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The Metropolitan Water District of Southern California
Watering Index & Calculator

Many of us overwater our plants and lawns because we don't know when or how long to run the sprinklers. But now, figuring out how much water your lawn and garden really need is easy with the Watering Index and Calculator. Get started by using the calculator to create a customized watering schedule. Then use the Watering Index to easily adjust your sprinkler timer based on changes in the weather. You could save as much as 1,000 gallons a month by watering your plants only.

Watering Index