The Low Down On Green Living
May 1st, 2009
The Rundown On Smart Irrigation Controllers
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In many parts of the country, we’re going to be in for a dry, dry summer this year. Huge swaths of the country are already in drought territory, and for many areas summertime doesn’t offer much hope for change.
Increasing demands on scarce water resources will almost certainly lead to lower caps on water usage (and even rationing in some areas) and/or higher water rates to stimulate conservation efforts. Many Californians are already facing the prospect of higher water rates this year - Los Angeles just announced a 15% reduction in the amount of water that a family can use before triggering higher “second tier” water rates, AND a major increase of those second tier rates as compared to last year.
Over-watering of lawns and gardens is usually one of the greatest sources of water waste. There are many reasons why: some people apply too much water, water at the wrong times thereby increasing evaporation, or don’t adjust their sprinklers and end up watering the street / driveway instead.
One of the best ways to control irrigation water use is to use “smart” irrigation controllers. They not only save you money, but they’ll save an incredible amount of hassle by taking the guesswork out of setting your irrigation schedule correctly. In many water-starved parts of the country your local water agency might offer rebates on these systems, sometimes nearly paying for the entire controller!
Smart controllers come in a couple of flavors: controllers that monitor the conditions in your yard (soil moisture, etc) and set irrigation accordingly, and controllers that base your irrigation schedule on weather data received from satellite, radio or internet feeds. Here’s a run-down on some of the best options available right now.
Weather-Based Irrigation Controllers
Cyber-Rain XCI. The Cyber-Rain XCI system hooks up to your computer and downloads weather reports from the Internet. If it’s an especially hot/sunny day, irrigation times will be increased. Cool and cloudy? Times are reduced. And if rain’s in the forecast, the XCI will stop irrigation for 24 hours. The XCI also does other cool stuff like calculating before/after savings and enabling you to develop simple zone descriptions that anyone can understand - and all via wireless connection direct to your computer. It’s a bit on the pricey side at $399, but if you have a big yard with lots of zones it’s well worth it.
Irritrol SmartDial Controllers. Irritrol SmartDial controllers adjust your irrigation based on weather conditions and evapotranspiration data from the day before, so your plants are truly getting only what they need. The data for these controllers is downloaded daily from a satellite, and you’ll probably have to spring for a data subscription (usually less than $100 / year). The cost of the entry-level six-zone controller will be around $225.
Sensor-Based Irrigation Controllers
Hunter Pro-C With Solar Sync. Hunter’s Solar Sync system nearly does it all - it measures rainfall, temperature and solar radiation, and then adjusts your irrigation schedule accordingly. It even delays your irrigation program if it detects there’s a freezing risk. The system requires three parts: The Solar Sync outdoor sensor and calculation module (purchased as a unit), and a Hunter irrigation controller such as the Pro-C. If you are starting from scratch, the entire unit should cost around $250 ($125 each for Solar Sync and Pro-C controller).
Weathermatic Smartline. The Weathermatic Smartline system along with the optional SLW On-Site Weather Station monitors temperature and rainfall and, coupled with an internal database of solar radiation in your area, will adjust your irrigation levels accordingly. The controller will set you back about $120, and the weather station another $150 or so.
All of these models have been tested under a third-party testing program of the Irrigation Association called the Smart Water Application Technologies protocal, or SWAT. You can review the individual testing reports for each of these (and more) models here.
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Comments
Brenda
May 5th, 2009 at 8:59 pm
are these water-saving irrigation systems adaptable for larger commercial systems, i.e. apartment communities?
Ann
May 6th, 2009 at 3:52 pm
In my home, I have all the bathroom and kitchen sink water and the shower water piped to trees. The trees are thriving, all of them. It’s gray water and makes all the sense in the world. Grass takes loads of water, so I have none.
Harriet
May 7th, 2009 at 4:47 am
It would be nice if gray water was legal everywhere and not so much stealth. I use big litter contaiers to collect water from tub and sink while waiting for water to get hot.
I can’t use fancy systems because my yard water source is a never ending spring with lots of sand so I have to use regular hoses and some soaker hoes and big sprinklers but don’t use any fertilizers or chemicals on lawn so my water recycles into ground water no different than what mother nature intends.
I am glad to see all the options though for people I might offer info to as a Master Gardener.
We went from exceptional drought last year, one of the absolute worst spots in the country for several years, to so wet now we have standing water in the high spots in my yard, from one extreme to the other,
Keep up the good work about water usage,
Harriet
The Zoom Ring » Blog Archive » Weekend Projects to Save Water in Your Backyard - Just another WordPress weblog
July 14th, 2009 at 4:43 am
[...] over-watering. Some states even require these sensors to be installed. Ideally, you’ll want a smart controller system that takes into account the weather, plant zones, soil types, plant needs and various other [...]
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