is designed for enhanced use interface through streamlined navigation.
Evapotranspiration (ET) is the process of water transfer from soil to the atmosphere via evaporation and plant transpiration. Simple ET automatically adjusts watering based on weather conditions, ensuring efficient irrigation. By aligning ET values with base run-times, it optimizes watering schedules for maximum effectiveness.
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Presentation Transcript
Evapotranspiration (ET) Defined EvapoTranspiration The process by which water is transferred from the soil to the atmosphere by Evaporation and by Transpiration from plants.
Simple ET Simple ET automatically adjusts individual stations each day according to the weather. Simple ET is easy; identify a Global Weather Source for the controller and Base Run-time for each station Base Run-time should be chosen to properly irrigate during the highest-average ET month of the year at the controller s location (Hot Humidity) IQ4 will gather ET value daily and automatically adjust the station Run-times
Simple ET Example: Highest monthly- average ET for Site from the weather source is 0.35 that day The user inputs 15 minutes as a base runtime IQ4 aligns these two parameters
Simple ET Example: The weather source reports ET of 0.25 that day IQ4 adjusts the run-time to 10.7 minutes IQ4 will perform this adjustment for all days set to run User-Defined Base Runtime Note: (current ET / highest monthly-average ET) * base run-time = (0.25 / 0.35) * 15 = 10.714 minutes
Simple ET Example: The weather source reports ET 0.09 that day IQ4 adjusts the run-time to 3.9 minutes IQ4 will perform this adjustment for all days set to run Note: (current ET / highest monthly-average ET) * base run-time = (0.09 / 0.35) * 15 = 3.857 minutes
Simple ET Only days selected to run, IQ4 will add the missed day s ET and adjust the runtime to cover those missed days Example: Water days are set for a 3-day cycle The ET each day is 0.13 per day IQ4 adds the 3 day s ET (3 X 0.13 = 0.39 ) IQ4 adjusts the runtime to 16.7 minutes Note: (current ET / highest monthly-average ET) * base run-time = ( 0.39 / 0.35 ) * 15 = 16.714 minutes
Simple ET Best Practices: During periods of low ETs, adjust the water days pattern to not water as often. This prevents shallow watering Use Group Programming to set station base runtimes that are identical Simple ET uses a single start time. You cannot set multiple start times for your Simple ET-based programs Simple ET will provide a maximum of 300% of the base runtime(s)
Simple ET Setup Select Weather from the System Setup menu Click on the Add (Orange circle with + sign) Enter Weather Source information Click Save
Simple ET Setup Select a controller from the controller list Click on Edit Select the weather source in the controller edit panel Click Save
Simple ET Setup Select a program from the program list Click on Edit Select Simple ET in the ET Adjust field Click Save
Simple ET Setup Return to the Controller page Click on Programs - select a Program Select one or more stations that have identical run times Click Edit Enter the Base Runtime - click on Save
FAQs How does IQ4 know what Global Weather will use for the highest ET to know if my station run times are correct? IQ4 gets the monthly average ET for each month of the year from the weather source and uses the highest one for its calculations. How does IQ4 select the program day cycle that matches my peak station run times? Simple ET does not change day cycles
FAQs How does IQ4 calculate the station run times? What is the formula? (current ET / highest monthly-average ET) * base run- time What factors are included in the station run time calculation? Precipitation Rate, Distribution Uniformity, Landscape Coefficient, Program Day Cycle, other? None of these. The user determines the Base Runtime centered on their experience, best judgement, etc.
FAQs How does current soil moisture balance effect how/when the program first runs? Should I water heavily or dry the site out prior to converting to IQ4 Simple ET? Current soil moisture balance doesn t effect anything at all. You should get the moisture exactly where you expect SimpleET to maintain it at the end of each irrigation cycle by watering at the same start time as planned for SimpleET. Switch to SimpleET and applications should match plant needs based on ET.
FAQs How does IQ4 calculate station Cycle+Soak times to prevent puddling and run off with the single program start time? IQ4 uses the Cycle and Soak time entered for each station no matter what starts a station (manual operations, automatic operations, etc.) It will use Cycle and Soak with the one start time. How do I see what my programs are going to do (program end time, estimated total water use, other)? Dry Run, will be in IQ4 by end of December 2019
FAQs How do I find tune station run times that are under or over watering? Adjust the base runtime How do I calculate the program day cycle required for different times of the year/ETs? Adjust the day cycle until the runtimes are high enough for proper operation of the sprinkler type Later IQ4 versions will have more advance ET capabilities
