Water Efficient Irrigation
Plants come in four categories – high, moderate, low and very low water use – and the recommended watering times are different for each category.
Two Scheduling Tools
If you have an older irrigation controller, you need to enter the correct watering times yourself and you can get them with the city of San Diego’s Landscape Watering Calculator.
Our sprinklers put a lot of water on our landscapes, but only a percentage of it is absorbed into the soil and into the roots of our grass, plants and trees. The higher the percentage, the more efficient the sprinkler is.
Spray nozzles are very common but have two issues: they apply water faster than most soils can absorb it, and wind can blow the small water drops off target — causing water to run on to sidewalks and into the street.
Rotary nozzles apply water slowly and produce large, wind-resistant water drops. They can be up to 30 percent more efficient than spray nozzles and are the best choice for watering a lawn. Replacing spray nozzles with rotary nozzles is simple – watch our video.
Drip irrigation applies water slower and deeper into the soil, and is the best way to water plants and trees. Not irrigating the area between plants saves a lot of water and reduces weeds, and installation is easy – watch this video.
If your sprinklers apply water faster than your soil can absorb it, water will run off of your landscape, on to the sidewalk and into the street. You can avoid runoff by using rotary nozzles and drip irrigation, or by reducing your watering times and watering more often.
Use Multiple Start Times
On Start Time 1 or Program A:
Schedule the same days and 3:00 minutes at 12:00am
On Start Time 2 or Program B:
Schedule the same days and 3:00 minutes at 2:30am
On Start Time 3 or Program C:
Schedule the same days and 4:00 minutes at 5:00am
Use the Cycle and Soak Option
The optimal water pressure for drip irrigation and sprinklers ranges from 20-40 psi. But a home’s water pressure can be as high as 70 psi.
GALLONS WASTED BY ONE SPRINKLER IN 10 MINUTES
GALLONS WASTED BY 60 SPRINKLERS IN 10 MINUTES
GALLONS WASTED BY 60 SPRINKLERS IN ONE YEAR