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| Front yard turf zone, circa 2011 |
Playing the classics
The final visit for the day was a home in Coral Gables, the
City Beautiful. In 2011, this residence had rehabilitated its potable water
irrigation system and installed a weather-based irrigation controller (WBIC). With a landscape
that features mostly palms, shrubs and decorative stones, a seven zone
irrigation system has no business at this location. In any case, the controller
installation was rebated in 2011 and the homeowner asked the team to stop by to
see if things were still on the up and up.
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| No longer on the up and up: Jesus Lomeli and a riser nozzle gone missing |
A bit about WBICs
Once we realized where we were, U.C.U. tech Jesus and I had
eyes big as saucers. Why? Two words: applied science. Weather-based irrigation controllers require very specific programming for each zone:
- soil type
- plant type
- shade factor
- sprinkler head type, etc.
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| All those factors are churning away in this little guy right here |
The WBIC model at this location uses these factors along with weather data from an
on-site weather sensor/tipping bucket rain gauge to calculate
evapotranspiration (or ET). This ET value is then used to generate run times for each zone. When a landscape is designed with hydrozones in
mind, much like this one with one turf zone and six tree or shrub zones, a
weather-based controller can really work its magic.
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| Weather sensor: perfectly located and busy doing science |
So after a quick zone by zone wet-check to look for breaks
or other problems, we dove into the controller’s “history” feature to track the watering events by date starting from January of this year.
#SIM2014
Smart irrigation month is an industry-fostered construct that
promotes outdoor water-use efficiency during the month of July, the outdoor water-use peak in the calendar year. The Irrigation Association recommends a
plethora of practices from design to technology that, if implemented, can reduce
water-use while still maintaining a healthy landscape.
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| Tree canopy shade is real: front yard turf zone in 2014 |
Better living through tech
In the best of all possible worlds the property I'm discussing here would have
no (or temporary) irrigation. There would be a colorful Florida-friendly groundcover in
the shady front area, and all the remaining ornamental areas would continue to
live off rain alone.
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| Back yard rocky expanse: wait, what... |
In this world, however, the weather-based controller was
expertly managing water-use for this landscape – irrigating the lone turf zone
regularly, and watering the other zones once a month, or once every few months.
During especially rainy stretches, the system would not run for weeks.
The takeaway
There is definitely room for improvement at this location - namely low-volume irrigation in the six tree/shrub zones - but the best decision this homeowner ever made for the landscape (and water bill) was installing a WBIC three years ago. This wasn't the first time Jesus and I had seen a weather-based controller save water
this way, but it's the most recent, and on the cusp of smart
irrigation month 2014, all the sweeter.
About the author:
Michael Gutierrez is a water resources
technician with UF/IFAS in the Ag & Bio
Engineering Dept. He tweets, blogs and
also shoots still and video media in South
Florida, Gainesville and anywhere else a
camera is handy. (image: Martha Golea)
