Following a little over three years of quiet research, the
UF-managed smart irrigation study based in Orange County recently enjoyed some
time in the spotlight. In July, Orange County Utilities (OCU), confident in the water
saving data documented during the project’s lifespan, revealed the next steps
for promoting water efficient technology to Central Florida.
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| Textbook installation of a stand-alone weather-based irrigation controller |
A Study Intro
The
smart irrigation technology study in Orange County is assessing the water
saving potential of two devices in real-world locations:
a) weather-based (ET) irrigation controllers
b) soil moisture sensors (SMS)
b) soil moisture sensors (SMS)
167 homes around the county participate in the research - outfitted
with one of these devices and a data-logging water meter. Treatments vary by
soil type (flatwood or sand) and whether or not UF personnel engaged the study
participant with educational material for using the device properly. A group of homes with time-based irrigation systems scattered among all the research areas is used as a
control.
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| Figure 1: water use among treatments and different soil types (courtesy OCU) |
The Good News
The study numbers are in (Figure 1) and the water savings are clear, with flatwood
soil homes showing less irrigation than sandy homes, and participants that engaged
UF personnel showing better savings all around. Michael Dukes, lead researcher and professor of Agricultural and Biological Engineering, said: “The original objectives were to determine if smart controllers in
Orange County could save water. We have shown that they do. Also, most of the
customers with this technology indicate they are satisfied or very satisfied
with it.”
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| Textbook soil moisture sensor installation |
Is there a difference between the savings
achieved by the soil sensor and the weather-based timer? According to researcher/graduate student Eliza Breder the smart
irrigation technologies that have site specific programming result in greater
water savings. “The soil moisture sensors with site specific programming, on
average, across all locations, are shown to apply the least amount of
irrigation over the three year study when compared to all other treatments,”
Ms. Breder said.
The Future
According to the Orlando Sentinel, Orange County Utilities
is working with the St. Johns River Water Management District to establish a
water restriction variance for homeowners installing smart irrigation devices.
What will this mean? If you have a weather-based timer or soil moisture sensor scheduling your
irrigation for you, one or two day a week restrictions no longer apply.
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| A smart irrigation technology workshop slated for September |
What else is in the works? Mr. Dukes would like to see these water
efficient devices integrated into housing developments from inception.
“Our monitoring data show average savings 12-45%
using these devices for customers that have been verified as having potential
savings,” said Mr. Dukes. “We’d like to investigate whether these devices have
water savings on a wide scale, say development wide. We are in discussions
currently to gauge builder interest in using these technologies widely.”
