Irrigation Efficiency

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Scheduling / Sprinkler Tune-up / ET Data

Most irrigation controllers have a percentage adjustment feature. Adjust this setting to the irrigation percent number shown in the table below in the blue box. Do this at least once a week.

If you do not know how:

  • Go to the manufacturer's website.
  • Call us at (818) 251-2100 and ask for a Conservation staff member. 
Smart Controller 

Read our Simple Irrigation Scheduler brochure for helpful tips on establishing a water schedule. For a more detailed explanation, read our Optimal Irrigation Scheduler brochure.

Improve your sprinkler system's performance using this Sprinkler System Tune-up Tutorial.

Evapotranspiration (also known as ET) information is provided by the district to help you with irrigation scheduling. This information is gathered from the district weather stations located in the City of Westlake Village at the Las Virgenes Reservoir.

ET is a measure of the water needs of landscape. ET indicates the amount of water used by plants when they are well watered, and thus shows the quantity of water we need to return to the soil.

By adjusting irrigation cycles according to ET, you can assure that your plants are receiving sufficient water without overwatering—for healthier plants and lower water costs.


The ET values for Thursday, December 13, 2018 were

LVMWD Service Area







e = an estimated value.

Historical ET Values for 2017
(provided in PDF format)

January February March April May June
July August September October November December


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