Irrigation Tips for Southern Arizona

You can save literally thousands of gallons of water on your landscape, and save your plants from drowning, just by ensuring the proper settings of your irrigation controller.

Outdoor Water Saving Tips

  1. Avoid over-watering your lawn; it can make it more susceptible to stress from high temperatures and more likely to have disease and fungus, and more weeds than lawns appropriately watered.
  2. Don't water the whole lawn for some brown spots; water those by hand or just let them be.
  3. Allow the lawn to grow taller, between 3 to 5 inches. Taller grass shades the soil, reducing evaporation and conserving moisture, and taller grass tends to have deeper roots, helping grass to survive longer periods without water.
  4. Leave grass clippings on the lawn; not only will it provide mulch and keep things cool, the clippings are a great source of free fertilizer.
  5. Apply a 3 to 4-inch layer of mulch to trees, shrubs, and flowers.
  6. Consider replacing water-loving annuals with low-water perennials.

Programming your irrigation controller:

  1. Set the current time and day and replace the back-up battery that holds the program memory.
  2. Start with program A for your lawn areas. Group stations or valves that require the same watering frequencies together on the same program.
  3. Select each station and enter the minutes of watering time for each valve.
  4. Select the time you'd like your irrigation to start. You can have 2 or 3 different start times per day. Program start times should be one or more hours apart to allow the water to soak in and prevent run-off.
  5. Select the days you want your irrigation to run, making sure you don't water on the same day you mow the lawn.
  6. Program A is complete. Use programs B & C for other zones that require less water, such as ground covers, shrubs, low water use plantings, etc.


DAYS PER WEEK: Typical irrigation controllers allow a program to be scheduled to operate any day of the week. Operation can happen on any number of selected days. Adding or subtracting days is a common way to adjust controllers for increasing or decreasing seasonal water requirements. Multiple Programs A, B, and C, allow you to run different valves on different days with different run times.

MINUTES PER STATION: Each station or valve is given a run time in minutes that is determined by the amount of time it takes for water to saturate the soil and start running off. A typical time for water to run off in clay soils with a spray system is 5 minutes. This is the maximum amount of watering time that you should apply to allow the soil to absorb the water. This is known as "Cycle and Soak". Apply water and allow time for it to soak in before applying additional required water.

START TIMES PER DAY: Each program in the controller has two to four start times depending on the model of the irrigation controller. Repeated start times allows for the "Cycle and Soak" principle by giving time for the water to be absorbed into the soil and thereby avoid run-off . If we need 10 minutes of watering, per day, then we would use two start times one hour apart with a 5 minute station run time each. Start times for different programs should not conflict with each other.

TOTAL MINUTES PER WEEK: We assume the irrigation system is well designed and maintained. Your individual irrigation system may apply water faster or slower based on the design, type and spacing of sprinkler heads. Also, significant differences in temperatures can occur throughout the year that are out of the monthly averages. For these reasons YOU MAY HAVE TO ADJUST UP OR DOWN to meet the watering needs of your lawns and landscaping.