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You've probably seen this happen: it's raining, yet the sprinklers are working hard in a city park. Not such a smart idea in a drought, or anytime actually. This past week, new sprinkler regulations went into affect (.pdf info sheet), only allowing sprinkling use on Mondays and Thursdays and not between the times of 9 a.m. and 4 p.m. For a few years now, there's been a more advanced sprinkler that knows the weather so if it's raining, it knows not to turn on. The Isla Earth podcast from the Catalina Island Conservancy explained in an older episode:
The Environmental Protection Agency agrees and allows some companies to use their WaterSense logo, a similar program to EnergyStar prodcts.. "These new control technologies offer significant potential to improve irrigation practices," they say.